参考这几个牛博就好：
http://feihu.me/blog/2015/trigger-condition-of-events-for-uibutton/
https://www.jianshu.com/p/c87428eb576c
http://www.cnblogs.com/niit-soft-518/p/4228701.html
https://www.jianshu.com/p/f7b716b5bb31
参考这几个牛博就好：
http://feihu.me/blog/2015/trigger-condition-of-events-for-uibutton/
https://www.jianshu.com/p/c87428eb576c
http://www.cnblogs.com/niit-soft-518/p/4228701.html
https://www.jianshu.com/p/f7b716b5bb31
本文标题：UIButton 的各种事件
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