Swift

1，CABasicAnimation类只有三个属性：

fromValue：开始值

toValue：结束值

Duration：动画的时间

2，通过animationWithKeyPath键值对的方式设置不同的动画效果

transform.scale

transform.scale.x

transform.scale.y

transform.rotation.z

opacity

margin

zPosition

backgroundColor

cornerRadius

borderWidth

bounds

contents

contentsRect

cornerRadius

frame

hidden

mask

masksToBounds

opacity

position

shadowColor

shadowOffset

shadowOpacity

shadowRadius

3，使用样例

（1）改变透明度动画（逐渐消失）

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let animation = CABasicAnimation(keyPath: "opacity") animation.fromValue = 1.0 animation.toValue = 0.0 animation.duration = 3.0 self.imageView.layer.addAnimation(animation, forKey: "Image-opacity") self.imageView.alpha = 0

（2）从小变大动画（还原为默认尺寸）

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let animation = CABasicAnimation(keyPath: "bounds.size") animation.fromValue = NSValue(CGSize: CGSizeMake(2.0, 2.0)) animation.toValue = NSValue(CGSize: self.imageView.frame.size) animation.duration = 3.0 self.imageView.layer.addAnimation(animation, forKey: "Image-expend")