Update model through UIButton within a UITableViewCell - ios

Question

In MainVC.swift I'm capturing the tag of my custom "PlayerCell". I want to press theincreaseBtn (UIButton) which will increment the playerLbl.text (UILabel) by one but also update my model (PlayerStore.player.playerScore: Int)
Main.swift:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if let cell = tableView.dequeueReusableCell(withIdentifier: "PlayerCell", for: indexPath) as? PlayerCell {
let player = players[indexPath.row]
cell.updateUI(player: player)
cell.increaseBtn.tag = indexPath.row
cell.decreaseBtn.tag = indexPath.row
return cell
} else {
return UITableViewCell()
}
}
PlayerCell.swift
class PlayerCell: UITableViewCell {
#IBOutlet weak var playerLbl: UILabel!
#IBOutlet weak var increaseBtn: UIButton!
#IBOutlet weak var decreaseBtn: UIButton!
#IBOutlet weak var scoreLbl: UILabel!
#IBOutlet weak var cellContentView: UIView!
func updateUI(player: Player){
playerLbl.text = player.playerName
scoreLbl.text = "\(player.playerScore)"
cellContentView.backgroundColor = player.playerColor.color
}
#IBAction func increaseBtnPressed(_ sender: AnyObject) {
let tag = sender.tag
// TODO: send this tag back to MainVC?
}

Answer 1

I would use the delegate pattern in this case. Create a protocol that Main.swift implements, and that PlayerCell.swift uses as an optional property. So for example:
protocol PlayerIncrementor {
func increment(by: Int)
func decrement(by: Int)
}
Then use an extension on Main.swift to implement this protocol
extension Main: PlayerIncrementor {
func increment(by: int) {
//not 100% what you wanted to do with the value here, but this is where you would do something - in this case incrementing what was identified as your model
PlayerStore.player.playerScore += by
}
}
Inside of PlayerCell.swift, add a delegate property and call the delegate increment method in your #IBAction
class PlayerCell: UITableViewCell {
var delegate: PlayerIncrementor?
#IBOutlet weak var increaseBtn: UIButton!
#IBAction func increaseBtnPressed(_ sender: AnyObject) {
let tag = sender.tag
//call the delegate method with the amount you want to increment
delegate?.increment(by: tag)
}
Lastly - to make it all work, assign Main as the delegate to the PlayerCell UITableViewCell.
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if let cell = tableView.dequeueReusableCell(withIdentifier: "PlayerCell", for: indexPath) as? PlayerCell {
//self, in this case is Main - which now implements PlayerIncrementor
cell.delegate = self
//etc