UISwipeGestureRecognizer 动画

Question

我正在尝试在我的 collectionViewCell 中实现 UISwipeGestureRecognizer，因此当您向左滑动时，单元格会消失。我想要实现的（我找不到方法）是为滑动设置动画，所以当我向左滑动单元格时，它会消失并带有淡入淡出效果。这是我在方法 cellForItemAtindexPath

中的代码

let cSelector = #selector(reset(sender:))
    let UpSwipe = UISwipeGestureRecognizer(target: self, action: cSelector)
    UpSwipe.direction = UISwipeGestureRecognizerDirection.left
    cell.addGestureRecognizer(UpSwipe)

方法

 func reset(sender: UISwipeGestureRecognizer) {

    let cell = sender.view as! UICollectionViewCell
    let i = self.collectionView?.indexPath(for: cell)!.item


    self.messages.remove(at: i!)
    self.collectionView?.reloadData()

}

谢谢！！！

编辑： 我想我找到了一种最简单的方法，但我遇到了一些麻烦。我尝试在单元格中实现 UIPanGestureRecognizer。这是它的样子...

cellForItemAt

let gestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(handlePan(gestureRecognizer:)))
    cell.addGestureRecognizer(gestureRecognizer)

方法

func handlePan(gestureRecognizer: UIPanGestureRecognizer) {
    if gestureRecognizer.state == .began {
        // When the drag is first recognized, you can get the starting coordinates here

    }

    if gestureRecognizer.state == .changed {
        let translation = gestureRecognizer.translation(in: self.view)
        // Translation has both .x and .y values

        if translation.x == translation.x - 100 {
            //Method i putted before
            reset(sender: gestureRecognizer)
        }

        //print(translation.x, translation.y)
    }
}

我正在尝试定位单元格的坐标，所以当它位于单元格左侧的某个点时，单元格会播放某种淡入淡出的动画，然后消失。

有什么帮助吗？？？谢谢！！！

Answer 1

有两种选择可以实现您的目标。

创建自定义布局
通过滑动手势使用 UIView

创建自定义布局
您可以根据您选择的动画创建自定义布局。 Here 是参考。你只需要修改它的动画即可。

通过滑动手势使用 UIView
按照以下步骤操作

在 CollectionView 单元格中添加 UIView（变量名称 - swipeView）并设置 UIView 的背景颜色。
添加滑动手势（左and/or右）到swipeView
使用不同状态的滑动手势（开始、拖动、结束）处理视图滑动以及用户的拖动操作。
当滑动手势结束时，将 swipeView 推出带有动画的单元格（设置它们的 x 位置，使其可以超出单元格框架的边界）
从数组中删除元素并重新加载集合视图。

我希望，通过以上逻辑你可以做你想做的，你可能不需要现成的代码。

Answer 2

所以我尝试了这段代码，对我来说效果很好！

func setupView(){
    // Setting up swipe gesture recognizers
    let swipeUp : UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(userDidSwipeUp(_:)))
    swipeUp.direction = .left

    collectionView?.addGestureRecognizer(swipeUp)

    //let swipeDown : UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(userDidSwipeDown))
    //swipeDown.direction = .right

    //collectionView?.addGestureRecognizer(swipeDown)
}


func getCellAtPoint(_ point: CGPoint) -> ChatMessageCell? {
    // Function for getting item at point. Note optionals as it could be nil
    let indexPath = collectionView?.indexPathForItem(at: point)
    var cell : ChatMessageCell?

    if indexPath != nil {
        cell = collectionView?.cellForItem(at: indexPath!) as? ChatMessageCell
    } else {
        cell = nil
    }

    return cell
}

func userDidSwipeUp(_ gesture : UISwipeGestureRecognizer) {

    let point = gesture.location(in: collectionView)  //collectionview
    let duration = animationDuration()                //0.5

    if(cell == nil){
        cell = getCellAtPoint(point)

        UIView.animate(withDuration: duration, animations: {
            //self.activeCell.myCellView.transform = CGAffineTransform(translationX: 0, y: -self.activeCell.frame.height)
            self.cell.celdaNormal.transform = CGAffineTransform(translationX: -self.cell.frame.width , y: 0)

        })

    }  else {
        // Getting the cell at the point
        let cell = getCellAtPoint(point)

        // If the cell is the previously swiped cell, or nothing assume its the previously one.
        if cell == nil || cell == cell {
            // To target the cell after that animation I test if the point of the swiping exists inside the now twice as tall cell frame
            let cellFrame = cell?.frame

            var rect = CGRect()

            if cell != nil {
                rect = CGRect(x: (cellFrame?.origin.x)! - (cellFrame?.width)!, y: (cellFrame?.origin.y)!, width: (cellFrame?.width)!*2, height: (cellFrame?.height)!)
            }

            if rect.contains(point) {
                // If swipe point is in the cell delete it

                let indexPath = collectionView?.indexPath(for: cell!)
                messages.remove(at: indexPath!.row)
                collectionView?.deleteItems(at: [indexPath!])

                if messages.count == 0 {
                    reusableView.etiqueta.isHidden = true
                }
            }
            // If another cell is swiped
        }
}

func animationDuration() -> Double {
    return 0.5
}

您所要做的就是在 viewDidLoad 中调用 setupView()，就是这样！我不得不提到我修改了这个问题的代码......

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