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2014-06-05 15:02:00 +08:00
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<div class="book" data-level="2.1" data-basepath=".." data-revision="1401943865087">
<div class="book" data-level="2.1" data-basepath=".." data-revision="1401951667606">
<div class="book-header">
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<div class="page-inner">
<section class="normal" id="section-gitbook_8">
<section class="normal" id="section-gitbook_9">
<h1 id="-">基础部分</h1>
<p>Swift 是 iOS 和 OS X 应用开发的一门新语言。然而,如果你有 C 或者 Objective-C 开发经验的话,你会发现 Swift 的很多内容都是你熟悉的。</p>
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<p>请将你的代码中的非执行文本注释成提示或者笔记以方便你将来阅读。Swift 的编译器将会在编译代码时自动忽略掉注释部分。</p>
<p>Swift 中的注释与C 语言的注释非常相似。单行注释以双正斜杠作(//)为起始标记:</p>
<pre><code>// this is a comment
</code></pre><p>你也可以进行多行注释,其起始标记为单个正斜杠后跟随一个星号(/<em>),终止标记为一个星号后跟随单个正斜杠(\</em>/):</p>
</code></pre><p>你也可以进行多行注释,其起始标记为单个正斜杠后跟随一个星号(/*),终止标记为一个星号后跟随单个正斜杠(*/):</p>
<pre><code>/* this is also a comment,
but written over multiple lines */
</code></pre><p>与C 语言多行注释不同的是Swift 的多行注释可以嵌套在其它的多行注释之中。你可以先生成一个多行注释块,然后在这个注释块之中再嵌套成第二个多行注释。终止注释时先插入第二个注释块的终止标记,然后再插入第一个注释块的终止标记:</p>
@ -657,7 +657,11 @@ but written over multiple lines */
/* this is the second, nested multiline comment */
this is the end of the first multiline comment */
</code></pre><p>通过运用嵌套多行注释,你可以快速方便的注释掉一大段代码,即使这段代码之中已经含有了多行注释块。</p>
<h2 id="-">分号</h2>
<p>与其他大部分编程语言不同Swift 并不强制要求你在每条语句的结尾处使用分号(;),当然,你也可以按照你自己的习惯添加分号。有一种情况下必须要用分号,即你打算在同一行内写多条独立的语句:</p>
<pre><code>let cat = &quot;🐱&quot;; println(cat)
// prints &quot;🐱&quot;
</code></pre>
</section>

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<div class="book" data-level="2.2" data-basepath=".." data-revision="1401943865087">
<div class="book" data-level="2.2" data-basepath=".." data-revision="1401951667606">
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<div class="book" data-level="2.3" data-basepath=".." data-revision="1401943865087">
<div class="book" data-level="2.3" data-basepath=".." data-revision="1401951667606">
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<div class="page-inner">
<section class="normal" id="section-gitbook_9">
<section class="normal" id="section-gitbook_10">
<h1 id="-strings-and-characters-">字符串和字符 (Strings and Characters)</h1>
<p><strong>String</strong> 是一个有序的字符集合,例如 &quot;hello, world&quot;, &quot;albatross&quot;。Swift 字符串通过 <strong>String</strong> 类型来表示,也可以表示为 <strong>Character</strong> 类型值的集合。</p>

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<div class="book" data-level="2.4" data-basepath=".." data-revision="1401943865087">
<div class="book" data-level="2.4" data-basepath=".." data-revision="1401951667606">
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<div class="book" data-level="2.5" data-basepath=".." data-revision="1401943865087">
<div class="book" data-level="2.5" data-basepath=".." data-revision="1401951667606">
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<div class="book" data-level="2.6" data-basepath=".." data-revision="1401943865087">
<div class="book" data-level="2.6" data-basepath=".." data-revision="1401951667606">
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<div class="page-inner">
<section class="normal" id="section-gitbook_12">
<section class="normal" id="section-gitbook_13">
<h1 id="-functions-">函数Functions</h1>
<p>函数是用来完成特定任务的独立的代码块。你给一个函数起一个合适的名字,用来标示函数做什么,并且当函数需要执行的时候,这个名字会被“调用”。</p>

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<div class="book" data-level="2.7" data-basepath=".." data-revision="1401943865087">
<div class="book" data-level="2.7" data-basepath=".." data-revision="1401951667606">
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<div class="book" data-level="2.8" data-basepath=".." data-revision="1401943865087">
<div class="book" data-level="2.8" data-basepath=".." data-revision="1401951667606">
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<div class="book" data-level="2.9" data-basepath=".." data-revision="1401943865087">
<div class="book" data-level="2.9" data-basepath=".." data-revision="1401951667606">
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<div class="page-inner">
<section class="normal" id="section-gitbook_16">
<h3 id="-">类和结构体</h3>
</section>
</div>
</div>
</div>

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<div class="book" data-level="2.10" data-basepath=".." data-revision="1401943865087">
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<div class="book" data-level="2.11" data-basepath=".." data-revision="1401943865087">
<div class="book" data-level="2.11" data-basepath=".." data-revision="1401951667606">
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<div class="book" data-level="2.12" data-basepath=".." data-revision="1401943865087">
<div class="book" data-level="2.12" data-basepath=".." data-revision="1401951667606">
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<div class="book" data-level="2.13" data-basepath=".." data-revision="1401943865087">
<div class="book" data-level="2.13" data-basepath=".." data-revision="1401951667606">
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<div class="book" data-level="2.15" data-basepath=".." data-revision="1401943865087">
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<div class="book" data-level="2.16" data-basepath=".." data-revision="1401951667606">
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<div class="book" data-level="2.17" data-basepath=".." data-revision="1401943865087">
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<div class="book" data-level="2.23" data-basepath=".." data-revision="1401943865087">
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<div class="book" data-level="2" data-basepath=".." data-revision="1401943865087">
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<div class="page-inner">
<section class="normal" id="section-gitbook_30">
<section class="normal" id="section-gitbook_31">
<h1 id="swift-">Swift 教程</h1>
<p>本章介绍了 Swift 的各种特性及其使用方法,是全书的核心部分。</p>