Swift 5.4 UIImage 动画：如何从弹跳UIViewAnimate切换到拖动UIPanGestureRecognizer

如何解决Swift 5.4 UIImage 动画：如何从弹跳UIViewAnimate切换到拖动UIPanGestureRecognizer

我有一个 UIImageView。

我可以使用 animate 让它弹跳：

        self.myImage.frame = CGRect(x: myImage.center.x,y: myImage.center.y,width: 50,height: 70)
        UIView.animate(withDuration: 0.4,delay: 0,options: [.repeat,.autoreverse],animations: {
            self.myImage.frame = CGRect(x: self.myImage.center.x,y: self.myImage.center.y,width: 70,height: 80);
            }) { (completed) in  }

或者，我可以使用 panGestureRecogniser 拖动它：

    @IBAction func dragView(_ sender: UIPanGestureRecognizer) {
            let translation = sender.translation(in: self.view)
            if let viewToDrag = sender.view {
                viewToDrag.center = CGPoint(x: viewToDrag.center.x + translation.x,y: viewToDrag.center.y + translation.y)
                sender.setTranslation(.zero,in: viewToDrag)
            }

如何从先弹跳然后切换到拖动？

解决方法

在设置动画时将 .allowUserInteraction 添加到您的选项中

self.myImage.frame = CGRect(x: myImage.center.x,y: myImage.center.y,width: 50,height: 70)
UIView.animate(withDuration: 0.4,delay: 0,options: [.repeat,.autoreverse,.allowUserInteraction],animations: {
  self.myImage.frame = CGRect(x: self.myImage.center.x,y: self.myImage.center.y,width: 70,height: 80);
  }) { (completed) in  }

编辑： 要打破弹跳动画循环，请在平移手势的开始状态使用 self.myImage.layer.removeAllAnimations()，如下所示：

@IBAction func dragView(_ sender: UIPanGestureRecognizer) {
            let translation = sender.translation(in: self.view)
            if let viewToDrag = sender.view {
                if sender.state == .began {
                   viewToDrag.layer.removeAllAnimations()
                }
                viewToDrag.center = CGPoint(x: viewToDrag.center.x + translation.x,y: viewToDrag.center.y + translation.y)
                sender.setTranslation(.zero,in: viewToDrag)
            }