Get index of clicked UICollectionViewCell in UICollectionView Swift - ios

Question

How do I get the index of the "Sheep" I clicked on in a CollectionView made in Xcode with Swift for iOS?
class SheepsOverviewVC:
UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "class", for: indexPath) as! ClassesCollectionCell
if(sheeps.count > 0) {
cell.ClassImageView.image = UIImage(named: sheeps[indexPath.row] as! String)
cell.SheepName.text = names[indexPath.row] as? String
}
return cell
}
I created a Sent Event on the TouchDown via the Gui:
#IBAction func clickingSheep(_ sender: UIButton) {
print("This will show info about the Sheep")
print(sender)
}
But the response I get is from the second print:
<UIButton: 0x7f9a63021d20; frame = (50 50; 136 169); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x60800003d260>>
Probably there is some way to figure out which Sheep was clicked, but how do I get that information?
This is how it looks like (other namings then provided in the post):

Answer 1

One solution is to get the index path of the cell based on the button's location.
#IBAction func clickingSheep(_ sender: UIButton) {
let hitPoint = sender.convert(CGPoint.zero, to: collectionView)
if let indexPath = collectionView.indexPathForItem(at: hitPoint) {
// use indexPath to get needed data
}
}

Answer 2

You can set and check the button property "tag" (if you have the outlet set to the controller)
Here is another easy solution:
Have a new property for the callback.
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "class", for: indexPath) as! ClassesCollectionCell
if(sheeps.count > 0) {
cell.ClassImageView.image = UIImage(named: sheeps[indexPath.row] as! String)
cell.SheepName.text = names[indexPath.row] as? String
}
cell.callBack = { [weak self] collectionViewCell in
let indexPath = collectionView.indexPath(for: collectionViewCell)
self?.doStuffFor(indexPath)
}
return cell
}
and on the cell you can have the ibaction
cell class
//...
var callBack : ((UICollectionViewCell?)->Void)?
//...
#IBAction func action(_ sender: UIButton) {
self.callBack?(self)
}