https://adolsai.com/tag/nsoperation/Recent content in nsoperation on adolsai's echoHugozh-CNThu, 06 Aug 2015 11:04:39 +0800https://adolsai.com/archives/Concurrency-Programming-Guide-3-Operation-Queues.htmlTue, 28 Jul 2015 19:55:00 +0800https://adolsai.com/archives/Concurrency-Programming-Guide-3-Operation-Queues.html<h1 id="operation-queues">Operation Queues</h1> <h2 id="与gcd对比">与<strong>GCD</strong>对比</h2> <ol start="0"> <li> <p>稍微慢一点点，因为是<strong>NSOperation</strong>和<strong>NSOperationQueue</strong>基于<strong>GCD</strong>的(在Mac OS X v10.6 &amp; iOS 4之后<sup id="fnref:1"><a href="#fn:1" class="footnote-ref" role="doc-noteref">1</a></sup>);</p> </li> <li> <p>Operation Queue可以实现operation的dependency功能，使之在制定的operation完成之后再运行。而且指定线程可以在不同的operation queue里跑;</p> </li> <li> <p>可以重用、取消、暂停operation;</p> </li> <li> <p>可以使用<strong>KVO</strong>，方便监控operation的运行状态;</p> </li> <li> <p>Operation既可以直接调用<code>start</code>方法独立运行也可以add到operation queue里面跑;</p> </li> <li> <p>可以使用<code>setCompletionBlock:</code>设置一个operation执行完之后的动作;</p> </li> <li> <p>可以定义operation优先级别<code>setQueuePriority:</code>;</p> </li> </ol>