convertPoint:fromView:
把一个点从一个坐标系转换到接收者的坐标系
- (CGPoint)convertPoint:(CGPoint)point fromView:(UIView *)view
UIViewController生命周期
https://www.jianshu.com/p/d60b388b19f5
C API 内存分布, C++与objective-c
http://awhisper.github.io/2016/05/01/%E6%B7%B7%E7%BC%96ObjectiveC/
归档
https://www.jianshu.com/p/9c9cd8e70de4
@private @public
http://blog.csdn.net/baidu_31683691/article/details/52766228
CALayer (resentationLayer(以下简称P)和modelLayer(以下简称M)。presentationLayer负责走路(绘制内容),而modelLayer负责看路(如何绘制))
http://blog.csdn.net/u013282174/article/details/50388546