andre/the-swift-programming-language-in-chinese
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update 03/03

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2014-06-09 21:41:32 +08:00
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chapter2/17_Optional_Chaining.html
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<section class="normal" id="section-gitbook_34">
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<h1 id="optional-chaining">Optional Chaining</h1>
<p>可选链（Optional Chaining）是一种可以请求和调用属性、方法及子脚本的过程，它的自判断性体现于请求或调用的目标当前可能为空（<code>nil</code>）。如果自判断的目标有值，那么调用就会成功；相反，如果选择的目标为空（<code>nil</code>），则这种调用将返回空（<code>nil</code>）。多次请求或调用可以被链接在一起形成一个链，如果任何一个节点为空（<code>nil</code>）将导致整个链失效。</p>