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> 翻译:[成都老码团队翻译组-Arya](http://weibo.com/littlekok/)
> 校对:[成都老码团队翻译组-Oberyn](http://weibo.com/u/5241713117)
# Swift 版本历史记录
---
本页内容包括:
- [XCode6.1 Swift语法文档更新](#xcode6_1)
- [XCode6.1 Beta2 Swift语法文档更新](#xcode6_1_Beta2)
- [XCode6.1 Beta1 Swift语法文档更新](#xcode6_1_Beta1)
- [XCode6 Beta7 Swift语法文档更新](#xcode6_beta7)
- [XCode6 Beta6 Swift语法文档更新](#xcode6_beta6)
- [XCode6 Beta5 Swift语法文档更新](#xcode6_beta5)
- [XCode6 Beta4 Swift语法文档更新](#xcode6_beta4)
- [XCode6 Beta3 Swift语法文档更新](#xcode6_beta3)
- [XCode6 Beta2 Swift语法文档更新](#xcode6_beta2)
- [XCode6 Beta1 Swift语法文档更新](#xcode6_beta1)
- XCode6下载: [老码云盘下载](http://pan.baidu.com/disk/home#from=share_pan_logo&path=%252F%25E8%2580%2581%25E7%25A0%2581%25E4%25BA%2591%25E7%259B%2598-XCode6%252FXCode6-Beta5)
以下部分是针对XCode6每一次Beta版本直至正式版发布Swift语法部分的更新归类
<a name="xcode6_1"></a>
### XCode6.1中Swift语法更新
***注意苹果此时发布了统一的版本XCode6.1其中将以前的XCode6.0.1和XCode6.1 Beta系列版本合并***
<table class="graybox" border="0" cellspacing="0" cellpadding="5">
<thead>
<tr>
<th scope="col" width="100">发布日期</th>
<th scope="col">语法变更记录</th>
</tr>
</thead>
<tbody>
<tr>
<td scope="row">2014-10-10</td>
<td><ul class="list-bullet">
<li><p>
增加了一个完整的关于<a href="http://developer.apple.com/library/etc/redirect/xcode/devtools/419f35/documentation/Swift/Conceptual/Swift_Programming_Language/Initialization.html">失败构造器(Failable Initializers)</a>的指南文档
</li>
<li><p>
增加了一个关于协议的<a href="http://developer.apple.com/library/etc/redirect/xcode/devtools/419f35/documentation/Swift/Conceptual/Swift_Programming_Language/Protocols.html">失败构造器需求(Failable Initializer Requirements)</a>的描述
</li>
<li><p>
`Any`类型的常量或变量现在可以包含一个函数实例了。同时更新了<a href="http://developer.apple.com/library/etc/redirect/xcode/devtools/419f35/documentation/Swift/Conceptual/Swift_Programming_Language/TypeCasting.html">`Any`</a>章节的案例用来演示如何在swith语句中检查和转换一个函数类型。
</li>
</ul>
</td>
</tr>
</tbody>
</table>
<a name="xcode6_1_Beta2"></a>
### XCode6.1 Beta2中Swift语法更新
***注意苹果此时发布了XCode6.0.1版本(也称为XCode6正式版)此版本用于iOS的开发同时也发布子版本XCode6.1 Beta2此版本为OSX开发做准备以下所述的更改仅对XCode6.1 Beta2有效***
<table class="graybox" border="0" cellspacing="0" cellpadding="5">
<thead>
<tr>
<th scope="col" width="100">发布日期</th>
<th scope="col">语法变更记录</th>
</tr>
</thead>
<tbody>
<tr>
<td scope="row">2014-09-15</td>
<td><ul class="list-bullet">
<li><p>
带有原始值的枚举类型增加了一个`rawValue`属性替代`toRaw()`方法,同时使用了一个以`rawValue`为参数的失败构造器来替代`fromRaw()`方法。更多的信息,请看<a href="http://developer.apple.com/library/etc/redirect/xcode/devtools/419f35/documentation/Swift/Conceptual/Swift_Programming_Language/Enumerations.html">原始值(Raw Values)</a><a href="http://developer.apple.com/library/etc/redirect/xcode/devtools/419f35/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html">带原始值的枚举类型(Enumerations with Cases of a Raw-Value Type)</a>部分
</li>
</ul>
</td>
</tr>
</tbody>
</table>
<a name="xcode6_1_Beta1"></a>
### XCode6.1 Beta1中Swift语法更新
***注意苹果此时发布了XCode6 GM版本此版本用于iOS的开发同时也发布子版本XCode6.1 Beta1此版本为OSX开发做准备以下所述的更改仅对XCode6.1 Beta1有效***
<table class="graybox" border="0" cellspacing="0" cellpadding="5">
<thead>
<tr>
<th scope="col" width="100">发布日期</th>
<th scope="col">语法变更记录</th>
</tr>
</thead>
<tbody>
<tr>
<td scope="row">2014-09-09</td>
<td><ul class="list-bullet">
<li><p>
增加了一个新的关于<a href="http://developer.apple.com/library/etc/redirect/xcode/devtools/419f35/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html">失败构造器(Failable Initializers)</a>的参考章节,失败构造器可以触发失败的构造过程
</li>
<li><p>
自定义运算符现在可以包含`?`字符,更新的<a href="http://developer.apple.com/library/etc/redirect/xcode/devtools/419f35/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html">运算符(Operators)</a>章节描述了改进后的规则,并且从<a href="http://developer.apple.com/library/etc/redirect/xcode/devtools/419f35/documentation/Swift/Conceptual/Swift_Programming_Language/AdvancedOperators.html">自定义运算符(Custom Operators)</a>章节删除了重复的运算符有效字符集合
</li>
</ul>
</td>
</tr>
</tbody>
</table>
<a name="xcode6_beta7"></a>
### XCode6 Beta7中Swift语法更新
***注意苹果在这个版本发布后没有及时的更新Swift Programming Language文档,以下是[老码团队](http://weibo.com/u/5241713117)通过XCode Beta7 Release Note总结的更改说明***
<table class="graybox" border="0" cellspacing="0" cellpadding="5">
<thead>
<tr>
<th scope="col" width="100">发布日期</th>
<th scope="col">语法变更记录</th>
</tr>
</thead>
<tbody>
<tr>
<td scope="row">2014-09-03</td>
<td><ul class="list-bullet">
<li><p>
实现了内部库的修改和适配,主要包括如下:
1大量内部类或者函数遵循Optional类型和协议
2移除大部分函数返回类型隐式解封可选类型的使用
</li>
<li><p>
对于泛型的类库函数或接口统一从T!更换为T或T这样使得语法更加严谨明确了可能返回为空和不为空的情况
</li>
<li><p>
字符类型不能使用+运算法链接,可以以 `String(C1)+String(2)` 的方式实现字符间链接
</li>
<li><p>
重写了Sort函数解决了栈溢出的问题
</li>
</ul>
</td>
</tr>
</tbody>
</table>
<a name="xcode6_beta6"></a>
### XCode6 Beta6中Swift语法更新
<table class="graybox" border="0" cellspacing="0" cellpadding="5">
<thead>
<tr>
<th scope="col" width="100">发布日期</th>
<th scope="col">语法变更记录</th>
</tr>
</thead>
<tbody>
<tr>
<td scope="row">2014-08-18</td>
<td><ul class="list-bullet">
<li><p>
在章节协议中,增加新的小节:<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Protocols.html#//apple_ref/doc/uid/TP40014097-CH25-XID_397">对构造器的规定Initializer Requirements</a></p>
</li>
<li><p>
在章节协议中,增加新的小节:<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Protocols.html#//apple_ref/doc/uid/TP40014097-CH25-XID_409">类专属协议class-only protocols</a></p>
</li>
<li><p>
<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/TheBasics.html#//apple_ref/doc/uid/TP40014097-CH5-XID_494">断言(assertions)</a>现在可以使用字符串内插语法,并删除了文档中有冲突的注释</p>
</li>
<li><p>
更新了<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/StringsAndCharacters.html#//apple_ref/doc/uid/TP40014097-CH7-XID_428">连接字符串和字符Concatenating Strings and Characters</a>小节来说明一个事实,那就是字符串和字符不能再用<code>+</code>号运算符或者复合加法运算符<code>+=</code>相互连接,这两种运算符现在只能用于字符串之间相连。请使用<code>String</code>类型的<code>append</code>方法在一个字符串的尾部增加单个字符</p>
</li>
<li><p>
<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Attributes.html#//apple_ref/doc/uid/TP40014097-CH35-XID_516">声明特性Declaration Attributes</a>章节增加了关于<code>availability</code>特性的一些信息</p>
</li>
</ul>
</td>
</tr>
</tbody>
</table>
<a name="xcode6_beta5"></a>
### XCode6 Beta5中Swift语法更新
<table class="graybox" border="0" cellspacing="0" cellpadding="5">
<thead>
<tr>
<th scope="col" width="100">发布日期</th>
<th scope="col">语法变更记录</th>
</tr>
</thead>
<tbody>
<tr>
<td scope="row">2014-08-04</td>
<td><ul class="list-bullet">
<li><p>
<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/TheBasics.html#//apple_ref/doc/uid/TP40014097-CH5-XID_478">可选类型Optionals</a> 若有值时,不再隐式的转换为 <code>true</code>,同样,若无值时,也不再隐式的转换为 <code>false</code>, 这是为了避免在判别 optional <code>Bool</code> 的值时产生困惑。 替代的方案是,用<code>==</code><code>!=</code> 运算符显式地去判断Optinal是否是 <code>nil</code>,以确认其是否包含值。
</li>
<li><p>
Swift新增了一个 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/BasicOperators.html#//apple_ref/doc/uid/TP40014097-CH6-XID_124" data-id="//apple_ref/doc/uid/TP40014097-CH6-XID_124">Nil合并运算符Nil Coalescing Operator</a> (<code>a ?? b</code>), 该表达式中如果Optional <code>a</code>的值存在则取得它并返回若Optional <code>a</code><code>nil</code>,则返回默认值 <code>b</code>
</li>
<li><p>
更新和扩展 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/StringsAndCharacters.html#//apple_ref/doc/uid/TP40014097-CH7-XID_434">字符串的比较Comparing Strings</a> 章节,用以反映和展示'字符串和字符的比较',以及'前缀prefix/后缀(postfix)比较'都开始基于扩展字符集(extended grapheme clusters)规范的等价比较.
</li>
<li><p>
现在,你可以通过 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/OptionalChaining.html#//apple_ref/doc/uid/TP40014097-CH21-XID_356">可选链Optional Chaining</a>给属性设值将其赋给一个下标脚注subscript; 或调用一个变异mutating方法或运算符。对此章节——<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/OptionalChaining.html#//apple_ref/doc/uid/TP40014097-CH21-XID_364">通过可选链访问属性Accessing Properties Through Optional Chaining</a>的内容已经被相应的更新。而章节——<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/OptionalChaining.html#//apple_ref/doc/uid/TP40014097-CH21-XID_361">通过可选链调用方法Calling Methods Through Optional Chaining</a>中,关于检查方法调用是否成功的例子,已被扩展为展示如何检查一个属性是否被设值成功。
</li>
<li><p>
在章节可选链中,增加一个新的小节 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/OptionalChaining.html#//apple_ref/doc/uid/TP40014097-CH21-XID_364">访问可选类型的下标脚注Accessing Subscripts of Optional Type</a>
</li>
<li><p>
更新章节 <a href="CollectionTypes.html#//apple_ref/doc/uid/TP40014097-CH8-XID_176" data-id="//apple_ref/doc/uid/TP40014097-CH8-XID_176">访问和修改数组(Accessing and Modifying an Array)</a> 以标示:从该版本起,不能再通过<code>+=</code> 运算符给一个数组添加一个新的项。. 对应的替代方案是, 使<code>append</code> 方法, 或者通过<code>+=</code>运算符来添加一个<b>只有一个项的数组</b>single-item Array.</li>
<li><p>
添加了一个提示:在 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/BasicOperators.html#//apple_ref/doc/uid/TP40014097-CH6-XID_126">范围运算符Range Operators</a>中,比如, <code>a...b</code><code>a..&lt;b</code> ,起始值<code>a</code>不能大于结束值<code>b</code>.
</li>
<li><p>
重写了<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Inheritance.html#//apple_ref/doc/uid/TP40014097-CH17-XID_293">继承Inheritance</a> 这一章删除了本章中关于构造器重写的介绍性报道转而将更多的注意力放到新增的部分——子类的新功能以及如何通过重写overrides修改已有的功能。另外小节 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Inheritance.html#//apple_ref/doc/uid/TP40014097-CH17-XID_301">重写属性的Getters和SettersOverriding Property Getters and Setters</a> 中的例子已经被替换为展示如何重写一个 <code>description</code> 属性. (而关于如何在子类的构造器中修改继承属性的默认值的例子,已经被移到 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Inheritance.html#//apple_ref/doc/uid/TP40014097-CH17-XID_293">构造过程Initialization</a> 这一章.)
</li>
<li><p>
更新了 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Initialization.html#//apple_ref/doc/uid/TP40014097-CH18-XID_331">构造器的继承与重写Initializer Inheritance and Overriding</a> 小节以标示: 重写一个特定的构造器必须使用 <code>override</code> 修饰符.
</li>
<li><p>
更新 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Initialization.html#//apple_ref/doc/uid/TP40014097-CH18-XID_339"> Required构造器Required Initializers</a> 小节以标示:<code>required</code> 修饰符现在需要出现在所有子类的required构造器的声明中, 而required构造器的实现现在可以仅从父类自动继承。
</li>
<li><p>
中置Infix<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/AdvancedOperators.html#//apple_ref/doc/uid/TP40014097-CH27-XID_80">运算符函数Operator Functions</a> 不再需要<code>@infix</code> 属性.
</li>
<li><p>
<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/RevisionHistory.html#//apple_ref/doc/uid/TP40014097-CH40-XID_1631">前置和后置运算符(Prefix and Postfix Operators)</a><code>@prefix</code><code>@postfix</code> 属性,已变更为 <code>prefix</code><code>postfix</code> 声明修饰符declaration modifiers.
</li>
<li><p>
增加一条注解当Prefix和postfix运算符被作用于同一个操作数时关于<a href="AdvancedOperators.html#//apple_ref/doc/uid/TP40014097-CH27-XID_81" data-id="//apple_ref/doc/uid/TP40014097-CH27-XID_81">前置和后置运算符(Prefix and Postfix Operators)</a>的顺序(postfix运算符会先被执行)
</li>
<li><p>
在运算符函数Operator functions <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/AdvancedOperators.html#//apple_ref/doc/uid/TP40014097-CH27-XID_82" data-id="//apple_ref/doc/uid/TP40014097-CH27-XID_82">组合赋值运算符Compound Assignment Operators</a> 不再使用 <code>@assignment</code> 属性来定义函数.
</li>
<li><p>
在这个版本中,在定义<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/AdvancedOperators.html#//apple_ref/doc/uid/TP40014097-CH27-XID_85">自定义操作符Custom Operators</a> 时,<b>修饰符Modifiers的出现顺序发生变化</b>。比如, 现在,你该编写 <code>prefix operator</code> 而不是 <code>operator prefix</code>.
</li>
<li><p>
增加信息:关于<code>dynamic</code> 声明修饰符declaration modifier于章节 <a href="Declarations.html#//apple_ref/doc/uid/TP40014097-CH34-XID_705" data-id="//apple_ref/doc/uid/TP40014097-CH34-XID_705">声明修饰符Declaration Modifiers</a>.
</li>
<li><p>
增加信息:<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/doc/uid/TP40014097-CH30-XID_886">字面量Literals</a> 的类型推导type inference
</li>
<li><p>
为章节<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/doc/uid/TP40014097-CH34-XID_597">Curried Functions</a>添加了更多的信息.
</li>
</ul>
</td>
</tr>
</tbody>
</table>
<a name="xcode6_beta4"></a>
#### XCode6 Beta4中Swift语法更新
<table class="graybox" border="0" cellspacing="0" cellpadding="5">
<thead>
<tr>
<th scope="col" width="100">发布日期</th>
<th scope="col">语法变更记录</th>
</tr>
</thead>
<tbody>
<tr>
<td scope="row">2014-07-21</td>
<td><ul class="list-bullet">
<li><p>
加入新的章节 <a href=https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/AccessControl.html#//apple_ref/doc/uid/TP40014097-CH41-XID_29">权限控制Access Control</a>.
</li>
<li><p>
更新了章节 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/StringsAndCharacters.html#//apple_ref/doc/uid/TP40014097-CH7-XID_413">字符串和字符Strings and Characters</a> 用以表明在Swift中<code>Character</code> 类型现在代表的是扩展字符集(extended grapheme cluster)中的一个Unicode为此新增了小节 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/StringsAndCharacters.html#//apple_ref/doc/uid/TP40014097-CH7-XID_431">Extended Grapheme Clusters</a> 。同时,为小节 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/StringsAndCharacters.html#//apple_ref/doc/uid/TP40014097-CH7-XID_428">Unicode标量Unicode Scalars</a><a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/StringsAndCharacters.html#//apple_ref/doc/uid/TP40014097-CH7-XID_434">字符串比较Comparing Strings</a>增加了更多内容.
</li>
<li><p>
更新章节<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/doc/uid/TP40014097-CH30-XID_856">字符串字面量String Literals</a>在一个字符串中Unicode标量Unicode scalars<code>\u{n}</code>的形式来表示, <code>n</code> 是一个最大可以有8位的16进制数hexadecimal digits
</li>
<li><p>
<code>NSString</code> <code>length</code> 属性已被映射到Swift的内建 <code>String</code>类型。(注意,这两属性的类型是<code>utf16<color="red">C</color>ount</code>,而非 <code>utf16count</code>.
</li>
<li><p>
Swift的内建 <code>String</code> 类型不再拥有 <code>uppercaseString</code><code>lowercaseString</code> 属性.其对应部分在章节 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/StringsAndCharacters.html#//apple_ref/doc/uid/TP40014097-CH7-XID_413">字符串和字符Strings and Characters</a>已经被删除, 并且各种对应的代码用例也已被更新.
</li>
<li><p>
加入新的章节 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Initialization.html#//apple_ref/doc/uid/TP40014097-CH18-XID_315">没有外部名的构造器参数Initializer Parameters Without External Names</a>.
</li>
<li><p>
加入新的章节 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Initialization.html#//apple_ref/doc/uid/TP40014097-CH18-XID_339"> Required构造器Required Initializers</a>.
</li>
<li><p>
加入新的章节 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Functions.html#//apple_ref/doc/uid/TP40014097-CH10-XID_252">可选元祖(函数)返回类型 Optional Tuple Return Types</a>.
</li>
<li><p>
更新章节 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/TheBasics.html#//apple_ref/doc/uid/TP40014097-CH5-XID_453">类型标注Type Annotations</a> 多个相关变量可以用“类型标注”type annotaion在同一行中声明为同一类型。
</li>
<li><p>
<code>@optional</code>, <code>@lazy</code>, <code>@final</code>, <code>@required</code> 等关键字被更新为 <code>optional</code>, <code>lazy</code>, <code>final</code>, <code>required</code> <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/doc/uid/TP40014097-CH34-XID_705">参见声明修饰符Declaration Modifiers</a>.
</li>
<li><p>
更新整本书 —— 引用 <code>..&lt;</code> 作为<a href="BasicOperators.html#//apple_ref/doc/uid/TP40014097-CH6-XID_128" data-id="//apple_ref/doc/uid/TP40014097-CH6-XID_128">区间运算符Half-Open Range Operator</a> (取代原先的<code>..</code> ).
</li>
<li><p>
更新了小节 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/CollectionTypes.html#//apple_ref/doc/uid/TP40014097-CH8-XID_185">读取和修改字典Accessing and Modifying a Dictionary</a> <code>Dictionary</code> 现在早呢更加了一个 Boolean型的属性 <code>isEmpty</code>
</li>
<li><p>
解释了哪些字符(集)可被用来定义<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/AdvancedOperators.html#//apple_ref/doc/uid/TP40014097-CH27-XID_85">自定义操作符 Custom Operators</a>
</li>
<li><p>
<code>nil</code> 和布尔运算中的 <code>true</code><code>false</code> 现在被定义为字面量<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/doc/uid/TP40014097-CH30-XID_886">Literals</a>.
</li>
</ul></td>
</td>
</tr>
</tbody>
</table>
<a name="xcode6_beta3"></a>
#### XCode6 Beta3中Swift语法更新
<table class="graybox" border="0" cellspacing="0" cellpadding="5">
<thead>
<tr>
<th scope="col" width="100">发布日期</th>
<th scope="col">语法变更记录</th>
</tr>
</thead>
<tbody>
<tr>
<td scope="row">2014-07-7</td>
<td><ul class="list-bullet">
<li><p>
Swift 中的数组 <code>Array</code> 类型从现在起具备了完整的值语义。具体信息被更新到 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/CollectionTypes.html#//apple_ref/doc/uid/TP40014097-CH8-XID_170">集合的可变性Mutability of Collections</a><a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/CollectionTypes.html#//apple_ref/doc/uid/TP40014097-CH8-XID_172">数组Arrays</a> 两小节,以反映这个新的变化. 此外,还解释了如何 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/ClassesAndStructures.html#//apple_ref/doc/uid/TP40014097-CH13-XID_150">给Strings, Arrays和Dictionaries进行赋值和拷贝 Assignment and Copy Behavior for Strings, Arrays, and Dictionaries</a>.
</li>
<li><p>
<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/CollectionTypes.html#//apple_ref/doc/uid/TP40014097-CH8-XID_173">数组类型速记语法Array Type Shorthand Syntax</a><code>SomeType[]</code>.更新为<code>[SomeType]</code>
</li>
<li><p>
加入新的小节:<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/CollectionTypes.html#//apple_ref/doc/uid/TP40014097-CH8-XID_182">字典类型的速记语法Dictionary Type Shorthand Syntax)</a>. <code>[KeyType: ValueType]</code>.
</li>
<li><p>
加入新的小节:<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/CollectionTypes.html#//apple_ref/doc/uid/TP40014097-CH8-XID_189">字典键类型的哈希值Hash Values for Dictionary Key Types)</a>.
</li>
<li><p>
例子 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Closures.html#//apple_ref/doc/uid/TP40014097-CH11-XID_154">闭包表达式 (Closure Expressions)</a> 中使用新的全局函数 <code>sorted</code> 取代原先的全局函数 <code>sort</code> 去展示如何返回一个全新的数组.
</li>
<li><p>
更新关于 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Initialization.html#//apple_ref/doc/uid/TP40014097-CH18-XID_320">结构体逐一成员构造器 Memberwise Initializers for Structure Types</a> 的描述:即使结构体的成员<b>没有默认值</b>,逐一成员构造器也可以自动获得。
</li>
<li><p>
<a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/BasicOperators.html#//apple_ref/doc/uid/TP40014097-CH6-XID_128">区间运算符Half-Open Range Operator</a><code>..</code>更新到<code>..<</code><p>
<li><p>
添加一个例子 <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Generics.html#//apple_ref/doc/uid/TP40014097-CH26-XID_285">扩展一个泛型Extending a Generic Type</a>
</li>
</ul></td>
</td>
</tr>
</tbody>
</table>
<a name="xcode6_beta2"></a>
#### XCode6 Beta2中Swift语法更新
<table class="graybox" border="0" cellspacing="0" cellpadding="5">
<thead>
<tr>
<th scope="col" width="100">发布日期</th>
<th scope="col">语法变更记录</th>
</tr>
</thead>
<tbody>
<tr>
<td scope="row">2014-07-7</td>
<td><ul class="list-bullet">
<li><p>
发布新的文档用以详述Swift - 苹果公司针对iOS和OS X应用的全新开发语言
</li>
</td>
</tr>
</tbody>
</table>
<a name="xcode6_beta1"></a>
#### XCode6 Beta1中Swift语法更新
<table class="graybox" border="0" cellspacing="0" cellpadding="5">
<thead>
<tr>
<th scope="col" width="100">发布日期</th>
<th scope="col">语法变更记录</th>
</tr>
</thead>
<tbody>
<tr>
<td scope="row">2014-06-3</td>
<td><ul class="list-bullet">
<li><p>
苹果全球开发者大会WWDC2014召开发布了苹果最新的开发语言Swift并释放出XCode6 Beta1版本
</li>
</td>
</tr>
</tbody>
</table>