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         ios - 余瓞归的博客
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              <p><i class="fa fa-book"></i> 最新发表<a href="./"></p>


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                    <h1 class="title">
                        <a href="14914440431935.html">Swift中的闭包</a>
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                            发表于：<time datetime="2014-09-21T10:00:43+08:00">2014/9/21</time>

                                <a class='category' href='ios.html'>ios</a> &nbsp;

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                        <p>闭包的概念来自函数编程，很多语言都支持。Swift对闭包的定义可能是最明确易懂的(与js和ruby比较，哈哈)，来看看官方定义。</p>

<blockquote>
<p>闭包是自包含的函数代码块，可以在代码中被传递和使用。<br/>
闭包可以捕获和存储其所在上下文中任意常量和变量的引用。 这就是所谓的闭合并包裹着这些常量和变量，俗称闭包。</p>
</blockquote>

<p>非常明确的指出闭包的实质，一、闭包是可以被传递的代码块，二、闭包可以访问所处上下文(context)中的变量和常量。这里请记住一个词上下文(context), 对于闭包理解十分重要。</p>


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                        我是余瓞归，一个懒惰挑剔的Ruby程序员。现居上海浦东，在一家电子商务公司从事系统架构工作。
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