NSRunLoop

https://www.jianshu.com/p/4263188ed940

http://www.cnblogs.com/xwang/p/3547685.html

iOS NSRunloop详解:

https://www.jianshu.com/p/296f182c8faa

https://www.jianshu.com/p/d71e69b80ae1

https://www.jianshu.com/p/526091342592

https://www.cnblogs.com/ruihaha/p/5813819.html

http://www.cocoachina.com/cms/tags.php?/NSRunLoop/

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