swift - 在 Swift 中添加滑动手势动画

Question

我的应用程序中有一个滑动手势，当您滑动时，它会更改屏幕上的文本。我该如何使它看起来像是滑动到新文本而不是立即更改文本？

Answer 1

你可以做一件事!!!在你的手势 View 后面添加一个 View ，该 View 应该看起来与手势 View 相同(甚至应该有相同的文本)，并且一旦识别手势后，将该 View 带到你的前面手势 View 它应该有旧的文本(不要更新文本)并更新手势 View 的文本，它移动到新添加的 View 后面，只需更改新添加的 View 的框架，以便它提供滑动效果(更改其宽度)一旦完成动画后，将该 View 返回到手势 View 并将其帧更改为之前的值。

检查此示例:

 func handleGesture(sender:UISwipeGestureRecognizer) {
    //bring background view to front
    self.view.bringSubviewToFront(self.backGroundView)
    self.gestureView.userInteractionEnabled = false

    //capture its initialAutolayout constraint
    let backgroundViewSpaceConstarint  = self.backGroundViewLeftSpaceConstraint.constant
    UIView.animateWithDuration(2, animations: { [unowned self]() -> Void in
        self.someRandomValue++

        // update text label in gesture view which is behind background View
        self.gestureViewTextLabel.text = "swiped \(self.someRandomValue) times"

        //slide backgroundView in required direction by using autolayout
        self.backGroundViewLeftSpaceConstraint.constant = self.backGroundView.bounds.size.width
        self.backGroundView.layoutIfNeeded()
        }) { [unowned self](completion:Bool) -> Void in
            //after animation complition bring gesture view to the front.
            self.backgroundTextLabel.text =  "swiped \(self.someRandomValue) times"
            self.gestureView.userInteractionEnabled = true

            //upadte background view so that it will look the same for next swipe
            self.backGroundViewLeftSpaceConstraint.constant = backgroundViewSpaceConstarint
            //send the background view behind gesture view
            self.view.sendSubviewToBack(self.backGroundView)
          }
  }