Question

我试图在细胞被点击两次时获得indexPath。我在Selector这样传递参数，但这是错误的。这是什么格式？

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    if  let subOptioncell : SubOptionsCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: subOptionsCVReuseIdentifier, for: indexPath) as! SubOptionsCollectionViewCell

          let imageNamed = "\(customizeOptionSelected[indexPath.row])"
          subOptioncell.subOptionsImage.image = UIImage(named: imageNamed)

          let tap =  UITapGestureRecognizer(target: self, action: #selector(doubleTapped(sender: indexPath)))
          tap.numberOfTapsRequired = 2
          collectionView.addGestureRecognizer(tap)   

          return subOptioncell
    }
}

func doubleTapped(sender: IndexPath) {
    print("Double Tap")
}

Answer 1

首先，您要将tapGesture添加到collectionView而不是subOptioncell。

应该是：

subOptioncell.addGestureRecognizer(tap)

而不是：

collectionView.addGestureRecognizer(tap)

您无法通过selector的{{1}}传递其他实例，您可以传递的唯一实例是UIGestureRecognizer。如果你想要那个单元格的indexPath，你可以尝试这样。首先设置UI(Tap)GestureRecognizer selector这样的TapGesture。

let tap =  UITapGestureRecognizer(target: self, action: #selector(doubleTapped(sender:)))

现在方法应该是：

func doubleTapped(sender: UITapGestureRecognizer) {
    if let cell = sender.view as? SubOptionsCollectionViewCell, let indexPath = self.collectionView.indexPath(for: cell) {
         print(indexPath)
    }       
}

编辑：如果要在单元格双击上显示/隐藏图像，则需要使用indexPath单元格来处理它，因为它首先声明一个{{1}的实例并在IndexPath内使用它。

cellForItemAt indexPath

现在var selectedIndexPaths = IndexPath() func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { //Your code //Now add below code to handle show/hide image cell.subOptionSelected.isHidden = self.selectedIndexPaths != indexPath return cell }的{{1}}动作设置了doubleTapped。

UITapGestureRecognizer

Answer 2

您案例中的正确选择器为doubleTapped:。那是

let tap =  UITapGestureRecognizer(target: self, action: #selector(doubleTapped:))

调用目标方法时，不能触发任意参数。您可以通过

在subOptioncell上设置目标

let tap =  UITapGestureRecognizer(target: subOptioncell, action: #selector(doubleTapped:))

你可以在subOptioncell

中设置你想要的任意对象。参数

Answer 3

您需要像这样添加选择器

@Override
public void onRadioStarted() {
    mTextViewControl = (TextView) findViewById(R.id.textviewControl);
    mTextViewControl.post(new Runnable() {
        @Override
        public void run() {
            mTextViewControl.setText("RADIO STATE : STOPPED.");
        }
    });
}

Answer 4

将您的代码更改为。

let tap =  UITapGestureRecognizer(target: self, action: #selector(doubleTapped(_:)))

和函数。

func doubleTapped(_ sender: AnyObject) {
    print("Double Tap")
}

Answer 5

在您的数据源方法

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
      if let subOptioncell : SubOptionsCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: subOptionsCVReuseIdentifier, for: indexPath) as! SubOptionsCollectionViewCell{
         //... your code
         subOptioncell.addGestureRecognizer(tap)
         return subOptioncell
       }

}

然后在函数cellTapped()

func cellTapped(sender: UITapGestureRecognizer){

    let tapLocation = sender.location(in: yourCollectionView)
    let indexPath : IndexPath = yourCollectionView.indexPathForItem(at: tapLocation)!

    var currentIndex = 0

    if let cell = yourCollectionView.cellForItem(at: indexPath){
        currentIndex = cell.tag
    }

    print("Your Selected Index : \(currentIndex)")
}

快乐编码!!!

选择器获取indexPath UICollectionView Swift 3.0

5 个答案:

应该是：

而不是：