collectionView cell not working in tapGestureRecognizer function - swift

Question

I want to change a cell label text when I click/tap on a collectionView cell.
I tried the following way, but this not working.
#objc func tap(_ sender: UITapGestureRecognizer) {
let location = sender.location(in: self.collectionView)
let indexPath = self.collectionView.indexPathForItem(at: location)
if let index = indexPath {
let subL = zoneDict?.sublevel[index.row]
if (subL?.sublevel.count)! > 0 {
DispatchQueue.main.async {
self.zoneDict = subL!
print("self.zoneDict --\(self.zoneDict!)")
let cell = self.collectionView.dequeueReusableCell(withReuseIdentifier: "colViewCell", for: index) as! CollectionViewCell
cell.zoneNameLabel.text = self.zoneDict?.name // Cannot update the text label. It show the default value
print("zone name-- \(self.zoneDict?.name)") // Its print the result.
}
self.delegate?.selectedZoneWithCellItems(items: "cell")
}
}
}

Answer 1

I think when you tap collectionViewCell then iOS system default call function didSelectItemAtIndexPath of CollectionView so that you must handle default event selected cell by the way register UITapGestureRecognizer for your cell and after that you must set property of view (isUserInteractionEnabled = true).
For example: self.yourview.isUserInteractionEnabled = true

Answer 2

you can use this in the VC containing the collection view
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = segmentCollectionView.dequeueReusableCell(withReuseIdentifier: SegmentCellId, for: indexPath) as! CollectionViewCell
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(printHello))
cell.addGestureRecognizer(tapGesture)
return cell
}
#objc func printHello(){
print("Hello")
}

Answer 3

You can use its delegate method in this way to change the cell label text when clicked on cell: -> Here I am using two arrays to update the text of the label as an example:
//Variables that are used below.
let nameCapitalArr1 = ["ABC", "DFG", "EFG", "HIJ", "KLM", "NOP", "QRS", "TUV", "WXY", "Z"]
let nameSmallArr2 = ["abc", "dfg", "efg", "hij", "klm", "nop", "qrs", "tuv", "wxy", "z"]
var changeFlag: Bool = false
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return nameCapitalArr1.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "LabelTextCollectionViewCell", for: indexPath) as? LabelTextCollectionViewCell else { return UICollectionViewCell() }
cell.nameTextLabel.text = !changeFlag ? nameCapitalArr1[indexPath.row] : nameSmallArr2[indexPath.row]
return cell
}
/*That method is called when tapping on the cell and reload that particular cell and also change the label text.*/
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
changeFlag = !changeFlag
collectionView.reloadItems(at: [indexPath])
}
Output: -> Its reflect the cell text with capital to small array values while tapping on the cell with toggle effect.