我试图在单击两次时获取单元格的indexPath.
我在Selector中传递参数,但是它给出了错误.
这是什么格式？
我在Selector中传递参数,但是它给出了错误.
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")
}
解决方法
首先,您将tapGesture添加到collectionView而不是subOptioncell.
它应该是：
subOptioncell.addGestureRecognizer(tap)
代替：
collectionView.addGestureRecognizer(tap)
您无法使用UIGestureRecognizer的选择器传递其他实例,您可以传递的唯一实例是UI(Tap)GestureRecognizer.如果你想要那个单元格的indexPath,你可以尝试这样.首先将TapGesture的选择器设置为这样.
let tap = UITapGestureRecognizer(target: self,action: #selector(doubleTapped(sender:)))
现在的方法应该是：
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,则需要使用单元格的indexPath处理它,因为它首先声明一个IndexPath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操作中设置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
}
}
}
