UICollectionViewCell Deselect Pre-Selected Cell on First Tap - ios

Question

I am modally presenting a viewcontroller that hosts a viewcollection with "pre-selected" cells formatted to a different background color based on data passed on segue.
When I tap on one of these "pre-selected" cells, it takes two taps to trigger the didDeselectItemAt delegate method. I understand why this is happening while debugging, where the cell although of different color is not necessarily recognized in a selected state. Is there any way to trigger didDeselectItemAt first for the "pre-selected" cells?
I've tried, within the delegate method cellForItemAt, to incorporate, as part of a conditional statement that changes the cell background color, setting cell.isSelected = true. Similarly within the same delegate method, I've also tried invoking a function that would invoke the delegate method didSelectItemAt with indexPaths of these "pre-selected" cells. Both produced the same result.
Below is (abbreviated) relevant code snippets:
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath as IndexPath) as! ExampleCollectionViewCell
if preselectedDataPoints { cell.backgroundColor = blue }
else { cell.backgroundColor = white }
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let cell = collectionView.cellForItem(at: indexPath)
cell?.backgroundColor = blue
preselectedDataPoints.append(newDataPoint)
}
func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) {
let cell = collectionView.cellForItem(at: indexPath)
cell?.backgroundColor = white
preselectedDataPoints.remove(at: existingDataPoint)
}

Answer 1

Programatically call collectionView.deselectItem(at: indexPath, animated: true) in didSelectItem if cell is preselected.
Refrer code
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
if preselectedDataPoints {
collectionView.deselectItem(at: indexPath, animated: true)
}else{
let cell = collectionView.cellForItem(at: indexPath)
cell?.backgroundColor = blue
preselectedDataPoints.append(newDataPoint)
}
}
or
Directly call what ever code you need to execute in deSelect method
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
if preselectedDataPoints {
let cell = collectionView.cellForItem(at: indexPath)
cell?.backgroundColor = white
preselectedDataPoints.remove(at: existingDataPoint)
}else{
let cell = collectionView.cellForItem(at: indexPath)
cell?.backgroundColor = blue
preselectedDataPoints.append(newDataPoint)
}
}