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2014-06-10 20:07:44 +08:00
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chapter3/06_Attributes.html
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<div class="book" data-level="3.7" data-basepath=".." data-revision="1402397411238">
<div class="book" data-level="3.7" data-basepath=".." data-revision="1402402017737">
<div class="book-header">
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<a href="#" class="btn pull-left toggle-summary" aria-label="Toggle summary"><i class="fa fa-align-justify"></i></a>
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<div class="page-inner">
<section class="normal" id="section-gitbook_51">
<section class="normal" id="section-gitbook_68">
<h1 id="-">特性</h1>
<hr>
<p>特性提供了关于声明和类型的更多信息。在Swift中有两类特性，用于修饰声明的以及用于修饰类型的。例如，<code>required</code>特性，当应用于一个类的指定或便利初始化器声明时，表明它的每个子类都必须实现那个初始化器。再比如<code>noreturn</code>特性，当应用于函数或方法类型时，表明该函数或方法不会返回到它的调用者。</p>
<p>通过以下方式指定一个特性：符号<code>@</code>后面跟特性名，如果包含参数，则把参数带上：</p>
<pre><code>@attribute name