解决方法
这是一个很棒的帖子:
http://tumbljack.com/post/179975074/complex-interpolation-with-cashapelayer-free
http://tumbljack.com/post/179975074/complex-interpolation-with-cashapelayer-free
一般来说,这是重复的:
Animating a shape with CoreAnimation
干杯
俄德