Question

在我的ViewController视图中添加了平移手势。它必须检测，tapView的哪个单元被轻敲，然后移动它。一切都很好，但有时Pan Gesture抓住了＃34;开始＆＃34;并且＆＃34;改变了＃34;事件并没有捕获任何结束事件（需要捕获＆＃34;结束＆＃34;事件）。我试图捕捉所有事件，但当我伸出手指时 - 没有发生。平移手势在故事板上添加并与动作相关联。

以下是我的行动代码：

    //--------------\\
    var translitionSensitivity : CGFloat = 1.0 
    let thresholdWhenSensitivityWillGrow : CGFloat = self.view.frame.width / 4
    let sensitivityMultiplier : CGFloat = 15 
    let animDuration = 0.4
    //--------------\\


    DispatchQueue.main.async {
        let indexPath = self.getCellAtPoint(sender.location(in: self.view))
        if indexPath == nil { return }

        var cell = self.collectionView.cellForItem(at: indexPath!) as! DetailCardCollectionViewCell
        if self.activeCell != nil { cell = self.activeCell } else {self.activeCell = cell}

        let translation = sender.translation(in: self.collectionView)
        var howMuchOffseted : CGFloat = 0.0

        if sender.state == .began
        {
            self.lastTranslationPos = 0
        }

        if sender.state == .changed
        {
            if cell.mainViewTrailingConstraint.constant >= thresholdWhenSensitivityWillGrow
            {
                translitionSensitivity += (cell.mainViewTrailingConstraint.constant - thresholdWhenSensitivityWillGrow) / sensitivityMultiplier
            }
            else
            {
                translitionSensitivity = 1
            }

            howMuchOffseted = (self.lastTranslationPos - translation.x) / translitionSensitivity
            self.lastTranslationPos = translation.x

            cell.mainViewTrailingConstraint.constant += howMuchOffseted
        }

        if sender.state == .ended || sender.state == .cancelled || sender.state == .failed || sender.state == .possible || sender.state == .recognized
        {
            print("ended")
            if cell.mainViewTrailingConstraint.constant > thresholdWhenSensitivityWillGrow / 2
            {
                cell.mainViewTrailingConstraint.constant = thresholdWhenSensitivityWillGrow
                UIView.animate(withDuration: animDuration, delay: 0.0, options: [.curveEaseOut], animations: {
                    cell.layoutIfNeeded()
                }, completion: nil)
            }
            else
            {
                cell.mainViewTrailingConstraint.constant = 0
                UIView.animate(withDuration: animDuration, delay: 0.0, options: [.curveEaseOut], animations: {
                    cell.layoutIfNeeded()
                }, completion: nil)
            }

            self.activeCell = nil
        }
    }

Answer 1

你为自己制造的东西太难了。使用代码，将平移手势识别器放在视图上，您希望能够拖动（在每个单元格中）。或者，更好的是，将此视图包装在水平滚动视图中，以便它可以自动拖动（因为滚动视图是可滚动的） - 这就是大多数自制刷卡到删除实现的工作方式。

UI Pan Gesture不工作

1 个答案: