iOS 13.x 中的重复/自动反转动画

Question

以前在 swift 中你可以这样做：

let animator = UIViewPropertyAnimator(duration: 0.25, curve: .easeIn) {
  UIView.setAnimationRepeatCount(Float.infinity)
  UIView.setAnimationRepeatAutoreverses(true)
  let transform = CATransform3DIdentity
  let rotate = CATransform3DRotate(transform, 45, 1, 1, 0)
  self.ex.layer.transform = rotate
}

UIView.setAnimationRepeatCount但是，现在和上有一条弃用消息UIView.setAnimationRepeatAutoreverses。有人知道他们被替换成什么了吗？我仍然可以使用UIViewPropertyAnimator，还是我必须去类似的地方CABasicAnimation？

消息是：

iOS 13.0 中已弃用“setAnimationRepeatCount”：改用基于块的动画 API

iOS 13.0 中已弃用“setAnimationRepeatAutoreverses”：改用基于块的动画 API

Answer 1

你可以这样做：

UIView.animate(withDuration: 0.25, delay: 0, options: [.autoreverse, .curveEaseIn, .repeat], animations: {
    let transform = CATransform3DIdentity
    let rotate = CATransform3DRotate(transform, 45, 1, 1, 0)
    self.ex.layer.transform = rotate
}, completion: nil)

对于所有可能的呼叫，您可以查看此链接

另外，如果你确实需要UIViewPropertyAnimator，它有一个类似的 init：

 UIViewPropertyAnimator.runningPropertyAnimator(withDuration: 0.25, delay: 0, options: [.autoreverse, .curveEaseIn, .repeat], animations: {
    let transform = CATransform3DIdentity
    let rotate = CATransform3DRotate(transform, 45, 1, 1, 0)
    self.ex.layer.transform = rotate
})