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")

设置视频player显示的比例按照视频本身比例显示

 1   func rotateAction(){
 2         let rotationAnimation:CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
 3         rotationAnimation.fromValue = CGFloat(M_PI_2) * rotateCount
 4         rotationAnimation.toValue = CGFloat(M_PI_2) * (++rotateCount)
 5         let scaleAnimation:CABasicAnimation = CABasicAnimation(keyPath: "transform.scale")
 6         if self.rotateCount % 2 == 1 {
 7             scaleAnimation.fromValue = 1.0
 8             let boolCompare =  (self.cast.video_height / self.cast.video_width) >= 1 ? true : false
 9             if self.isLive() {
10                 if  boolCompare  {
11                     scaleAnimation.toValue = (self.VIDEO.width) / (self.VIDEO.height)
12                 } else {
13                     scaleAnimation.toValue = (self.VIDEO.height) / (self.VIDEO.width)
14                 }
15             } else if !self.isIpadCompact(){
16                 if  boolCompare  {
17                     scaleAnimation.toValue = (self.VIDEO.width) / (self.VIDEO.height)
18                 } else {
19                     scaleAnimation.toValue = (self.VIDEO.height) / (self.VIDEO.width)
20                 }
21             } else {
22                 var ratio = (self.VIDEO.height) / (self.VIDEO.width)
23                 if ratio > 2 {
24                     ratio = 1.8
25                 } else if ratio > 1 {
26                     ratio = 1.65
27                 }
28                 scaleAnimation.toValue = ratio
29             }
30             scaleAnimation.duration = 0.2;
31         }
32         let animationGroup:CAAnimationGroup = CAAnimationGroup()
33         animationGroup.duration = 0.2
34         animationGroup.repeatCount = 0
35         animationGroup.animations = [rotationAnimation,scaleAnimation]
36         animationGroup.removedOnCompletion = false
37         animationGroup.fillMode = kCAFillModeForwards
38         self.VIDEO.playerLayer.addAnimation(animationGroup, forKey: "animationGroup")
39     }

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原文地址：https://www.cnblogs.com/741162830qq/p/4935586.html