NSRuntime RunLoop

Objective-C总Runtime的那点事儿（一）消息机制

http://www.cocoachina.com/ios/20141018/9960.html

Runtime运行时的那点事儿

http://www.cnblogs.com/xjf125/p/5531791.html

Runtime 那些事儿 二

iOS runtime实用篇：让你快速上手一个项目

深入理解RunLoop

http://blog.ibireme.com/2015/05/18/runloop/#autorelease

runtime详解

http://gcblog.github.io/2016/04/16/runtime%E8%AF%A6%E8%A7%A3/#more

runtime详解

http://www.jianshu.com/p/46dd81402f63

深入理解Objective-C：Category