选择器获取 indexPath UICollectionView Swift 3.0

Question

我试图在单元格被点击两次时得到 indexPath。我像这样在 Selector 中传递参数，但它给出了错误。正确的格式是什么？

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)

您不能传递 selector 或 UIGestureRecognizer 的其他实例，您唯一可以传递的实例是 UI(Tap)GestureRecognizer。如果您想要该单元格的 indexPath，您可以这样尝试。首先像这样设置 TapGesture 的 selector。

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

现在的方法应该是这样的：

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

编辑： 如果您想 show/hide 在单元格上双击图像，那么您需要使用单元格的 indexPath 来处理它，因为第一次声明IndexPath 的一个实例并在 cellForItemAt indexPath.

中使用它

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
}

现在在 UITapGestureRecognizer 的 doubleTapped 操作上设置 selectedIndexPath。

func doubleTapped(sender: UITapGestureRecognizer) {
    if let cell = sender.view as? SubOptionsCollectionViewCell, let indexPath = self.collectionView.indexPath(for: cell) {
         if self.selectedIndexPaths == indexPath {
             cell.subOptionSelected.isHidden = true
             self.selectedIndexPaths = IndexPath()
         }
         else {
             cell.subOptionSelected.isHidden = false
             self.selectedIndexPaths = indexPath
         }           
    }       
}

Answer 2

需要这样添加Selector

let tap = UITapGestureRecognizer(target: self, action: #selector(YourViewControllerName.doubleTapped(_:)))
subOptioncell.addGestureRecognizer(tap)

Answer 3

您的情况下正确的选择器是 doubleTapped:。即

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

中任意设置 object.parameter

Answer 4

将您的代码更改为。

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

和函数到。

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

Answer 5

在您的数据源方法中

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)")
}

编码愉快！！！

选择器获取 indexPath UICollectionView Swift 3.0

Selector to get indexPath UICollectionView Swift 3.0

ios

uitapgesturerecognizer

uicollectionviewcell

swift

swift3

应该是：

而不是：