学习总结

• CADispalyLink

以屏幕刷新率为回调频率的定时器

• UIBezierPath

A path that consists of straight and curved line segments that you can render in your custom views.

CGAffineTransformMakeScale(x,y) 在x y方向实现缩放功能

Defines the anchor point of the layer’s bounds rectangle. Animatable. @property CGPoint anchorPoint;