iOS 13.x 中的重复/自动反转动画

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
}

但是，现在有一条弃用消息UIView.setAnimationRepeatCount and UIView.setAnimationRepeatAutoreverses。有谁知道他们被替换成什么了吗？我还能使用吗UIViewPropertyAnimator，或者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

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)

对于所有可能的调用，您可以检查这个链接 https://developer.apple.com/documentation/uikit/uiview/1622418-animate

另外，如果你确实需要UIViewPropertyAnimator， 它有一个类似的初始化 https://developer.apple.com/documentation/uikit/uiviewpropertyanimator/1648367-runningpropertyanimator:

 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
})