CAMediaTimingFunction相关

一：Animation Timing Curves

1：Linear Animation Timing

2：Ease-In Animation Timing

3:Ease-Out Animation Timing

4:Ease-In Ease-Out Animation Timing

5:Custom Animation Timing

自定义动画执行曲线设置

We create a custom timing with the initWithControlPoints:::: method on CAMediaTimingFunction like this:

- (CAMediaTimingFunction *)getTimingFunction {
 CGFloat c1x = 0.5;
 CGFloat c1y = 1.0;
 CGFloat c2x = 0.5;
 CGFloat c2y = 0.0;
 return [[CAMediaTimingFunction alloc initWithControlPoints:cx1 :cy1 :cx2 :cy2];
}

写道

Since the initial and final values are already known (recall that they are {0, 0} and {1, 1}, respectively), we have to specify only the control
points. In our example, we set the first control point to {0.5, 1.0} and the second control point to {0.5, 0.0}.

来源：http://o0o0o0o.iteye.com/blog/838547