CALayer CABasicAnimation 组动画的设置，设置动画不回到初始位置

 1   //设置旋转
 2         let rotationAnimation:CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
 3         //rotationAnimation.toValue = CGFloat(M_PI_2) * rotateCount
 4         rotationAnimation.fromValue = CGFloat(M_PI_2) * rotateCount
 5         rotationAnimation.toValue = CGFloat(M_PI_2) * (++rotateCount)
 6         rotationAnimation.removedOnCompletion = false
 7         rotationAnimation.fillMode = kCAFillModeForwards
 8         //设置缩放
 9         let scaleAnimation:CABasicAnimation = CABasicAnimation(keyPath: "transform.scale")
10         if self.rotateCount % 2 == 1 {
11             scaleAnimation.fromValue = 1.0
12             scaleAnimation.toValue = 0.75
13             scaleAnimation.duration = 1.0;

14             scaleAnimation.removedOnCompletion = false
15             scaleAnimation.fillMode = kCAFillModeForwards
//设置 动画不回到起始位置，这两个要一起设置。

16         }
17         //设置动画组
18         let animationGroup:CAAnimationGroup = CAAnimationGroup()
19         animationGroup.duration = 1.0
20         animationGroup.repeatCount = 0
21         animationGroup.animations = [rotationAnimation,scaleAnimation]
22         animationGroup.removedOnCompletion = false
23         animationGroup.fillMode = kCAFillModeForwards
24         //组编动画
25         self.VIDEO.playerLayer.addAnimation(animationGroup, forKey: "animationGroup")