Stellar
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Published
20 hours ago •
AugustRush
AugustRush
Affine Transform
What are your thought about this?
Oftentimes I need to also animate affine scale. However this one is not supported by stellar. I wrote the following set of extensions to make it uniform with Stellar's syntax.
What are your thoughts? Do you see any systemic issue?
`struct CABasicAnimatedView {
let view: UIView
let animation: CABasicAnimation
}
extension UIView {
func makeAffineUniformScale(from from: CGFloat, to: CGFloat) -> CABasicAnimatedView {
let animation = CABasicAnimation(keyPath: KeyPaths.Transform.scale)
let animatedView = CABasicAnimatedView(view: self, animation: animation)
animatedView.animation.fromValue = from
animatedView.animation.toValue = to
return animatedView
}
}
extension CABasicAnimatedView {
func duration(duration: NSTimeInterval) -> CABasicAnimatedView {
self.animation.duration = duration
return self
}
func timingFunction(timingFunction: CAMediaTimingFunction) -> CABasicAnimatedView {
self.animation.timingFunction = timingFunction
return self
}
func animate() {
CATransaction.begin()
self.view.layer.addAnimation(self.animation, forKey: nil)
CATransaction.commit()
self.view.transform = CGAffineTransformMakeUniformScale(self.animation.toValue as! CGFloat) }
}
func CGAffineTransformMakeUniformScale(scale: CGFloat) -> CGAffineTransform {
return CGAffineTransformMakeScale(scale, scale)
}`
