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CoreAnimation是专门处理动画的，它可以实现强大炫目的动画功能，Core Animation的动画执行过程都是在后台操作的，不会阻塞主线程。需要注意的是Core Animation作用在CALayer上的，并不是UIView
// 创建动画，keyPath是一个路径，代表动画将修改的属性
let basicAnimation = CABasicAnimation(keyPath: "position")
let fromPosition = layer?.position
let toPositon = CGPointMake(200, 200)
basicAnimation.fromValue = NSValue(CGPoint: fromPosition!)
basicAnimation.toValue = NSValue(CGPoint: toPositon)
basicAnimation.duration = 0.5
basicAnimation.repeatCount = MAXFLOAT
basicAnimation.removedOnCompletion = false
basicAnimation.fillMode = kCAFillModeForwards
basicAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseIn)
basicAnimation.autoreverses = true
basicAnimation.beginTime = CACurrentMediaTime() + 5
// 创建动画后 添加到图层上
layer?.addAnimation(basicAnimation, forKey: nil)
这些只是常用的，更多属性进入父类查看。
// 创建位移动画
let animation1 = CABasicAnimation(keyPath: "position")
animation1.byValue = NSValue(CGPoint: CGPointMake(100, 100))
// 创建旋转动画
let animation2 = CABasicAnimation(keyPath: "transform.rotation.z")
animation2.toValue = NSNumber(double: M_PI * 2)
// 创建动画组
let group = CAAnimationGroup()
// 设置一些属性
group.duration = 2.0
group.autoreverses = true
group.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseIn)
group.animations = [animation1, animation2]
group.repeatCount = MAXFLOAT
// 添加动画组
layer?.addAnimation(group, forKey: nil)
注意：动画组中的动画是一起执行的。
// 1、懒加载 只执行一次，并设置动画代理
lazy var animations: [CAAnimation] = {
// 创建位移动画
let animation1 = CABasicAnimation(keyPath: "position")
animation1.byValue = NSValue(CGPoint: CGPointMake(100, 100))
animation1.duration = 1.0
animation1.removedOnCompletion = false
animation1.fillMode = kCAFillModeForwards
animation1.delegate = self
// 创建旋转动画
let animation2 = CABasicAnimation(keyPath: "transform.rotation.z")
animation2.toValue = NSNumber(double: M_PI * 2)
animation2.duration = 1.0
animation2.removedOnCompletion = false
animation2.fillMode = kCAFillModeForwards
animation2.delegate = self
var array = [animation1, animation2]
return array
}()
// 2、添加第一个动画
layer?.addAnimation(animations[0], forKey: nil)
// 3、实现代理方法
// MARK: 动画代理
override func animationDidStart(anim: CAAnimation) {
animations.removeFirst()
}
override func animationDidStop(anim: CAAnimation, finished flag: Bool) {
guard let animation = animations.first else { return }
layer?.addAnimation(animation, forKey: nil)
}
CAKeyframeAnimation-关键帧动画，它有两个重要的属性(二选一)：
// 使用path
let keyframe = CAKeyframeAnimation(keyPath: "position")
// 创建路径
let path = CGPathCreateMutable()
// 移动到原点
CGPathMoveToPoint(path, nil, 50, 100)
// 添加直线路径
CGPathAddLineToPoint(path, nil, 300, 80)
CGPathAddLineToPoint(path, nil, 150, 250)
// 添加曲线
CGPathAddCurveToPoint(path, nil, 49.0, 200, -100, 0, 150, 150)
keyframe.path = path
keyframe.duration = 3.0
layer?.addAnimation(keyframe, forKey: nil)
/* ----------------------------分割线---------------------------- */
// 使用values
let keyframe = CAKeyframeAnimation(keyPath: "position")
// 创建point
let p1 = layer?.position
let p2 = CGPointMake(50, 50)
let p3 = CGPointMake(100, 300)
let p4 = CGPointMake(150, 150)
// 转换成NSValue
let v1 = NSValue(CGPoint: p1!)
let v2 = NSValue(CGPoint: p2)
let v3 = NSValue(CGPoint: p3)
let v4 = NSValue(CGPoint: p4)
let values = [v1, v2, v3, v4]
keyframe.values = values
keyframe.duration = 4.0
layer?.addAnimation(keyframe, forKey: nil)
算法：总时间 / (总帧数 - 1)，也就是说如果指定了3帧、10秒的总时间，10 / (3 - 1) = 5
// 使用values
let keyframe = CAKeyframeAnimation(keyPath: "position")
// 创建point
let p1 = layer?.position
let p2 = CGPointMake(50, 50)
let p3 = CGPointMake(100, 300)
let p4 = CGPointMake(150, 150)
// 转换成NSValue
let v1 = NSValue(CGPoint: p1!)
let v2 = NSValue(CGPoint: p2)
let v3 = NSValue(CGPoint: p3)
let v4 = NSValue(CGPoint: p4)
let values = [v1, v2, v3, v4]
keyframe.values = values
keyframe.duration = 4.0
// 取值在0 ~ 1.0之间
keyframe.keyTimes = [NSNumber(double: 0.0), NSNumber(double: 0.8), NSNumber(double: 1.0), NSNumber(double: 0.2)]
// 每一帧的计算模式
keyframe.calculationMode = kCAAnimationLinear
layer?.addAnimation(keyframe, forKey: nil)
let transition = CATransition()
transition.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseIn)
transition.duration = 0.5
transition.removedOnCompletion = false
transition.fillMode = kCAFillModeForwards
// 过渡类型
transition.type = kCATransitionReveal
// 过渡方向
transition.subtype = kCATransitionFromTop
layer?.addAnimation(transition, forKey: nil)
layer?.backgroundColor = UIColor.blackColor().CGColor
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原文地址：http://www.cnblogs.com/Alex-sk/p/5561430.html
