问题
I'm trying to get indexPath
on the cell when it is tapped twice.
I'm passing arguments in Selector
like this but it is giving error.
What is the correct format for this ?
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")
}
回答1:
First of all you are adding tapGesture to collectionView
instead of subOptioncell
.
It should be:
subOptioncell.addGestureRecognizer(tap)
Instead of:
collectionView.addGestureRecognizer(tap)
You cannot pass other instance with selector
of UIGestureRecognizer
, the only instance you can pass is UI(Tap)GestureRecognizer
. If you want the indexPath of that cell you can try like this. First of all set your selector
of TapGesture
like this.
let tap = UITapGestureRecognizer(target: self, action: #selector(doubleTapped(sender:)))
Now method should be like:
func doubleTapped(sender: UITapGestureRecognizer) {
if let cell = sender.view as? SubOptionsCollectionViewCell, let indexPath = self.collectionView.indexPath(for: cell) {
print(indexPath)
}
}
Edit: If you want to show/hide image on cell double tap then you need to handle it using indexPath
of cell, for that first declare one instance of IndexPath
and use it inside cellForItemAt indexPath
.
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
}
Now on doubleTapped
action of UITapGestureRecognizer
set the 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
}
}
}
回答2:
The correct selector in your case is doubleTapped:
. That is
let tap = UITapGestureRecognizer(target: self, action: #selector(doubleTapped:))
You can not fire arbitrary parameter when the target method is called. You can set target on subOptioncell
by
let tap = UITapGestureRecognizer(target: subOptioncell, action: #selector(doubleTapped:))
And you can set whatever arbitrary object.parameter you want in subOptioncell
回答3:
You need to add Selector like this way
let tap = UITapGestureRecognizer(target: self, action: #selector(YourViewControllerName.doubleTapped(_:)))
subOptioncell.addGestureRecognizer(tap)
回答4:
Change your code to.
let tap = UITapGestureRecognizer(target: self, action: #selector(doubleTapped(_:)))
and the function to.
func doubleTapped(_ sender: AnyObject) {
print("Double Tap")
}
回答5:
At your Datasource method
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
}
}
Then at the function 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)")
}
Happy Coding!!!
来源:https://stackoverflow.com/questions/41259366/selector-to-get-indexpath-uicollectionview-swift-3-0