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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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<i class="fa fa-check"></i> <b>2.2.</b> 基本运算符
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<i class="fa fa-check"></i> <b>2.3.</b> 字符串和字符
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</a>
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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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|
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</li>
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|
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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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||
|
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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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<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> 嵌套类型
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||
</a>
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||
|
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|
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</li>
|
||
|
||
<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
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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="2.21" data-path="chapter2/21_Protocols.html">
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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>
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||
|
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</li>
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<li class="chapter " data-level="2.22" data-path="chapter2/22_Generics.html">
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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
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</a>
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||
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</li>
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<li class="chapter " data-level="2.23" data-path="chapter2/23_Advanced_Operators.html">
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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
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</a>
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</li>
|
||
|
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|
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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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|
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|
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</li>
|
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|
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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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|
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</li>
|
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|
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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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|
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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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|
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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
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||
</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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|
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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
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||
</a>
|
||
|
||
|
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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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<a href="../chapter3/05_Declarations.html">
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<i class="fa fa-check"></i> <b>3.6.</b> 声明
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</a>
|
||
|
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|
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</li>
|
||
|
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<li class="chapter " data-level="3.7" data-path="chapter3/06_Attributes.html">
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|
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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
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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="3.8" data-path="chapter3/07_Patterns.html">
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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
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</a>
|
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|
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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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|
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<a href="../chapter3/08_Generic_Parameters_and_Arguments.html">
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<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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|
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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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<a href="../chapter3/09_Summary_of_the_Grammar.html">
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<i class="fa fa-check"></i> <b>3.10.</b> 语法总结
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</a>
|
||
|
||
|
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</li>
|
||
|
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|
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</ul>
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<a href="../chapter2/13_Inheritance.html" title="继承" class="chapter done " data-progress="2.13" style="left: 23.68421052631579%;"></a>
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<a href="../chapter2/17_Optional_Chaining.html" title="可选链" class="chapter " data-progress="2.17" style="left: 34.21052631578947%;"></a>
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<a href="../chapter2/18_Type_Casting.html" title="类型检查" class="chapter " data-progress="2.18" style="left: 36.8421052631579%;"></a>
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<a href="../chapter2/22_Generics.html" title="泛型" class="chapter " data-progress="2.22" style="left: 50%;"></a>
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</div>
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</div>
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<div class="page-inner">
|
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|
||
<section class="normal" id="section-gitbook_32">
|
||
|
||
<h1 id="-">析构过程</h1>
|
||
<p>在一个类的实例被释放之前，析构函数被立即调用。用关键字deinit来标示析构函数，类似于初始化函数用init来标示。析构函数只适用于类类型。</p>
|
||
<h2 id="-">析构过程原理</h2>
|
||
<p>Swift会自动释放不再需要的实例以释放资源。如自动引用计数那一章描述，Swift通过自动引用计数（ARC）处理实例的内存管理。通常当你的实例被释放时不需要手动的去清理。但是，当使用自己的资源时，你可能需要进行一些额外的清理。例如，如果创建了一个自定义的类来打开一个文件，并写入一些数据，你可能需要在类实例被释放之前关闭该文件。</p>
|
||
<p>在类的定义中，每个类最多只能有一个析构函数。析构函数不带任何参数，在写法上不带括号:</p>
|
||
<pre><code>1 deinit {
|
||
2 // 执行析构过程
|
||
3 }
|
||
</code></pre><p>析构函数是在实例释放发生前一步被自动调用。不允许主动调用自己的析构函数。子类继承了父类的析构函数，并且在子类析构函数实现的最后，父类的析构函数被自动调用。即使子类没有提供自己的析构函数，父类的析构函数也总是被调用。</p>
|
||
<p>因为直到实例的析构函数被调用时，实例才会被释放，所以析构函数可以访问所有请求实例的属性，并且根据那些属性可以修改它的行为(比如查找一个需要被关闭的文件的名称)。</p>
|
||
<h2 id="-">析构函数操作</h2>
|
||
<p>这里是一个析构函数操作的例子。这个例子是一个简单的游戏，定义了两种新类型，Bank和Player。Bank结构体管理一个虚拟货币的流通，在这个流通中Bank永远不可能拥有超过10,000的硬币。在这个游戏中有且只能有一个Bank存在，因此Bank由带有静态属性和静态方法的结构体实现，从而存储和管理其当前的状态。</p>
|
||
<pre><code>1 struct Bank {
|
||
2 static var coinsInBank = 10_000
|
||
3 static func vendCoins(var numberOfCoinsToVend: Int) -> Int {
|
||
4 numberOfCoinsToVend = min(numberOfCoinsToVend, coinsInBank)
|
||
5 coinsInBank -= numberOfCoinsToVend
|
||
6 return numberOfCoinsToVend
|
||
7 }
|
||
8 static func receiveCoins(coins: Int) {
|
||
9 coinsInBank += coins
|
||
10 }
|
||
11 }
|
||
</code></pre><p>Bank根据它的coinsInBank属性来跟踪当前它拥有的硬币数量。银行还提供两个方法—vendCoins和receiveCoins，用来处理硬币的分发和收集。</p>
|
||
<p>vendCoins方法在bank分发硬币之前检查是否有足够的硬币。如果没有足够多的硬币，bank返回一个比请求时小的数字(如果没有硬币留在bank中就返回0)。vendCoins方法声明numberOfCoinsToVend为一个变量参数，这样就可以在方法体的内部修改数字，而不需要定义一个新的变量。vendCoins方法返回一个整型值，表明了提供的硬币的实际数目。</p>
|
||
<p>receiveCoins方法只是将bank的硬币存储和接收到的硬币数目相加，再保存回bank。</p>
|
||
<p>Player类描述了游戏中的一个玩家。每一个player在任何时刻都有一定数量的硬币存储在他们的钱包中。这通过player的coinsInPurse属性来体现:</p>
|
||
<pre><code> 1 class Player {
|
||
2 var coinsInPurse: Int
|
||
3 init(coins: Int) {
|
||
4 coinsInPurse = Bank.vendCoins(coins)
|
||
5 }
|
||
6 func winCoins(coins: Int) {
|
||
7 coinsInPurse += Bank.vendCoins(coins)
|
||
8 }
|
||
9 deinit {
|
||
10 Bank.receiveCoins(coinsInPurse)
|
||
11 }
|
||
12 }
|
||
</code></pre><p>每个Player实例都由一个指定数目硬币组成的启动额度初始化，这些硬币在bank初始化的过程中得到。如果没有足够的硬币可用，Player实例可能收到比指定数目少的硬币。</p>
|
||
<p>Player类定义了一个winCoins方法，该方法从bank获取一定数量的硬币，并把它们添加到player的钱包。Player类还实现了一个析构函数，这个析构函数在Player实例释放前一步被调用。这里析构函数只是将player的所有硬币都返回给bank:</p>
|
||
<pre><code>1 var playerOne: Player? = Player(coins: 100)
|
||
2 println("A new player has joined the game with \ (playerOne!.coinsInPurse) coins")
|
||
3 // 输出 "A new player has joined the game with 100 coins"
|
||
4 println("There are now \(Bank.coinsInBank) coins left in the bank")
|
||
5 // 输出 "There are now 9900 coins left in the bank"
|
||
</code></pre><p>一个新的Player实例随着一个100个硬币(如果有)的请求而被创建。这个Player实例存储在一个名为playerOne的可选Player变量中。这里使用一个可选变量，是因为players可以随时离开游戏。设置为可选使得你可以跟踪当前是否有player在游戏中。</p>
|
||
<p>因为playerOne是可选的，所以由一个感叹号(!)来修饰，每当其winCoins方法被调用时，coinsInPurse属性被访问并打印出它的默认硬币数目。</p>
|
||
<pre><code>1 playerOne!.winCoins(2_000)
|
||
2 println("PlayerOne won 2000 coins & now has \ (playerOne!.coinsInPurse) coins")
|
||
3 // 输出 "PlayerOne won 2000 coins & now has 2100 coins"
|
||
4 println("The bank now only has \(Bank.coinsInBank) coins left")
|
||
5 // 输出 "The bank now only has 7900 coins left"
|
||
</code></pre><p>这里，player已经赢得了2,000硬币。player的钱包现在有2,100硬币，bank只剩余7,900硬币。</p>
|
||
<pre><code>1 playerOne = nil
|
||
2 println("PlayerOne has left the game")
|
||
3 // 输出 "PlayerOne has left the game"
|
||
4 println("The bank now has \(Bank.coinsInBank) coins")
|
||
5 // 输出 "The bank now has 10000 coins"
|
||
</code></pre><p>player现在已经离开了游戏。这表明是要将可选的playerOne变量设置为nil，意思是"没有Player实例"。当这种情况发生的时候，playerOne变量对Player实例的引用被破坏了。没有其它属性或者变量引用Player实例，因此为了清空它占用的内存从而释放它。在这发生前一步，其析构函数被自动调用，其硬币被返回到bank。</p>
|
||
|
||
|
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