ios - 如何旋转.transitionCurlDown动画？

Question

如何旋转.transitionCurlDown动画来获取书页的旋转(水平，而不是垂直)，与此相同:

有垂直翻页动画:

UIView.transition(with: self.myView, duration: 0.7, 
options: .transitionCurlDown, animations: {
})

重要提示:我不想在 UIViewController 或 UIPageController 之间使用过渡，我想在当前屏幕上的 UIView 上应用动画。

Answer 1

解决方案:

func animatePage(side: PageCurl, textView: UITextView) {
    UIView.animate(withDuration: 0.3, animations: {
        let animation = CATransition()
        animation.duration = 0.3
        animation.startProgress = 0.0
        animation.endProgress = 1
        animation.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
        animation.type = CATransitionType(rawValue: "pageCurl")
        if side == .left {
            animation.subtype = CATransitionSubtype(rawValue: "fromLeft")
        } else {
            animation.subtype = CATransitionSubtype(rawValue: "fromRight")
        }
        animation.isRemovedOnCompletion = false
        animation.isRemovedOnCompletion = false
        textView.layer.add(animation, forKey: "pageFlipAnimation")
    })
}

用途:

animatePage(side: .left, textView: myTextView)