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1460 lines
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<i class="fa fa-check"></i> <b>1.</b> 欢迎使用 Swift
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<i class="fa fa-check"></i> <b>1.1.</b> 关于 Swift
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<i class="fa fa-check"></i> <b>1.2.</b> Swift 初见
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<i class="fa fa-check"></i> <b>2.</b> Swift 教程
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<i class="fa fa-check"></i> <b>2.1.</b> 基础部分
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<a href="../chapter2/02_Basic_Operators.html">
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<i class="fa fa-check"></i> <b>2.2.</b> 基本运算符
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<a href="../chapter2/03_Strings_and_Characters.html">
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<i class="fa fa-check"></i> <b>2.3.</b> 字符串和字符
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<i class="fa fa-check"></i> <b>2.4.</b> 集合类型
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</a>
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<li class="chapter " data-level="2.5" data-path="chapter2/05_Control_Flow.html">
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<a href="../chapter2/05_Control_Flow.html">
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<i class="fa fa-check"></i> <b>2.5.</b> 控制流
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</a>
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<li class="chapter " data-level="2.6" data-path="chapter2/06_Functions.html">
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<a href="../chapter2/06_Functions.html">
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<i class="fa fa-check"></i> <b>2.6.</b> 函数
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</a>
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<li class="chapter " data-level="2.7" data-path="chapter2/07_Closures.html">
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<a href="../chapter2/07_Closures.html">
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<i class="fa fa-check"></i> <b>2.7.</b> 闭包
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</a>
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<li class="chapter " data-level="2.8" data-path="chapter2/08_Enumerations.html">
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<a href="../chapter2/08_Enumerations.html">
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<i class="fa fa-check"></i> <b>2.8.</b> 枚举
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</a>
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<li class="chapter " data-level="2.9" data-path="chapter2/09_Classes_and_Structures.html">
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<a href="../chapter2/09_Classes_and_Structures.html">
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<i class="fa fa-check"></i> <b>2.9.</b> 类和结构体
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</a>
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</li>
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<li class="chapter " data-level="2.10" data-path="chapter2/10_Properties.html">
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<a href="../chapter2/10_Properties.html">
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<i class="fa fa-check"></i> <b>2.10.</b> 属性
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</a>
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</li>
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<li class="chapter " data-level="2.11" data-path="chapter2/11_Methods.html">
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<a href="../chapter2/11_Methods.html">
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<i class="fa fa-check"></i> <b>2.11.</b> 方法
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</a>
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</li>
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<li class="chapter " data-level="2.12" data-path="chapter2/12_Subscripts.html">
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<a href="../chapter2/12_Subscripts.html">
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<i class="fa fa-check"></i> <b>2.12.</b> 附属脚本
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</a>
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</li>
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<li class="chapter " data-level="2.13" data-path="chapter2/13_Inheritance.html">
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<a href="../chapter2/13_Inheritance.html">
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<i class="fa fa-check"></i> <b>2.13.</b> 继承
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</a>
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</li>
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<li class="chapter " data-level="2.14" data-path="chapter2/14_Initialization.html">
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<a href="../chapter2/14_Initialization.html">
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<i class="fa fa-check"></i> <b>2.14.</b> 构造过程
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</a>
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</li>
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<li class="chapter " data-level="2.15" data-path="chapter2/15_Deinitialization.html">
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<a href="../chapter2/15_Deinitialization.html">
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<i class="fa fa-check"></i> <b>2.15.</b> 析构过程
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</a>
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</li>
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<li class="chapter " data-level="2.16" data-path="chapter2/16_Automatic_Reference_Counting.html">
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<a href="../chapter2/16_Automatic_Reference_Counting.html">
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<i class="fa fa-check"></i> <b>2.16.</b> 自动引用计数
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</a>
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</li>
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<li class="chapter " data-level="2.17" data-path="chapter2/17_Optional_Chaining.html">
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<a href="../chapter2/17_Optional_Chaining.html">
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<i class="fa fa-check"></i> <b>2.17.</b> 可选链
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||
</a>
|
||
|
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</li>
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<li class="chapter " data-level="2.18" data-path="chapter2/18_Type_Casting.html">
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<a href="../chapter2/18_Type_Casting.html">
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<i class="fa fa-check"></i> <b>2.18.</b> 类型检查
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</a>
|
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|
||
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</li>
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|
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<li class="chapter " data-level="2.19" data-path="chapter2/19_Nested_Types.html">
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<a href="../chapter2/19_Nested_Types.html">
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<i class="fa fa-check"></i> <b>2.19.</b> 类型嵌套
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||
</a>
|
||
|
||
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||
</li>
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|
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<li class="chapter " data-level="2.20" data-path="chapter2/20_Extensions.html">
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<a href="../chapter2/20_Extensions.html">
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<i class="fa fa-check"></i> <b>2.20.</b> 扩展
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
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<li class="chapter " data-level="2.21" data-path="chapter2/21_Protocols.html">
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|
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<a href="../chapter2/21_Protocols.html">
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<i class="fa fa-check"></i> <b>2.21.</b> 协议
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||
</a>
|
||
|
||
|
||
</li>
|
||
|
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<li class="chapter " data-level="2.22" data-path="chapter2/22_Generics.html">
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|
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<a href="../chapter2/22_Generics.html">
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<i class="fa fa-check"></i> <b>2.22.</b> 泛型
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
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<li class="chapter " data-level="2.23" data-path="chapter2/23_Advanced_Operators.html">
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|
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<a href="../chapter2/23_Advanced_Operators.html">
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<i class="fa fa-check"></i> <b>2.23.</b> 高级操作符
|
||
</a>
|
||
|
||
|
||
</li>
|
||
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</ul>
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</li>
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<li class="chapter " data-level="3" data-path="chapter3/chapter3.html">
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<a href="../chapter3/chapter3.html">
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<i class="fa fa-check"></i> <b>3.</b> 语言参考
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.1" data-path="chapter3/01_About_the_Language_Reference.html">
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<a href="../chapter3/01_About_the_Language_Reference.html">
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<i class="fa fa-check"></i> <b>3.1.</b> 关于语言参考
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</a>
|
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</li>
|
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<li class="chapter " data-level="3.2" data-path="chapter3/02_Lexical_Structure.html">
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<a href="../chapter3/02_Lexical_Structure.html">
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<i class="fa fa-check"></i> <b>3.2.</b> 词法结构
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</a>
|
||
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</li>
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<li class="chapter " data-level="3.3" data-path="chapter3/03_Types.html">
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<a href="../chapter3/03_Types.html">
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<i class="fa fa-check"></i> <b>3.3.</b> 类型
|
||
</a>
|
||
|
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</li>
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|
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<li class="chapter " data-level="3.4" data-path="chapter3/04_Expressions.html">
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<a href="../chapter3/04_Expressions.html">
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<i class="fa fa-check"></i> <b>3.4.</b> 表达式
|
||
</a>
|
||
|
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|
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</li>
|
||
|
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<li class="chapter " data-level="3.5" data-path="chapter3/10_Statements.html">
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<a href="../chapter3/10_Statements.html">
|
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<i class="fa fa-check"></i> <b>3.5.</b> 语句
|
||
</a>
|
||
|
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|
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</li>
|
||
|
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<li class="chapter " data-level="3.6" data-path="chapter3/05_Declarations.html">
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|
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<a href="../chapter3/05_Declarations.html">
|
||
<i class="fa fa-check"></i> <b>3.6.</b> 声明
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
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<li class="chapter " data-level="3.7" data-path="chapter3/06_Attributes.html">
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<a href="../chapter3/06_Attributes.html">
|
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<i class="fa fa-check"></i> <b>3.7.</b> 特性
|
||
</a>
|
||
|
||
|
||
</li>
|
||
|
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<li class="chapter " data-level="3.8" data-path="chapter3/07_Patterns.html">
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|
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<a href="../chapter3/07_Patterns.html">
|
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<i class="fa fa-check"></i> <b>3.8.</b> 模式
|
||
</a>
|
||
|
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|
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</li>
|
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|
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<li class="chapter " data-level="3.9" data-path="chapter3/08_Generic_Parameters_and_Arguments.html">
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<a href="../chapter3/08_Generic_Parameters_and_Arguments.html">
|
||
<i class="fa fa-check"></i> <b>3.9.</b> 泛型参数
|
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</a>
|
||
|
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|
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</li>
|
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|
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<li class="chapter " data-level="3.10" data-path="chapter3/09_Summary_of_the_Grammar.html">
|
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|
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<a href="../chapter3/09_Summary_of_the_Grammar.html">
|
||
<i class="fa fa-check"></i> <b>3.10.</b> 语法总结
|
||
</a>
|
||
|
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|
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</li>
|
||
|
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|
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</ul>
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|
||
<a href="../chapter1/02_a_swift_tour.html" title="Swift 初见" class="chapter done " data-progress="1.2" style="left: 7.894736842105263%;"></a>
|
||
|
||
<a href="../chapter2/chapter2.html" title="Swift 教程" class="chapter done new-chapter" data-progress="2" style="left: 10.526315789473685%;"></a>
|
||
|
||
<a href="../chapter2/01_The_Basics.html" title="基础部分" class="chapter done " data-progress="2.1" style="left: 13.157894736842104%;"></a>
|
||
|
||
<a href="../chapter2/10_Properties.html" title="属性" class="chapter done " data-progress="2.10" style="left: 15.789473684210526%;"></a>
|
||
|
||
<a href="../chapter2/11_Methods.html" title="方法" class="chapter done " data-progress="2.11" style="left: 18.42105263157895%;"></a>
|
||
|
||
<a href="../chapter2/12_Subscripts.html" title="附属脚本" class="chapter done " data-progress="2.12" style="left: 21.05263157894737%;"></a>
|
||
|
||
<a href="../chapter2/13_Inheritance.html" title="继承" class="chapter done " data-progress="2.13" style="left: 23.68421052631579%;"></a>
|
||
|
||
<a href="../chapter2/14_Initialization.html" title="构造过程" class="chapter done " data-progress="2.14" style="left: 26.31578947368421%;"></a>
|
||
|
||
<a href="../chapter2/15_Deinitialization.html" title="析构过程" class="chapter done " data-progress="2.15" style="left: 28.94736842105263%;"></a>
|
||
|
||
<a href="../chapter2/16_Automatic_Reference_Counting.html" title="自动引用计数" class="chapter done " data-progress="2.16" style="left: 31.57894736842105%;"></a>
|
||
|
||
<a href="../chapter2/17_Optional_Chaining.html" title="可选链" class="chapter done " data-progress="2.17" style="left: 34.21052631578947%;"></a>
|
||
|
||
<a href="../chapter2/18_Type_Casting.html" title="类型检查" class="chapter done " data-progress="2.18" style="left: 36.8421052631579%;"></a>
|
||
|
||
<a href="../chapter2/19_Nested_Types.html" title="类型嵌套" class="chapter done " data-progress="2.19" style="left: 39.473684210526315%;"></a>
|
||
|
||
<a href="../chapter2/02_Basic_Operators.html" title="基本运算符" class="chapter done " data-progress="2.2" style="left: 42.10526315789474%;"></a>
|
||
|
||
<a href="../chapter2/20_Extensions.html" title="扩展" class="chapter done " data-progress="2.20" style="left: 44.73684210526316%;"></a>
|
||
|
||
<a href="../chapter2/21_Protocols.html" title="协议" class="chapter done " data-progress="2.21" style="left: 47.36842105263158%;"></a>
|
||
|
||
<a href="../chapter2/22_Generics.html" title="泛型" class="chapter done " data-progress="2.22" style="left: 50%;"></a>
|
||
|
||
<a href="../chapter2/23_Advanced_Operators.html" title="高级操作符" class="chapter done " data-progress="2.23" style="left: 52.63157894736842%;"></a>
|
||
|
||
<a href="../chapter2/03_Strings_and_Characters.html" title="字符串和字符" class="chapter done " data-progress="2.3" style="left: 55.26315789473684%;"></a>
|
||
|
||
<a href="../chapter2/04_Collection_Types.html" title="集合类型" class="chapter done " data-progress="2.4" style="left: 57.89473684210526%;"></a>
|
||
|
||
<a href="../chapter2/05_Control_Flow.html" title="控制流" class="chapter done " data-progress="2.5" style="left: 60.526315789473685%;"></a>
|
||
|
||
<a href="../chapter2/06_Functions.html" title="函数" class="chapter done " data-progress="2.6" style="left: 63.1578947368421%;"></a>
|
||
|
||
<a href="../chapter2/07_Closures.html" title="闭包" class="chapter done " data-progress="2.7" style="left: 65.78947368421052%;"></a>
|
||
|
||
<a href="../chapter2/08_Enumerations.html" title="枚举" class="chapter done " data-progress="2.8" style="left: 68.42105263157895%;"></a>
|
||
|
||
<a href="../chapter2/09_Classes_and_Structures.html" title="类和结构体" class="chapter done " data-progress="2.9" style="left: 71.05263157894737%;"></a>
|
||
|
||
<a href="../chapter3/chapter3.html" title="语言参考" class="chapter done new-chapter" data-progress="3" style="left: 73.6842105263158%;"></a>
|
||
|
||
<a href="../chapter3/01_About_the_Language_Reference.html" title="关于语言参考" class="chapter done " data-progress="3.1" style="left: 76.3157894736842%;"></a>
|
||
|
||
<a href="../chapter3/09_Summary_of_the_Grammar.html" title="语法总结" class="chapter done " data-progress="3.10" style="left: 78.94736842105263%;"></a>
|
||
|
||
<a href="../chapter3/02_Lexical_Structure.html" title="词法结构" class="chapter " data-progress="3.2" style="left: 81.57894736842105%;"></a>
|
||
|
||
<a href="../chapter3/03_Types.html" title="类型" class="chapter " data-progress="3.3" style="left: 84.21052631578948%;"></a>
|
||
|
||
<a href="../chapter3/04_Expressions.html" title="表达式" class="chapter " data-progress="3.4" style="left: 86.84210526315789%;"></a>
|
||
|
||
<a href="../chapter3/10_Statements.html" title="语句" class="chapter " data-progress="3.5" style="left: 89.47368421052632%;"></a>
|
||
|
||
<a href="../chapter3/05_Declarations.html" title="声明" class="chapter " data-progress="3.6" style="left: 92.10526315789474%;"></a>
|
||
|
||
<a href="../chapter3/06_Attributes.html" title="特性" class="chapter " data-progress="3.7" style="left: 94.73684210526316%;"></a>
|
||
|
||
<a href="../chapter3/07_Patterns.html" title="模式" class="chapter " data-progress="3.8" style="left: 97.36842105263158%;"></a>
|
||
|
||
<a href="../chapter3/08_Generic_Parameters_and_Arguments.html" title="泛型参数" class="chapter " data-progress="3.9" style="left: 100%;"></a>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
<div class="page-inner">
|
||
|
||
<section class="normal" id="section-gitbook_6533">
|
||
|
||
<blockquote>
|
||
<p>翻译：StanZhai</p>
|
||
<p>校对：xielingwang</p>
|
||
</blockquote>
|
||
<h1 id="-">语法总结</h1>
|
||
<hr>
|
||
<p>本页包含内容：</p>
|
||
<ul>
|
||
<li><a href="#statements">语句（Statements）</a></li>
|
||
<li><a href="#generic_parameters_and_arguments">泛型参数（Generic Parameters and Arguments）</a></li>
|
||
<li><a href="#declarations">声明（Declarations）</a></li>
|
||
<li><a href="#patterns">模式（Patterns）</a></li>
|
||
<li><a href="#attributes">特性（Attributes）</a></li>
|
||
<li><a href="#expressions">表达式（Expressions）</a></li>
|
||
<li><a href="#lexical_structure">词法结构（Lexical Structure）</a></li>
|
||
<li><a href="#types">类型（Types）</a></li>
|
||
</ul>
|
||
<p><a name="statements"></a></p>
|
||
<h2 id="-">语句</h2>
|
||
<blockquote>
|
||
<p>语句语法
|
||
<em>statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> <strong>;</strong> <em>opt</em>
|
||
<em>statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/declaration" target="_blank"><em>declaration</em></a> <strong>;</strong> <em>opt</em>
|
||
<em>statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/loop-statement" target="_blank"><em>loop-statement</em></a> <strong>;</strong> <em>opt</em>
|
||
<em>statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/branch-statement" target="_blank"><em>branch-statement</em></a> <strong>;</strong> <em>opt</em>
|
||
<em>statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/labeled-statement" target="_blank"><em>labeled-statement</em></a>
|
||
<em>statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/control-transfer-statement" target="_blank"><em>control-transfer-statement</em></a> <strong>;</strong> <em>opt</em>
|
||
<em>statements</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/statement" target="_blank"><em>statement</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/statements" target="_blank"><em>statements</em></a> <em>opt</em></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>循环语句语法
|
||
<em>loop-statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/for-statement" target="_blank"><em>for-statement</em></a>
|
||
<em>loop-statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/for-in-statement" target="_blank"><em>for-in-statement</em></a>
|
||
<em>loop-statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/wheetatype类型ile-statement" target="_blank"><em>while-statement</em></a>
|
||
<em>loop-statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/do-while-statement" target="_blank"><em>do-while-statement</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>For 循环语法
|
||
<em>for-statement</em> → <strong>for</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/for-init" target="_blank"><em>for-init</em></a> <em>opt</em> <strong>;</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> <em>opt</em> <strong>;</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/code-block" target="_blank"><em>code-block</em></a>
|
||
<em>for-statement</em> → <strong>for</strong> <strong>(</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/for-init" target="_blank"><em>for-init</em></a> <em>opt</em> <strong>;</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> <em>opt</em> <strong>;</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> <em>opt</em> <strong>)</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/code-block" target="_blank"><em>code-block</em></a>
|
||
<em>for-init</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/variable-declaration" target="_blank"><em>variable-declaration</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression-list" target="_blank"><em>expression-list</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>For-In 循环语法
|
||
<em>for-in-statement</em> → <strong>for</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/pattern" target="_blank"><em>pattern</em></a> <strong>in</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/code-block" target="_blank"><em>code-block</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>While 循环语法
|
||
<em>while-statement</em> → <strong>while</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/while-condition" target="_blank"><em>while-condition</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/code-block" target="_blank"><em>code-block</em></a>
|
||
<em>while-condition</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/declaration" target="_blank"><em>declaration</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>Do-While 循环语法
|
||
<em>do-while-statement</em> → <strong>do</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/code-block" target="_blank"><em>code-block</em></a> <strong>while</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/while-condition" target="_blank"><em>while-condition</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>分支语句语法
|
||
<em>branch-statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/if-statement" target="_blank"><em>if-statement</em></a>
|
||
<em>branch-statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/switch-statement" target="_blank"><em>switch-statement</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>If 语句语法
|
||
<em>if-statement</em> → <strong>if</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/if-condition" target="_blank"><em>if-condition</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/code-block" target="_blank"><em>code-block</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/else-clause" target="_blank"><em>else-clause</em></a> <em>opt</em>
|
||
<em>if-condition</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/declaration" target="_blank"><em>declaration</em></a>
|
||
<em>else-clause</em> → <strong>else</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/code-block" target="_blank"><em>code-block</em></a> | <strong>else</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/if-statement" target="_blank"><em>if-statement</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>Switch 语句语法
|
||
<em>switch-statement</em> → <strong>switch</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/switch-cases" target="_blank"><em>switch-cases</em></a> <em>opt</em> <strong>}</strong>
|
||
<em>switch-cases</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/switch-case" target="_blank"><em>switch-case</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/switch-cases" target="_blank"><em>switch-cases</em></a> <em>opt</em>
|
||
<em>switch-case</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/case-label" target="_blank"><em>case-label</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/statements" target="_blank"><em>statements</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/default-label" target="_blank"><em>default-label</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/statements" target="_blank"><em>statements</em></a>
|
||
<em>switch-case</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/case-label" target="_blank"><em>case-label</em></a> <strong>;</strong> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/default-label" target="_blank"><em>default-label</em></a> <strong>;</strong>
|
||
<em>case-label</em> → <strong>case</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/case-item-list" target="_blank"><em>case-item-list</em></a> <strong>:</strong>
|
||
<em>case-item-list</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/pattern" target="_blank"><em>pattern</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/guard-clause" target="_blank"><em>guard-clause</em></a> <em>opt</em> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/pattern" target="_blank"><em>pattern</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/guard-clause" target="_blank"><em>guard-clause</em></a> <em>opt</em> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/case-item-list" target="_blank"><em>case-item-list</em></a>
|
||
<em>default-label</em> → <strong>default</strong> <strong>:</strong>
|
||
<em>guard-clause</em> → <strong>where</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/guard-expression" target="_blank"><em>guard-expression</em></a>
|
||
<em>guard-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>带标签的语句语法
|
||
<em>labeled-statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/statement-label" target="_blank"><em>statement-label</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/loop-statement" target="_blank"><em>loop-statement</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/statement-label" target="_blank"><em>statement-label</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/switch-statement" target="_blank"><em>switch-statement</em></a>
|
||
<em>statement-label</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/label-name" target="_blank"><em>label-name</em></a> <strong>:</strong>
|
||
<em>label-name</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>控制传递语句语法
|
||
<em>control-transfer-statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/break-statement" target="_blank"><em>break-statement</em></a>
|
||
<em>control-transfer-statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/continue-statement" target="_blank"><em>continue-statement</em></a>
|
||
<em>control-transfer-statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/fallthrough-statement" target="_blank"><em>fallthrough-statement</em></a>
|
||
<em>control-transfer-statement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/return-statement" target="_blank"><em>return-statement</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>Break 语句语法
|
||
<em>break-statement</em> → <strong>break</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/label-name" target="_blank"><em>label-name</em></a> <em>opt</em></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>Continue 语句语法
|
||
<em>continue-statement</em> → <strong>continue</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/label-name" target="_blank"><em>label-name</em></a> <em>opt</em></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>Fallthrough 语句语法
|
||
<em>fallthrough-statement</em> → <strong>fallthrough</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>Return 语句语法
|
||
<em>return-statement</em> → <strong>return</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> <em>opt</em></p>
|
||
</blockquote>
|
||
<p><a name="generic_parameters_and_arguments"></a></p>
|
||
<h2 id="-">泛型参数</h2>
|
||
<blockquote>
|
||
<p>泛型形参子句语法
|
||
<em>generic-parameter-clause</em> → <strong><</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-parameter-list" target="_blank"><em>generic-parameter-list</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/requirement-clause" target="_blank"><em>requirement-clause</em></a> <em>opt</em> <strong>></strong>
|
||
<em>generic-parameter-list</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-parameter" target="_blank"><em>generic-parameter</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-parameter" target="_blank"><em>generic-parameter</em></a> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-parameter-list" target="_blank"><em>generic-parameter-list</em></a>
|
||
<em>generic-parameter</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-name" target="_blank"><em>type-name</em></a>
|
||
<em>generic-parameter</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-name" target="_blank"><em>type-name</em></a> <strong>:</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-identifier" target="_blank"><em>type-identifier</em></a>
|
||
<em>generic-parameter</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-name" target="_blank"><em>type-name</em></a> <strong>:</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/protocol-composition-type" target="_blank"><em>protocol-composition-type</em></a>
|
||
<em>requirement-clause</em> → <strong>where</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/requirement-list" target="_blank"><em>requirement-list</em></a>
|
||
<em>requirement-list</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/requirement" target="_blank"><em>requirement</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/requirement" target="_blank"><em>requirement</em></a> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/requirement-list" target="_blank"><em>requirement-list</em></a>
|
||
<em>requirement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/conformance-requirement" target="_blank"><em>conformance-requirement</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/same-type-requirement" target="_blank"><em>same-type-requirement</em></a>
|
||
<em>conformance-requirement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-identifier" target="_blank"><em>type-identifier</em></a> <strong>:</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-identifier" target="_blank"><em>type-identifier</em></a>
|
||
<em>conformance-requirement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-identifier" target="_blank"><em>type-identifier</em></a> <strong>:</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/protocol-composition-type" target="_blank"><em>protocol-composition-type</em></a>
|
||
<em>same-type-requirement</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-identifier" target="_blank"><em>type-identifier</em></a> <strong>==</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-identifier" target="_blank"><em>type-identifier</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>泛型实参子句语法
|
||
<em>generic-argument-clause</em> → <strong><</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-argument-list" target="_blank"><em>generic-argument-list</em></a> <strong>></strong>
|
||
<em>generic-argument-list</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-argument" target="_blank"><em>generic-argument</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-argument" target="_blank"><em>generic-argument</em></a> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-argument-list" target="_blank"><em>generic-argument-list</em></a>
|
||
<em>generic-argument</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a></p>
|
||
</blockquote>
|
||
<p><a name="declarations"></a></p>
|
||
<h2 id="-declarations-">声明 (Declarations)</h2>
|
||
<blockquote>
|
||
<p>声明语法
|
||
<em>declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/import-declaration" target="_blank"><em>import-declaration</em></a>
|
||
<em>declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/constant-declaration" target="_blank"><em>constant-declaration</em></a>
|
||
<em>declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/variable-declaration" target="_blank"><em>variable-declaration</em></a>
|
||
<em>declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/typealias-declaration" target="_blank"><em>typealias-declaration</em></a>
|
||
<em>declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/function-declaration" target="_blank"><em>function-declaration</em></a>
|
||
<em>declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/enum-declaration" target="_blank"><em>enum-declaration</em></a>
|
||
<em>declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/struct-declaration" target="_blank"><em>struct-declaration</em></a>
|
||
<em>declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/class-declaration" target="_blank"><em>class-declaration</em></a>
|
||
<em>declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/protocol-declaration" target="_blank"><em>protocol-declaration</em></a>
|
||
<em>declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/initializer-declaration" target="_blank"><em>initializer-declaration</em></a>
|
||
<em>declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/deinitializer-declaration" target="_blank"><em>deinitializer-declaration</em></a>
|
||
<em>declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/extension-declaration" target="_blank"><em>extension-declaration</em></a>
|
||
<em>declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/subscript-declaration" target="_blank"><em>subscript-declaration</em></a>
|
||
<em>declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/operator-declaration" target="_blank"><em>operator-declaration</em></a>
|
||
<em>declarations</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/declaration" target="_blank"><em>declaration</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/declarations" target="_blank"><em>declarations</em></a> <em>opt</em>
|
||
<em>declaration-specifiers</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/declaration-specifier" target="_blank"><em>declaration-specifier</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/declaration-specifiers" target="_blank"><em>declaration-specifiers</em></a> <em>opt</em>
|
||
<em>declaration-specifier</em> → <strong>class</strong> | <strong>mutating</strong> | <strong>nonmutating</strong> | <strong>override</strong> | <strong>static</strong> | <strong>unowned</strong> | <strong>unowned(safe)</strong> | <strong>unowned(unsafe)</strong> | <strong>weak</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>顶级声明语法
|
||
<em>top-level-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/statements" target="_blank"><em>statements</em></a> <em>opt</em></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>代码块语法
|
||
<em>code-block</em> → <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/statements" target="_blank"><em>statements</em></a> <em>opt</em> <strong>}</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>Import 声明语法
|
||
<em>import-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <strong>import</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/import-kind" target="_blank"><em>import-kind</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/import-path" target="_blank"><em>import-path</em></a>
|
||
<em>import-kind</em> → <strong>typealias</strong> | <strong>struct</strong> | <strong>class</strong> | <strong>enum</strong> | <strong>protocol</strong> | <strong>var</strong> | <strong>func</strong>
|
||
<em>import-path</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/import-path-identifier" target="_blank"><em>import-path-identifier</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/import-path-identifier" target="_blank"><em>import-path-identifier</em></a> <strong>.</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/import-path" target="_blank"><em>import-path</em></a>
|
||
<em>import-path-identifier</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/operator" target="_blank"><em>operator</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>常数声明语法
|
||
<em>constant-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/declaration-specifiers" target="_blank"><em>declaration-specifiers</em></a> <em>opt</em> <strong>let</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/pattern-initializer-list" target="_blank"><em>pattern-initializer-list</em></a>
|
||
<em>pattern-initializer-list</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/pattern-initializer" target="_blank"><em>pattern-initializer</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/pattern-initializer" target="_blank"><em>pattern-initializer</em></a> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/pattern-initializer-list" target="_blank"><em>pattern-initializer-list</em></a>
|
||
<em>pattern-initializer</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/pattern" target="_blank"><em>pattern</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/initializer" target="_blank"><em>initializer</em></a> <em>opt</em>
|
||
<em>initializer</em> → <strong>=</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>变量声明语法
|
||
<em>variable-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/variable-declaration-head" target="_blank"><em>variable-declaration-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/pattern-initializer-list" target="_blank"><em>pattern-initializer-list</em></a>
|
||
<em>variable-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/variable-declaration-head" target="_blank"><em>variable-declaration-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/variable-name" target="_blank"><em>variable-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-annotation" target="_blank"><em>type-annotation</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/code-block" target="_blank"><em>code-block</em></a>
|
||
<em>variable-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/variable-declaration-head" target="_blank"><em>variable-declaration-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/variable-name" target="_blank"><em>variable-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-annotation" target="_blank"><em>type-annotation</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-setter-block" target="_blank"><em>getter-setter-block</em></a>
|
||
<em>variable-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/variable-declaration-head" target="_blank"><em>variable-declaration-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/variable-name" target="_blank"><em>variable-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-annotation" target="_blank"><em>type-annotation</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-setter-keyword-block" target="_blank"><em>getter-setter-keyword-block</em></a>
|
||
<em>variable-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/variable-declaration-head" target="_blank"><em>variable-declaration-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/variable-name" target="_blank"><em>variable-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-annotation" target="_blank"><em>type-annotation</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/initializer" target="_blank"><em>initializer</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/willSet-didSet-block" target="_blank"><em>willSet-didSet-block</em></a>
|
||
<em>variable-declaration-head</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/declaration-specifiers" target="_blank"><em>declaration-specifiers</em></a> <em>opt</em> <strong>var</strong>
|
||
<em>variable-name</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a>
|
||
<em>getter-setter-block</em> → <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause" target="_blank"><em>getter-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause" target="_blank"><em>setter-clause</em></a> <em>opt</em> <strong>}</strong>
|
||
<em>getter-setter-block</em> → <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause" target="_blank"><em>setter-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause" target="_blank"><em>getter-clause</em></a> <strong>}</strong>
|
||
<em>getter-clause</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <strong>get</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/code-block" target="_blank"><em>code-block</em></a>
|
||
<em>setter-clause</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <strong>set</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-name" target="_blank"><em>setter-name</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/code-block" target="_blank"><em>code-block</em></a>
|
||
<em>setter-name</em> → <strong>(</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a> <strong>)</strong>
|
||
<em>getter-setter-keyword-block</em> → <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-keyword-clause" target="_blank"><em>getter-keyword-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-keyword-clause" target="_blank"><em>setter-keyword-clause</em></a> <em>opt</em> <strong>}</strong>
|
||
<em>getter-setter-keyword-block</em> → <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-keyword-clause" target="_blank"><em>setter-keyword-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-keyword-clause" target="_blank"><em>getter-keyword-clause</em></a> <strong>}</strong>
|
||
<em>getter-keyword-clause</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <strong>get</strong>
|
||
<em>setter-keyword-clause</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <strong>set</strong>
|
||
<em>willSet-didSet-block</em> → <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/willSet-clause" target="_blank"><em>willSet-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/didSet-clause" target="_blank"><em>didSet-clause</em></a> <em>opt</em> <strong>}</strong>
|
||
<em>willSet-didSet-block</em> → <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/didSet-clause" target="_blank"><em>didSet-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/willSet-clause" target="_blank"><em>willSet-clause</em></a> <strong>}</strong>
|
||
<em>willSet-clause</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <strong>willSet</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-name" target="_blank"><em>setter-name</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/code-block" target="_blank"><em>code-block</em></a>
|
||
<em>didSet-clause</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <strong>didSet</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-name" target="_blank"><em>setter-name</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/code-block" target="_blank"><em>code-block</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>类型别名声明语法
|
||
<em>typealias-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/typealias-head" target="_blank"><em>typealias-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/typealias-assignment" target="_blank"><em>typealias-assignment</em></a>
|
||
<em>typealias-head</em> → <strong>typealias</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/typealias-name" target="_blank"><em>typealias-name</em></a>
|
||
<em>typealias-name</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a>
|
||
<em>typealias-assignment</em> → <strong>=</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>函数声明语法
|
||
<em>function-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/function-head" target="_blank"><em>function-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/function-name" target="_blank"><em>function-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-parameter-clause" target="_blank"><em>generic-parameter-clause</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/function-signature" target="_blank"><em>function-signature</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/function-body" target="_blank"><em>function-body</em></a>
|
||
<em>function-head</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/declaration-specifiers" target="_blank"><em>declaration-specifiers</em></a> <em>opt</em> <strong>func</strong>
|
||
<em>function-name</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/operator" target="_blank"><em>operator</em></a>
|
||
<em>function-signature</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/parameter-clauses" target="_blank"><em>parameter-clauses</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/function-result" target="_blank"><em>function-result</em></a> <em>opt</em>
|
||
<em>function-result</em> → <strong>-></strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a>
|
||
<em>function-body</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/code-block" target="_blank"><em>code-block</em></a>
|
||
<em>parameter-clauses</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/parameter-clause" target="_blank"><em>parameter-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/parameter-clauses" target="_blank"><em>parameter-clauses</em></a> <em>opt</em>
|
||
<em>parameter-clause</em> → <strong>(</strong> <strong>)</strong> | <strong>(</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/parameter-list" target="_blank"><em>parameter-list</em></a> <strong>...</strong> <em>opt</em> <strong>)</strong>
|
||
<em>parameter-list</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/parameter" target="_blank"><em>parameter</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/parameter" target="_blank"><em>parameter</em></a> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/parameter-list" target="_blank"><em>parameter-list</em></a>
|
||
<em>parameter</em> → <strong>inout</strong> <em>opt</em> <strong>let</strong> <em>opt</em> <strong>#</strong> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/parameter-name" target="_blank"><em>parameter-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/local-parameter-name" target="_blank"><em>local-parameter-name</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-annotation" target="_blank"><em>type-annotation</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/default-argument-clause" target="_blank"><em>default-argument-clause</em></a> <em>opt</em>
|
||
<em>parameter</em> → <strong>inout</strong> <em>opt</em> <strong>var</strong> <strong>#</strong> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/parameter-name" target="_blank"><em>parameter-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/local-parameter-name" target="_blank"><em>local-parameter-name</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-annotation" target="_blank"><em>type-annotation</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/default-argument-clause" target="_blank"><em>default-argument-clause</em></a> <em>opt</em>
|
||
<em>parameter</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a>
|
||
<em>parameter-name</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a> | <strong>_</strong>
|
||
<em>local-parameter-name</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a> | <strong>_</strong>
|
||
<em>default-argument-clause</em> → <strong>=</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>枚举声明语法
|
||
<em>enum-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/union-style-enum" target="_blank"><em>union-style-enum</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/raw-value-style-enum" target="_blank"><em>raw-value-style-enum</em></a>
|
||
<em>union-style-enum</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/enum-name" target="_blank"><em>enum-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-parameter-clause" target="_blank"><em>generic-parameter-clause</em></a> <em>opt</em> <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/union-style-enum-members" target="_blank"><em>union-style-enum-members</em></a> <em>opt</em> <strong>}</strong>
|
||
<em>union-style-enum-members</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/union-style-enum-member" target="_blank"><em>union-style-enum-member</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/union-style-enum-members" target="_blank"><em>union-style-enum-members</em></a> <em>opt</em>
|
||
<em>union-style-enum-member</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/declaration" target="_blank"><em>declaration</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/union-style-enum-case-clause" target="_blank"><em>union-style-enum-case-clause</em></a>
|
||
<em>union-style-enum-case-clause</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <strong>case</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/union-style-enum-case-list" target="_blank"><em>union-style-enum-case-list</em></a>
|
||
<em>union-style-enum-case-list</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/union-style-enum-case" target="_blank"><em>union-style-enum-case</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/union-style-enum-case" target="_blank"><em>union-style-enum-case</em></a> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/union-style-enum-case-list" target="_blank"><em>union-style-enum-case-list</em></a>
|
||
<em>union-style-enum-case</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/enum-case-name" target="_blank"><em>enum-case-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/tuple-type" target="_blank"><em>tuple-type</em></a> <em>opt</em>
|
||
<em>enum-name</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a>
|
||
<em>enum-case-name</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a>
|
||
<em>raw-value-style-enum</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/enum-name" target="_blank"><em>enum-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-parameter-clause" target="_blank"><em>generic-parameter-clause</em></a> <em>opt</em> <strong>:</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-identifier" target="_blank"><em>type-identifier</em></a> <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/raw-value-style-enum-members" target="_blank"><em>raw-value-style-enum-members</em></a> <em>opt</em> <strong>}</strong>
|
||
<em>raw-value-style-enum-members</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/raw-value-style-enum-member" target="_blank"><em>raw-value-style-enum-member</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/raw-value-style-enum-members" target="_blank"><em>raw-value-style-enum-members</em></a> <em>opt</em>
|
||
<em>raw-value-style-enum-member</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/declaration" target="_blank"><em>declaration</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/raw-value-style-enum-case-clause" target="_blank"><em>raw-value-style-enum-case-clause</em></a>
|
||
<em>raw-value-style-enum-case-clause</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <strong>case</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/raw-value-style-enum-case-list" target="_blank"><em>raw-value-style-enum-case-list</em></a>
|
||
<em>raw-value-style-enum-case-list</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/raw-value-style-enum-case" target="_blank"><em>raw-value-style-enum-case</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/raw-value-style-enum-case" target="_blank"><em>raw-value-style-enum-case</em></a> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/raw-value-style-enum-case-list" target="_blank"><em>raw-value-style-enum-case-list</em></a>
|
||
<em>raw-value-style-enum-case</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/enum-case-name" target="_blank"><em>enum-case-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/raw-value-assignment" target="_blank"><em>raw-value-assignment</em></a> <em>opt</em>
|
||
<em>raw-value-assignment</em> → <strong>=</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/literal" target="_blank"><em>literal</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>结构体声明语法
|
||
<em>struct-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <strong>struct</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/struct-name" target="_blank"><em>struct-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-parameter-clause" target="_blank"><em>generic-parameter-clause</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-inheritance-clause" target="_blank"><em>type-inheritance-clause</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/struct-body" target="_blank"><em>struct-body</em></a>
|
||
<em>struct-name</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a>
|
||
<em>struct-body</em> → <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/declarations" target="_blank"><em>declarations</em></a> <em>opt</em> <strong>}</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>类声明语法
|
||
<em>class-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <strong>class</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/class-name" target="_blank"><em>class-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-parameter-clause" target="_blank"><em>generic-parameter-clause</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-inheritance-clause" target="_blank"><em>type-inheritance-clause</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/class-body" target="_blank"><em>class-body</em></a>
|
||
<em>class-name</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a>
|
||
<em>class-body</em> → <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/declarations" target="_blank"><em>declarations</em></a> <em>opt</em> <strong>}</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>协议声明语法
|
||
<em>protocol-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <strong>protocol</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/protocol-name" target="_blank"><em>protocol-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-inheritance-clause" target="_blank"><em>type-inheritance-clause</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/protocol-body" target="_blank"><em>protocol-body</em></a>
|
||
<em>protocol-name</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a>
|
||
<em>protocol-body</em> → <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/protocol-member-declarations" target="_blank"><em>protocol-member-declarations</em></a> <em>opt</em> <strong>}</strong>
|
||
<em>protocol-member-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/protocol-property-declaration" target="_blank"><em>protocol-property-declaration</em></a>
|
||
<em>protocol-member-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/protocol-method-declaration" target="_blank"><em>protocol-method-declaration</em></a>
|
||
<em>protocol-member-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/protocol-initializer-declaration" target="_blank"><em>protocol-initializer-declaration</em></a>
|
||
<em>protocol-member-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/protocol-subscript-declaration" target="_blank"><em>protocol-subscript-declaration</em></a>
|
||
<em>protocol-member-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/protocol-associated-type-declaration" target="_blank"><em>protocol-associated-type-declaration</em></a>
|
||
<em>protocol-member-declarations</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/protocol-member-declaration" target="_blank"><em>protocol-member-declaration</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/protocol-member-declarations" target="_blank"><em>protocol-member-declarations</em></a> <em>opt</em></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>协议属性声明语法
|
||
<em>protocol-property-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/variable-declaration-head" target="_blank"><em>variable-declaration-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/variable-name" target="_blank"><em>variable-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-annotation" target="_blank"><em>type-annotation</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-setter-keyword-block" target="_blank"><em>getter-setter-keyword-block</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>协议方法声明语法
|
||
<em>protocol-method-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/function-head" target="_blank"><em>function-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/function-name" target="_blank"><em>function-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-parameter-clause" target="_blank"><em>generic-parameter-clause</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/function-signature" target="_blank"><em>function-signature</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>协议构造函数声明语法
|
||
<em>protocol-initializer-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/initializer-head" target="_blank"><em>initializer-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-parameter-clause" target="_blank"><em>generic-parameter-clause</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/parameter-clause" target="_blank"><em>parameter-clause</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>协议附属脚本声明语法
|
||
<em>protocol-subscript-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/subscript-head" target="_blank"><em>subscript-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/subscript-result" target="_blank"><em>subscript-result</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-setter-keyword-block" target="_blank"><em>getter-setter-keyword-block</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>协议关联类型声明语法
|
||
<em>protocol-associated-type-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/typealias-head" target="_blank"><em>typealias-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-inheritance-clause" target="_blank"><em>type-inheritance-clause</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/typealias-assignment" target="_blank"><em>typealias-assignment</em></a> <em>opt</em></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>构造函数声明语法
|
||
<em>initializer-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/initializer-head" target="_blank"><em>initializer-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-parameter-clause" target="_blank"><em>generic-parameter-clause</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/parameter-clause" target="_blank"><em>parameter-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/initializer-body" target="_blank"><em>initializer-body</em></a>
|
||
<em>initializer-head</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <strong>convenience</strong> <em>opt</em> <strong>init</strong>
|
||
<em>initializer-body</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/code-block" target="_blank"><em>code-block</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>析构函数声明语法
|
||
<em>deinitializer-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <strong>deinit</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/code-block" target="_blank"><em>code-block</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>扩展声明语法
|
||
<em>extension-declaration</em> → <strong>extension</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-identifier" target="_blank"><em>type-identifier</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-inheritance-clause" target="_blank"><em>type-inheritance-clause</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/extension-body" target="_blank"><em>extension-body</em></a>
|
||
<em>extension-body</em> → <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/declarations" target="_blank"><em>declarations</em></a> <em>opt</em> <strong>}</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>附属脚本声明语法
|
||
<em>subscript-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/subscript-head" target="_blank"><em>subscript-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/subscript-result" target="_blank"><em>subscript-result</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/code-block" target="_blank"><em>code-block</em></a>
|
||
<em>subscript-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/subscript-head" target="_blank"><em>subscript-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/subscript-result" target="_blank"><em>subscript-result</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-setter-block" target="_blank"><em>getter-setter-block</em></a>
|
||
<em>subscript-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/subscript-head" target="_blank"><em>subscript-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/subscript-result" target="_blank"><em>subscript-result</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-setter-keyword-block" target="_blank"><em>getter-setter-keyword-block</em></a>
|
||
<em>subscript-head</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <strong>subscript</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/parameter-clause" target="_blank"><em>parameter-clause</em></a>
|
||
<em>subscript-result</em> → <strong>-></strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>运算符声明语法
|
||
<em>operator-declaration</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/prefix-operator-declaration" target="_blank"><em>prefix-operator-declaration</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/postfix-operator-declaration" target="_blank"><em>postfix-operator-declaration</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/infix-operator-declaration" target="_blank"><em>infix-operator-declaration</em></a>
|
||
<em>prefix-operator-declaration</em> → <strong>operator</strong> <strong>prefix</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/operator" target="_blank"><em>operator</em></a> <strong>{</strong> <strong>}</strong>
|
||
<em>postfix-operator-declaration</em> → <strong>operator</strong> <strong>postfix</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/operator" target="_blank"><em>operator</em></a> <strong>{</strong> <strong>}</strong>
|
||
<em>infix-operator-declaration</em> → <strong>operator</strong> <strong>infix</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/operator" target="_blank"><em>operator</em></a> <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/infix-operator-attributes" target="_blank"><em>infix-operator-attributes</em></a> <em>opt</em> <strong>}</strong>
|
||
<em>infix-operator-attributes</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/precedence-clause" target="_blank"><em>precedence-clause</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/associativity-clause" target="_blank"><em>associativity-clause</em></a> <em>opt</em>
|
||
<em>precedence-clause</em> → <strong>precedence</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/precedence-level" target="_blank"><em>precedence-level</em></a>
|
||
<em>precedence-level</em> → Digit 0 through 255
|
||
<em>associativity-clause</em> → <strong>associativity</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/associativity" target="_blank"><em>associativity</em></a>
|
||
<em>associativity</em> → <strong>left</strong> | <strong>right</strong> | <strong>none</strong></p>
|
||
</blockquote>
|
||
<p><a name="patterns"></a></p>
|
||
<h2 id="-">模式</h2>
|
||
<blockquote>
|
||
<p>模式语法
|
||
<em>pattern</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/wildcard-pattern" target="_blank"><em>wildcard-pattern</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-annotation" target="_blank"><em>type-annotation</em></a> <em>opt</em>
|
||
<em>pattern</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/identifier-pattern" target="_blank"><em>identifier-pattern</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-annotation" target="_blank"><em>type-annotation</em></a> <em>opt</em>
|
||
<em>pattern</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/value-binding-pattern" target="_blank"><em>value-binding-pattern</em></a>
|
||
<em>pattern</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/tuple-pattern" target="_blank"><em>tuple-pattern</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-annotation" target="_blank"><em>type-annotation</em></a> <em>opt</em>
|
||
<em>pattern</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/enum-case-pattern" target="_blank"><em>enum-case-pattern</em></a>
|
||
<em>pattern</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/type-casting-pattern" target="_blank"><em>type-casting-pattern</em></a>
|
||
<em>pattern</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/expression-pattern" target="_blank"><em>expression-pattern</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>通配符模式语法
|
||
<em>wildcard-pattern</em> → <strong>_</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>标识符模式语法
|
||
<em>identifier-pattern</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>值绑定模式语法
|
||
<em>value-binding-pattern</em> → <strong>var</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/pattern" target="_blank"><em>pattern</em></a> | <strong>let</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/pattern" target="_blank"><em>pattern</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>元组模式语法
|
||
<em>tuple-pattern</em> → <strong>(</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/tuple-pattern-element-list" target="_blank"><em>tuple-pattern-element-list</em></a> <em>opt</em> <strong>)</strong>
|
||
<em>tuple-pattern-element-list</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/tuple-pattern-element" target="_blank"><em>tuple-pattern-element</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/tuple-pattern-element" target="_blank"><em>tuple-pattern-element</em></a> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/tuple-pattern-element-list" target="_blank"><em>tuple-pattern-element-list</em></a>
|
||
<em>tuple-pattern-element</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/pattern" target="_blank"><em>pattern</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>枚举用例模式语法
|
||
<em>enum-case-pattern</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-identifier" target="_blank"><em>type-identifier</em></a> <em>opt</em> <strong>.</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/enum-case-name" target="_blank"><em>enum-case-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/tuple-pattern" target="_blank"><em>tuple-pattern</em></a> <em>opt</em></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>类型转换模式语法
|
||
<em>type-casting-pattern</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/is-pattern" target="_blank"><em>is-pattern</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/as-pattern" target="_blank"><em>as-pattern</em></a>
|
||
<em>is-pattern</em> → <strong>is</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a>
|
||
<em>as-pattern</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html#//apple_ref/swift/grammar/pattern" target="_blank"><em>pattern</em></a> <strong>as</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>表达式模式语法
|
||
<em>expression-pattern</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a></p>
|
||
</blockquote>
|
||
<p><a name="attributes"></a></p>
|
||
<h2 id="-">特性</h2>
|
||
<blockquote>
|
||
<p>特性语法
|
||
<em>attribute</em> → <strong>@</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attribute-name" target="_blank"><em>attribute-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attribute-argument-clause" target="_blank"><em>attribute-argument-clause</em></a> <em>opt</em>
|
||
<em>attribute-name</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a>
|
||
<em>attribute-argument-clause</em> → <strong>(</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/balanced-tokens" target="_blank"><em>balanced-tokens</em></a> <em>opt</em> <strong>)</strong>
|
||
<em>attributes</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attribute" target="_blank"><em>attribute</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em>
|
||
<em>balanced-tokens</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/balanced-token" target="_blank"><em>balanced-token</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/balanced-tokens" target="_blank"><em>balanced-tokens</em></a> <em>opt</em>
|
||
<em>balanced-token</em> → <strong>(</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/balanced-tokens" target="_blank"><em>balanced-tokens</em></a> <em>opt</em> <strong>)</strong>
|
||
<em>balanced-token</em> → <strong>[</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/balanced-tokens" target="_blank"><em>balanced-tokens</em></a> <em>opt</em> <strong>]</strong>
|
||
<em>balanced-token</em> → <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/balanced-tokens" target="_blank"><em>balanced-tokens</em></a> <em>opt</em> <strong>}</strong>
|
||
<em>balanced-token</em> → Any identifier, keyword, literal, or operator
|
||
<em>balanced-token</em> → Any punctuation except (, ), [, ], {, or }</p>
|
||
</blockquote>
|
||
<p><a name="expressions"></a></p>
|
||
<h2 id="-">表达式</h2>
|
||
<blockquote>
|
||
<p>表达式语法
|
||
<em>expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/prefix-expression" target="_blank"><em>prefix-expression</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/binary-expressions" target="_blank"><em>binary-expressions</em></a> <em>opt</em>
|
||
<em>expression-list</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression-list" target="_blank"><em>expression-list</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>前缀表达式语法
|
||
<em>prefix-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/prefix-operator" target="_blank"><em>prefix-operator</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/postfix-expression" target="_blank"><em>postfix-expression</em></a>
|
||
<em>prefix-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/in-out-expression" target="_blank"><em>in-out-expression</em></a>
|
||
<em>in-out-expression</em> → <strong>&</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>二进制表达式语法
|
||
<em>binary-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/binary-operator" target="_blank"><em>binary-operator</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/prefix-expression" target="_blank"><em>prefix-expression</em></a>
|
||
<em>binary-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/assignment-operator" target="_blank"><em>assignment-operator</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/prefix-expression" target="_blank"><em>prefix-expression</em></a>
|
||
<em>binary-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/conditional-operator" target="_blank"><em>conditional-operator</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/prefix-expression" target="_blank"><em>prefix-expression</em></a>
|
||
<em>binary-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/type-casting-operator" target="_blank"><em>type-casting-operator</em></a>
|
||
<em>binary-expressions</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/binary-expression" target="_blank"><em>binary-expression</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/binary-expressions" target="_blank"><em>binary-expressions</em></a> <em>opt</em></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>赋值运算符语法
|
||
<em>assignment-operator</em> → <strong>=</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>条件运算符语法
|
||
<em>conditional-operator</em> → <strong>?</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> <strong>:</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>类型转换运算符语法
|
||
<em>type-casting-operator</em> → <strong>is</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a> | <strong>as</strong> <strong>?</strong> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>主表达式语法
|
||
<em>primary-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-argument-clause" target="_blank"><em>generic-argument-clause</em></a> <em>opt</em>
|
||
<em>primary-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/literal-expression" target="_blank"><em>literal-expression</em></a>
|
||
<em>primary-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/self-expression" target="_blank"><em>self-expression</em></a>
|
||
<em>primary-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/superclass-expression" target="_blank"><em>superclass-expression</em></a>
|
||
<em>primary-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/closure-expression" target="_blank"><em>closure-expression</em></a>
|
||
<em>primary-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/parenthesized-expression" target="_blank"><em>parenthesized-expression</em></a>
|
||
<em>primary-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/implicit-member-expression" target="_blank"><em>implicit-member-expression</em></a>
|
||
<em>primary-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/wildcard-expression" target="_blank"><em>wildcard-expression</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>字面量表达式语法
|
||
<em>literal-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/literal" target="_blank"><em>literal</em></a>
|
||
<em>literal-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/array-literal" target="_blank"><em>array-literal</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/dictionary-literal" target="_blank"><em>dictionary-literal</em></a>
|
||
<em>literal-expression</em> → <strong>__FILE__</strong> | <strong>__LINE__</strong> | <strong>__COLUMN__</strong> | <strong>__FUNCTION__</strong>
|
||
<em>array-literal</em> → <strong>[</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/array-literal-items" target="_blank"><em>array-literal-items</em></a> <em>opt</em> <strong>]</strong>
|
||
<em>array-literal-items</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/array-literal-item" target="_blank"><em>array-literal-item</em></a> <strong>,</strong> <em>opt</em> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/array-literal-item" target="_blank"><em>array-literal-item</em></a> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/array-literal-items" target="_blank"><em>array-literal-items</em></a>
|
||
<em>array-literal-item</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a>
|
||
<em>dictionary-literal</em> → <strong>[</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/dictionary-literal-items" target="_blank"><em>dictionary-literal-items</em></a> <strong>]</strong> | <strong>[</strong> <strong>:</strong> <strong>]</strong>
|
||
<em>dictionary-literal-items</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/dictionary-literal-item" target="_blank"><em>dictionary-literal-item</em></a> <strong>,</strong> <em>opt</em> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/dictionary-literal-item" target="_blank"><em>dictionary-literal-item</em></a> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/dictionary-literal-items" target="_blank"><em>dictionary-literal-items</em></a>
|
||
<em>dictionary-literal-item</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> <strong>:</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>Self 表达式语法
|
||
<em>self-expression</em> → <strong>self</strong>
|
||
<em>self-expression</em> → <strong>self</strong> <strong>.</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a>
|
||
<em>self-expression</em> → <strong>self</strong> <strong>[</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> <strong>]</strong>
|
||
<em>self-expression</em> → <strong>self</strong> <strong>.</strong> <strong>init</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>超类表达式语法
|
||
<em>superclass-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/superclass-method-expression" target="_blank"><em>superclass-method-expression</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/superclass-subscript-expression" target="_blank"><em>superclass-subscript-expression</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/superclass-initializer-expression" target="_blank"><em>superclass-initializer-expression</em></a>
|
||
<em>superclass-method-expression</em> → <strong>super</strong> <strong>.</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a>
|
||
<em>superclass-subscript-expression</em> → <strong>super</strong> <strong>[</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> <strong>]</strong>
|
||
<em>superclass-initializer-expression</em> → <strong>super</strong> <strong>.</strong> <strong>init</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>闭包表达式语法
|
||
<em>closure-expression</em> → <strong>{</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/closure-signature" target="_blank"><em>closure-signature</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/statements" target="_blank"><em>statements</em></a> <strong>}</strong>
|
||
<em>closure-signature</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/parameter-clause" target="_blank"><em>parameter-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/function-result" target="_blank"><em>function-result</em></a> <em>opt</em> <strong>in</strong>
|
||
<em>closure-signature</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier-list" target="_blank"><em>identifier-list</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/function-result" target="_blank"><em>function-result</em></a> <em>opt</em> <strong>in</strong>
|
||
<em>closure-signature</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/capture-list" target="_blank"><em>capture-list</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/parameter-clause" target="_blank"><em>parameter-clause</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/function-result" target="_blank"><em>function-result</em></a> <em>opt</em> <strong>in</strong>
|
||
<em>closure-signature</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/capture-list" target="_blank"><em>capture-list</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier-list" target="_blank"><em>identifier-list</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/function-result" target="_blank"><em>function-result</em></a> <em>opt</em> <strong>in</strong>
|
||
<em>closure-signature</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/capture-list" target="_blank"><em>capture-list</em></a> <strong>in</strong>
|
||
<em>capture-list</em> → <strong>[</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/capture-specifier" target="_blank"><em>capture-specifier</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> <strong>]</strong>
|
||
<em>capture-specifier</em> → <strong>weak</strong> | <strong>unowned</strong> | <strong>unowned(safe)</strong> | <strong>unowned(unsafe)</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>隐式成员表达式语法
|
||
<em>implicit-member-expression</em> → <strong>.</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>带圆括号的表达式语法
|
||
<em>parenthesized-expression</em> → <strong>(</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression-element-list" target="_blank"><em>expression-element-list</em></a> <em>opt</em> <strong>)</strong>
|
||
<em>expression-element-list</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression-element" target="_blank"><em>expression-element</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression-element" target="_blank"><em>expression-element</em></a> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression-element-list" target="_blank"><em>expression-element-list</em></a>
|
||
<em>expression-element</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a> <strong>:</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>通配符表达式语法
|
||
<em>wildcard-expression</em> → <strong>_</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>后缀表达式语法
|
||
<em>postfix-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/primary-expression" target="_blank"><em>primary-expression</em></a>
|
||
<em>postfix-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/postfix-expression" target="_blank"><em>postfix-expression</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/postfix-operator" target="_blank"><em>postfix-operator</em></a>
|
||
<em>postfix-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/function-call-expression" target="_blank"><em>function-call-expression</em></a>
|
||
<em>postfix-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/initializer-expression" target="_blank"><em>initializer-expression</em></a>
|
||
<em>postfix-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/explicit-member-expression" target="_blank"><em>explicit-member-expression</em></a>
|
||
<em>postfix-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/postfix-self-expression" target="_blank"><em>postfix-self-expression</em></a>
|
||
<em>postfix-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/dynamic-type-expression" target="_blank"><em>dynamic-type-expression</em></a>
|
||
<em>postfix-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/subscript-expression" target="_blank"><em>subscript-expression</em></a>
|
||
<em>postfix-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/forced-value-expression" target="_blank"><em>forced-value-expression</em></a>
|
||
<em>postfix-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/optional-chaining-expression" target="_blank"><em>optional-chaining-expression</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>函数调用表达式语法
|
||
<em>function-call-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/postfix-expression" target="_blank"><em>postfix-expression</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/parenthesized-expression" target="_blank"><em>parenthesized-expression</em></a>
|
||
<em>function-call-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/postfix-expression" target="_blank"><em>postfix-expression</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/parenthesized-expression" target="_blank"><em>parenthesized-expression</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/trailing-closure" target="_blank"><em>trailing-closure</em></a>
|
||
<em>trailing-closure</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/closure-expression" target="_blank"><em>closure-expression</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>初始化表达式语法
|
||
<em>initializer-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/postfix-expression" target="_blank"><em>postfix-expression</em></a> <strong>.</strong> <strong>init</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>显式成员表达式语法
|
||
<em>explicit-member-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/postfix-expression" target="_blank"><em>postfix-expression</em></a> <strong>.</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/decimal-digit" target="_blank"><em>decimal-digit</em></a>
|
||
<em>explicit-member-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/postfix-expression" target="_blank"><em>postfix-expression</em></a> <strong>.</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-argument-clause" target="_blank"><em>generic-argument-clause</em></a> <em>opt</em></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>Self 表达式语法
|
||
<em>postfix-self-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/postfix-expression" target="_blank"><em>postfix-expression</em></a> <strong>.</strong> <strong>self</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>动态类型表达式语法
|
||
<em>dynamic-type-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/postfix-expression" target="_blank"><em>postfix-expression</em></a> <strong>.</strong> <strong>dynamicType</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>附属脚本表达式语法
|
||
<em>subscript-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/postfix-expression" target="_blank"><em>postfix-expression</em></a> <strong>[</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression-list" target="_blank"><em>expression-list</em></a> <strong>]</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>Forced-value 表达式语法
|
||
<em>forced-value-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/postfix-expression" target="_blank"><em>postfix-expression</em></a> <strong>!</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>可选链表达式语法
|
||
<em>optional-chaining-expression</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/postfix-expression" target="_blank"><em>postfix-expression</em></a> <strong>?</strong></p>
|
||
</blockquote>
|
||
<p><a name="lexical_structure"></a></p>
|
||
<h2 id="-">词法结构</h2>
|
||
<blockquote>
|
||
<p>标识符语法
|
||
<em>identifier</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier-head" target="_blank"><em>identifier-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier-characters" target="_blank"><em>identifier-characters</em></a> <em>opt</em>
|
||
<em>identifier</em> → <strong>`</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier-head" target="_blank"><em>identifier-head</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier-characters" target="_blank"><em>identifier-characters</em></a> <em>opt</em> <strong>`</strong>
|
||
<em>identifier</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/implicit-parameter-name" target="_blank"><em>implicit-parameter-name</em></a>
|
||
<em>identifier-list</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier-list" target="_blank"><em>identifier-list</em></a>
|
||
<em>identifier-head</em> → Upper- or lowercase letter A through Z
|
||
<em>identifier-head</em> → U+00A8, U+00AA, U+00AD, U+00AF, U+00B2–U+00B5, or U+00B7–U+00BA
|
||
<em>identifier-head</em> → U+00BC–U+00BE, U+00C0–U+00D6, U+00D8–U+00F6, or U+00F8–U+00FF
|
||
<em>identifier-head</em> → U+0100–U+02FF, U+0370–U+167F, U+1681–U+180D, or U+180F–U+1DBF
|
||
<em>identifier-head</em> → U+1E00–U+1FFF
|
||
<em>identifier-head</em> → U+200B–U+200D, U+202A–U+202E, U+203F–U+2040, U+2054, or U+2060–U+206F
|
||
<em>identifier-head</em> → U+2070–U+20CF, U+2100–U+218F, U+2460–U+24FF, or U+2776–U+2793
|
||
<em>identifier-head</em> → U+2C00–U+2DFF or U+2E80–U+2FFF
|
||
<em>identifier-head</em> → U+3004–U+3007, U+3021–U+302F, U+3031–U+303F, or U+3040–U+D7FF
|
||
<em>identifier-head</em> → U+F900–U+FD3D, U+FD40–U+FDCF, U+FDF0–U+FE1F, or U+FE30–U+FE44
|
||
<em>identifier-head</em> → U+FE47–U+FFFD
|
||
<em>identifier-head</em> → U+10000–U+1FFFD, U+20000–U+2FFFD, U+30000–U+3FFFD, or U+40000–U+4FFFD
|
||
<em>identifier-head</em> → U+50000–U+5FFFD, U+60000–U+6FFFD, U+70000–U+7FFFD, or U+80000–U+8FFFD
|
||
<em>identifier-head</em> → U+90000–U+9FFFD, U+A0000–U+AFFFD, U+B0000–U+BFFFD, or U+C0000–U+CFFFD
|
||
<em>identifier-head</em> → U+D0000–U+DFFFD or U+E0000–U+EFFFD
|
||
<em>identifier-character</em> → Digit 0 through 9
|
||
<em>identifier-character</em> → U+0300–U+036F, U+1DC0–U+1DFF, U+20D0–U+20FF, or U+FE20–U+FE2F
|
||
<em>identifier-character</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier-head" target="_blank"><em>identifier-head</em></a>
|
||
<em>identifier-characters</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier-character" target="_blank"><em>identifier-character</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier-characters" target="_blank"><em>identifier-characters</em></a> <em>opt</em>
|
||
<em>implicit-parameter-name</em> → <strong>$</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/decimal-digits" target="_blank"><em>decimal-digits</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>字面量语法
|
||
<em>literal</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/integer-literal" target="_blank"><em>integer-literal</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/floating-point-literal" target="_blank"><em>floating-point-literal</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/string-literal" target="_blank"><em>string-literal</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>整形字面量语法
|
||
<em>integer-literal</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/binary-literal" target="_blank"><em>binary-literal</em></a>
|
||
<em>integer-literal</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/octal-literal" target="_blank"><em>octal-literal</em></a>
|
||
<em>integer-literal</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/decimal-literal" target="_blank"><em>decimal-literal</em></a>
|
||
<em>integer-literal</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-literal" target="_blank"><em>hexadecimal-literal</em></a>
|
||
<em>binary-literal</em> → <strong>0b</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/binary-digit" target="_blank"><em>binary-digit</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/binary-literal-characters" target="_blank"><em>binary-literal-characters</em></a> <em>opt</em>
|
||
<em>binary-digit</em> → Digit 0 or 1
|
||
<em>binary-literal-character</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/binary-digit" target="_blank"><em>binary-digit</em></a> | <strong>_</strong>
|
||
<em>binary-literal-characters</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/binary-literal-character" target="_blank"><em>binary-literal-character</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/binary-literal-characters" target="_blank"><em>binary-literal-characters</em></a> <em>opt</em>
|
||
<em>octal-literal</em> → <strong>0o</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/octal-digit" target="_blank"><em>octal-digit</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/octal-literal-characters" target="_blank"><em>octal-literal-characters</em></a> <em>opt</em>
|
||
<em>octal-digit</em> → Digit 0 through 7
|
||
<em>octal-literal-character</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/octal-digit" target="_blank"><em>octal-digit</em></a> | <strong>_</strong>
|
||
<em>octal-literal-characters</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/octal-literal-character" target="_blank"><em>octal-literal-character</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/octal-literal-characters" target="_blank"><em>octal-literal-characters</em></a> <em>opt</em>
|
||
<em>decimal-literal</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/decimal-digit" target="_blank"><em>decimal-digit</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/decimal-literal-characters" target="_blank"><em>decimal-literal-characters</em></a> <em>opt</em>
|
||
<em>decimal-digit</em> → Digit 0 through 9
|
||
<em>decimal-digits</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/decimal-digit" target="_blank"><em>decimal-digit</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/decimal-digits" target="_blank"><em>decimal-digits</em></a> <em>opt</em>
|
||
<em>decimal-literal-character</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/decimal-digit" target="_blank"><em>decimal-digit</em></a> | <strong>_</strong>
|
||
<em>decimal-literal-characters</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/decimal-literal-character" target="_blank"><em>decimal-literal-character</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/decimal-literal-characters" target="_blank"><em>decimal-literal-characters</em></a> <em>opt</em>
|
||
<em>hexadecimal-literal</em> → <strong>0x</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-digit" target="_blank"><em>hexadecimal-digit</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-literal-characters" target="_blank"><em>hexadecimal-literal-characters</em></a> <em>opt</em>
|
||
<em>hexadecimal-digit</em> → Digit 0 through 9, a through f, or A through F
|
||
<em>hexadecimal-literal-character</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-digit" target="_blank"><em>hexadecimal-digit</em></a> | <strong>_</strong>
|
||
<em>hexadecimal-literal-characters</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-literal-character" target="_blank"><em>hexadecimal-literal-character</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-literal-characters" target="_blank"><em>hexadecimal-literal-characters</em></a> <em>opt</em></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>浮点型字面量语法
|
||
<em>floating-point-literal</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/decimal-literal" target="_blank"><em>decimal-literal</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/decimal-fraction" target="_blank"><em>decimal-fraction</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/decimal-exponent" target="_blank"><em>decimal-exponent</em></a> <em>opt</em>
|
||
<em>floating-point-literal</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-literal" target="_blank"><em>hexadecimal-literal</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-fraction" target="_blank"><em>hexadecimal-fraction</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-exponent" target="_blank"><em>hexadecimal-exponent</em></a>
|
||
<em>decimal-fraction</em> → <strong>.</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/decimal-literal" target="_blank"><em>decimal-literal</em></a>
|
||
<em>decimal-exponent</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/floating-point-e" target="_blank"><em>floating-point-e</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/sign" target="_blank"><em>sign</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/decimal-literal" target="_blank"><em>decimal-literal</em></a>
|
||
<em>hexadecimal-fraction</em> → <strong>.</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-literal" target="_blank"><em>hexadecimal-literal</em></a> <em>opt</em>
|
||
<em>hexadecimal-exponent</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/floating-point-p" target="_blank"><em>floating-point-p</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/sign" target="_blank"><em>sign</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-literal" target="_blank"><em>hexadecimal-literal</em></a>
|
||
<em>floating-point-e</em> → <strong>e</strong> | <strong>E</strong>
|
||
<em>floating-point-p</em> → <strong>p</strong> | <strong>P</strong>
|
||
<em>sign</em> → <strong>+</strong> | <strong>-</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>字符型字面量语法
|
||
<em>string-literal</em> → <strong>"</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/quoted-text" target="_blank"><em>quoted-text</em></a> <strong>"</strong>
|
||
<em>quoted-text</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/quoted-text-item" target="_blank"><em>quoted-text-item</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/quoted-text" target="_blank"><em>quoted-text</em></a> <em>opt</em>
|
||
<em>quoted-text-item</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/escaped-character" target="_blank"><em>escaped-character</em></a>
|
||
<em>quoted-text-item</em> → <strong>(</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Expressions.html#//apple_ref/swift/grammar/expression" target="_blank"><em>expression</em></a> <strong>)</strong>
|
||
<em>quoted-text-item</em> → Any Unicode extended grapheme cluster except ", \, U+000A, or U+000D
|
||
<em>escaped-character</em> → <strong>\0</strong> | <strong>\</strong> | <strong>\t</strong> | <strong>\n</strong> | <strong>\r</strong> | <strong>\"</strong> | <strong>\'</strong>
|
||
<em>escaped-character</em> → <strong>\x</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-digit" target="_blank"><em>hexadecimal-digit</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-digit" target="_blank"><em>hexadecimal-digit</em></a>
|
||
<em>escaped-character</em> → <strong>\u</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-digit" target="_blank"><em>hexadecimal-digit</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-digit" target="_blank"><em>hexadecimal-digit</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-digit" target="_blank"><em>hexadecimal-digit</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-digit" target="_blank"><em>hexadecimal-digit</em></a>
|
||
<em>escaped-character</em> → <strong>\U</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-digit" target="_blank"><em>hexadecimal-digit</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-digit" target="_blank"><em>hexadecimal-digit</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-digit" target="_blank"><em>hexadecimal-digit</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-digit" target="_blank"><em>hexadecimal-digit</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-digit" target="_blank"><em>hexadecimal-digit</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-digit" target="_blank"><em>hexadecimal-digit</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-digit" target="_blank"><em>hexadecimal-digit</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/hexadecimal-digit" target="_blank"><em>hexadecimal-digit</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>运算符语法语法
|
||
<em>operator</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/operator-character" target="_blank"><em>operator-character</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/operator" target="_blank"><em>operator</em></a> <em>opt</em>
|
||
<em>operator-character</em> → <strong>/</strong> | <strong>=</strong> | <strong>-</strong> | <strong>+</strong> | <strong>!</strong> | <strong>*</strong> | <strong>%</strong> | <strong><</strong> | <strong>></strong> | <strong>&</strong> | <strong>|</strong> | <strong>^</strong> | <strong>~</strong> | <strong>.</strong>
|
||
<em>binary-operator</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/operator" target="_blank"><em>operator</em></a>
|
||
<em>prefix-operator</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/operator" target="_blank"><em>operator</em></a>
|
||
<em>postfix-operator</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/operator" target="_blank"><em>operator</em></a></p>
|
||
</blockquote>
|
||
<p><a name="types"></a></p>
|
||
<h2 id="-">类型</h2>
|
||
<blockquote>
|
||
<p>类型语法
|
||
<em>type</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/array-type" target="_blank"><em>array-type</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/function-type" target="_blank"><em>function-type</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-identifier" target="_blank"><em>type-identifier</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/tuple-type" target="_blank"><em>tuple-type</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/optional-type" target="_blank"><em>optional-type</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/implicitly-unwrapped-optional-type" target="_blank"><em>implicitly-unwrapped-optional-type</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/protocol-composition-type" target="_blank"><em>protocol-composition-type</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/metatype-type" target="_blank"><em>metatype-type</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>类型标注语法
|
||
<em>type-annotation</em> → <strong>:</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>类型标识语法
|
||
<em>type-identifier</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-name" target="_blank"><em>type-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-argument-clause" target="_blank"><em>generic-argument-clause</em></a> <em>opt</em> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-name" target="_blank"><em>type-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/GenericParametersAndArguments.html#//apple_ref/swift/grammar/generic-argument-clause" target="_blank"><em>generic-argument-clause</em></a> <em>opt</em> <strong>.</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-identifier" target="_blank"><em>type-identifier</em></a>
|
||
<em>type-name</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>元组类型语法
|
||
<em>tuple-type</em> → <strong>(</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/tuple-type-body" target="_blank"><em>tuple-type-body</em></a> <em>opt</em> <strong>)</strong>
|
||
<em>tuple-type-body</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/tuple-type-element-list" target="_blank"><em>tuple-type-element-list</em></a> <strong>...</strong> <em>opt</em>
|
||
<em>tuple-type-element-list</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/tuple-type-element" target="_blank"><em>tuple-type-element</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/tuple-type-element" target="_blank"><em>tuple-type-element</em></a> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/tuple-type-element-list" target="_blank"><em>tuple-type-element-list</em></a>
|
||
<em>tuple-type-element</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/swift/grammar/attributes" target="_blank"><em>attributes</em></a> <em>opt</em> <strong>inout</strong> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a> | <strong>inout</strong> <em>opt</em> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/element-name" target="_blank"><em>element-name</em></a> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-annotation" target="_blank"><em>type-annotation</em></a>
|
||
<em>element-name</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/identifier" target="_blank"><em>identifier</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>函数类型语法
|
||
<em>function-type</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a> <strong>-></strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>数组类型语法
|
||
<em>array-type</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a> <strong>[</strong> <strong>]</strong> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/array-type" target="_blank"><em>array-type</em></a> <strong>[</strong> <strong>]</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>可选类型语法
|
||
<em>optional-type</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a> <strong>?</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>隐式解析可选类型语法
|
||
<em>implicitly-unwrapped-optional-type</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a> <strong>!</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>协议合成类型语法
|
||
<em>protocol-composition-type</em> → <strong>protocol</strong> <strong><</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/protocol-identifier-list" target="_blank"><em>protocol-identifier-list</em></a> <em>opt</em> <strong>></strong>
|
||
<em>protocol-identifier-list</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/protocol-identifier" target="_blank"><em>protocol-identifier</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/protocol-identifier" target="_blank"><em>protocol-identifier</em></a> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/protocol-identifier-list" target="_blank"><em>protocol-identifier-list</em></a>
|
||
<em>protocol-identifier</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-identifier" target="_blank"><em>type-identifier</em></a></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>元类型语法
|
||
<em>metatype-type</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a> <strong>.</strong> <strong>Type</strong> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type" target="_blank"><em>type</em></a> <strong>.</strong> <strong>Protocol</strong></p>
|
||
</blockquote>
|
||
<p></p>
|
||
|
||
<blockquote>
|
||
<p>类型继承子句语法
|
||
<em>type-inheritance-clause</em> → <strong>:</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-inheritance-list" target="_blank"><em>type-inheritance-list</em></a>
|
||
<em>type-inheritance-list</em> → <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-identifier" target="_blank"><em>type-identifier</em></a> | <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-identifier" target="_blank"><em>type-identifier</em></a> <strong>,</strong> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/swift/grammar/type-inheritance-list" target="_blank"><em>type-inheritance-list</em></a></p>
|
||
</blockquote>
|
||
|
||
|
||
</section>
|
||
|
||
</div>
|
||
</div>
|
||
</div>
|
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|
||
|
||
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