isHighlighted and isSelected didSet only called for UICollectionViewCell not UITableViewCell - ios

Question

I want to apply some style changes to a custom table view cell on highlight/select so am overriding isHighlighted and isSelected to achieve this. It works for my custom collection view cells but not when I tap on the custom table view cells.
I set up the exact same scenario for a table view and collection view and implemented the following on the custom cells:
override var isHighlighted: Bool {
didSet {
//called when I tap for CustomCollectionViewCell not for CustomTableViewCell
}
}
override var isSelected: Bool {
didSet {
//called when I tap for CustomCollectionViewCell not for CustomTableViewCell
}
}
What am I missing here? Why doesn't the table view cell did set get called when it's tapped? This happens for any table view I try with regardless of the content of the custom cell.

Answer 1

The other answer did not work for me. I reckon the reason is that UITableViewCell.isSelected setter is never called when the containing UITableView handles selection, that state is passed via func setSelected(_ selected: Bool, animated: Bool) instead. This means that overriding this function in your UITableViewCell subclass instead of the setter works:
override func setSelected(_ selected: Bool, animated: Bool) {
// implementation that was meant to be in `isSelected` `didSet`
}

Answer 2

By overriding these properties this way, you are no longer using their default implementations.
Try relaying information to super:
override var isHighlighted: Bool {
get {
return super.isHighlighted
}
set {
//do something
super.isHighlighted = newValue
}
override var isSelected: Bool {
get {
return super.isSelected
}
set {
//do something
super.isSelected = newValue
}
}

Answer 3

In my case, I want to change the background of the button in other words the background of the cell in the collection view:
class CustomCVCell: UICollectionViewCell {
override var isSelected: Bool {
didSet {
grayBackgroundViewWithImage.image =
isSelected ? UIImage(named: "") : UIImage()
}
}
In the main class where the collection view is stored create this variable:
class CustomViewController: UIViewController {
///save the indexPath of last selected cell
private var lastSelectedIndexPath: IndexPath? }
In viewDidLoad() set this value to false:
customCollectionView.allowsMultipleSelection = false
Further code in data source. In my case, the first cell should be is selected:
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: CustomCVCell.cellID(),
for: indexPath) as! CustomCVCell
if indexPath.row == 0 {
lastSelectedIndexPath = indexPath
cell.isSelected = true
}
//update last select state from lastSelectedIndexPath
cell.isSelected = (lastSelectedIndexPath == indexPath)
return cell
}
Further code in the delegate:
///UICollectionViewDelegate
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
guard lastSelectedIndexPath != indexPath else { return }
if let index = lastSelectedIndexPath {
let cell = collectionView.cellForItem(at: index) as! CustomCVCell
cell.isSelected = false
}
let cell = collectionView.cellForItem(at: indexPath) as! CustomCVCell
cell.isSelected = true
lastSelectedIndexPath = indexPath
}