Swift - 使用CAKeyframeAnimation实现关键帧动画

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let animation = CAKeyframeAnimation(keyPath: "position")

//设置5个位置点

let p1 = CGPointMake(0.0, 0.0)

let p2 = CGPointMake(300, 0.0)

let p3 = CGPointMake(0.0, 400)

let p4 = CGPointMake(300, 400)

let p5 = CGPointMake(150, 200)

//赋值

animation.values = [NSValue(CGPoint: p1), NSValue(CGPoint: p2),

    NSValue(CGPoint: p3), NSValue(CGPoint: p4), NSValue(CGPoint: p5)]

//每个动作的时间百分比

animation.keyTimes = [NSNumber(float: 0.0), NSNumber(float: 0.4),

    NSNumber(float: 0.6), NSNumber(float: 0.8), NSNumber(float: 1.0), ]

animation.delegate = self

animation.duration = 6.0

self.imageView.layer.addAnimation(animation, forKey: "Image-Move")

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animation.delegate = self

override func animationDidStart(anim: CAAnimation!) {

    println("动画开始")

}

override func animationDidStop(anim: CAAnimation!, finished flag: Bool) {

    println("动画结束")

}