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RunLoop的作用 #11

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sugite opened this issue Feb 15, 2017 · 0 comments
Open

RunLoop的作用 #11

sugite opened this issue Feb 15, 2017 · 0 comments

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@sugite
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sugite commented Feb 15, 2017

大神你好，我看AsyncDisplayKit的代码的时候，它是直接在display时将displayBlock加入到后台线程执行，然后在RunLoop触发Observer回调时提交block的执行结果，然后调用completeBlock，但是我看YYAsyncLayer好像是在RunLoop触发Observer回调时才在display里面将displayBlock添加到后台线程执行，然后执行完后直接向主线程提交结果，好像跟ASDK不太一样，所以这里感觉有点糊涂，到底为什么要在RunLoop上添加Observer呢，为什么不直接将绘制任务添加到后台线程然后将结果返回给主线程呢？
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