Swift UILabel Subview not updating - ios

Question

I have a header of a UICollectionView. This header contains a UILabel. I'm updating the text value of the label by calling a function updateClue through a delegate.
class LetterTileHeader: UICollectionViewCell {
override init(frame: CGRect) {
super.init(frame: frame)
setupViews()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
var clueLabel: UILabel = {
let label = UILabel()
label.font = UIFont.systemFont(ofSize: 16)
label.text = "HELLO"
label.textColor = UIColor.white
label.translatesAutoresizingMaskIntoConstraints = false
return label
}()
func setupViews() {
backgroundColor = GlobalConstants.colorDarkBlue
addSubview(clueLabel)
clueLabel.topAnchor.constraint(equalTo: self.topAnchor).isActive = true
clueLabel.rightAnchor.constraint(equalTo: self.rightAnchor).isActive = true
clueLabel.bottomAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
clueLabel.leftAnchor.constraint(equalTo: self.leftAnchor).isActive = true
}
func updateClue(clue: String) {
clueLabel.text = clue
debugLabel()
}
func debugLabel() {
print(clueLabel.text)
}
The function debugLabel is printing with the changed text coming from updateClue. But the label on the screen does not update. What am I missing? I've tried using a DispatchQueue.main.async block with changing the label text within that but no still no change.
UpdateClue function is triggered from another class via a Protocol Delegation.
extension PuzzleViewController: WordTileDelegate {
func relaySelectedWordId(wordId: String!) {
selectableTiles.updateTileHeaderClue(wordId: wordId)
}
}
Thanks.
UPDATE:
I've figured out what's going on. This subview is created each time I select a new cell. Looking into why that's happening. Will update soon.
The issue I'm having is due to this cell class being initialized multiple times. I believe the label I'm seeing is not the current one being updated, but the previous label that was instantiated. I have a new issue though which I may open a question on if I can't figure it out.

Answer 1

You have two UILabels and/or two LetterTileHeaders. The one you are updating is not the one that is being displayed on the screen.
One way to prove this is to put a breakpoint on the line after let label = UILabel(). It is very likely that the breakpoint will be hit more than once.
Another way would be to look at the screen layout in the debugger and find the memory location of the UILabel that is getting displayed, then put a breakpoint in the updateClue method and compare that label's memory location to the one that is being displayed on the screen.

Answer 2

Follow code seems to be wrong, this mean each time when you use clueLble it will give you fresh UILable instance.
var clueLabel: UILabel = {
let label = UILabel()
label.font = UIFont.systemFont(ofSize: 16)
label.text = "HELLO"
label.textColor = UIColor.white
label.translatesAutoresizingMaskIntoConstraints = false
return label
}()
Try doing this :
just replace above code with
var clueLabel = UILabel()
Add following func:
override func awakeFromNib() {
super.awakeFromNib()
label.font = UIFont.systemFont(ofSize: 16)
label.text = "HELLO"
label.textColor = UIColor.white
label.translatesAutoresizingMaskIntoConstraints = false
backgroundColor = GlobalConstants.colorDarkBlue
addSubview(clueLabel)
clueLabel.topAnchor.constraint(equalTo: self.topAnchor).isActive = true
clueLabel.rightAnchor.constraint(equalTo: self.rightAnchor).isActive = true
clueLabel.bottomAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
clueLabel.leftAnchor.constraint(equalTo: self.leftAnchor).isActive = true
}
remove setupViews()