--参考：（官网) https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/Multithreading/Introduction/Introduction.html + (中文翻译) https://www.cocoachina.com/bbs/read.php?tid=87592--参考：（官网) https://developer.apple.com/library/i
阅读背景：
iOS:多线程编程指南(二)--Run Loops
来源：互联网
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