面试——UIView

一下是几篇关于UIview callayer

一，iOS UIView & CALayer

https://www.jianshu.com/p/f03c126f8e7d 

二， hitTest:withEvent:方法流程

http://blog.csdn.net/jiajiayouba/article/details/23447145 

https://www.jianshu.com/p/d8512dff2b3e 

https://www.jianshu.com/p/1fd428d6ca0e 

三，iOS-UIView常用的setNeedsDisplay和setNeedsLayout

https://www.jianshu.com/p/ed3b7c25076a 

 相关demo https://github.com/LuckyZong