iOS CoreAnimation AnimationWithKeyPath 来改变动画 的Key

可以通过改变animationWithKeyPath来改变动画：

transform.scale = 比例转换
transform.scale.x = 宽的比例转换
transform.scale.y = 高的比例转换
transform.rotation.z = 平面图的旋转
opacity = 透明度
margin
zPosition

backgroundColor 背景颜色
cornerRadius 圆角
borderWidth
bounds
contents
contentsRect
cornerRadius
frame
hidden
mask
masksToBounds
opacity
position
shadowColor
shadowOffset
shadowOpacity
shadowRadius

[objc] view
plain copy1. // Create animation for location change
2. CABasicAnimation *locationAnimation = [CABasicAnimation animationWithKeyPath:@”locations”];
3. locationAnimation.fromValue = gradientMask.locations;
4. locationAnimation.toValue = adjustedLocations;
5. locationAnimation.duration = 0.25;
6.
7. // Create animation for color change
8. CABasicAnimation *colorAnimation = [CABasicAnimation animationWithKeyPath:@”colors”];
9. colorAnimation.fromValue = gradientMask.colors;
10. colorAnimation.toValue = adjustedColo