How to pass value on UIButton click to delegate inside collectionViewCell? - ios

Question

I am learning iOS programming for last few days, so I am new to this tech. I am building simple app where I'm using collection view which has EventCell inside it. Each EventCell has one UIButton and EventCell has uniq value(ID coming from JOSN API response). I need to pass that value to delegate which call new ViewController. I have setup the delegate method which is working correctly, just finding the solution for how to pass value on button click
PS: I am not using storyboard
**EventCell.swift**
lazy var leaderboardButton: UIButton = {
let leaderboardBtn = UIButton(type: .system)
leaderboardBtn.setTitle("LeaderBoard", for: .normal)
leaderboardBtn.addTarget(self, action: #selector(handleLeaderBoardClick), for: .touchUpInside)
leaderboardBtn.tintColor = .white
return leaderboardBtn
}()
weak var delegate: HomeControllerDelegate?
func handleLeaderBoardClick() {
// need to get uniq value and pass here....
delegate?.clickOnLeaderBoard()
}

Answer 1

If you need to pass that ID value to delegate object which is in your case is your ViewController - then you need to modify clickOnLeaderboard function from the HomeControllerDelegate protocol.
Modify it and pass your EventCell's ID as an additional argument to it.
delegate?.clickOnLeaderBoard(cellID)
Also, don't forget to update function signature in view controller class.

Answer 2

In func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) overload
add this:
cell.yourButton.tag = indexPath.row
cell.yourButton.addTarget(self, action: #selector(buttonClicked(sender:)), for: .touchUpInside)
you should have buttonClicked(sender:) in your UIViewController.
buttonClicked(sender:){
tag = sender.tag
// you can use this tag to change your view controller
}

Answer 3

Change your function to include a parameter:
func handleLeaderBoardClick(_ sender: UIButton) {
// need to get uniq value and pass here....
delegate?.clickOnLeaderBoard()
}
Update the selector:
leaderboardBtn.addTarget(self, action: #selector(handleLeaderBoardClick(_:)), for: .touchUpInside)
Now you can perform a comparison between sender and leaderboardButton to see if they're the same.