change variables from an other view controller when a textField is changed - ios

Question

I'm trying to change the values of a variable in two different view controllers from the value of a textField but I don't understand how to use the delegate so that it works.
My Storyboard:
My Code:
MainView:
class GameCreatingViewController: UIViewController {
var newGame = Game()
override func viewDidLoad() {
super.viewDidLoad()
newGame = Game()
newGame.playerBook.NumberOfPlayers = 2
if let vc = self.children.first(where: { $0 is PlayersTableViewController }) as? PlayersTableViewController {
vc.currentGame = self.newGame
vc.tableView.reloadData()
}
if let vc = self.children.first(where: { $0 is GameViewController }) as? GameViewController {
vc.currentGame = self.newGame
}
}
func changeName(name: String, number: Int) {
self.newGame.playerBook.players[number].name = name
}
}
tableViewController:
class PlayersTableViewController: UITableViewController, UITextFieldDelegate {
var currentGame = Game()
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "playerCell", for: indexPath) as? PlayerNameTableViewCell else {fatalError("Wrong type of cell")}
// Configure the cell...
cell.playerName.delegate = self
let row = indexPath[1]+1
cell.numberOfPlayer = row
return cell
}
func changeName(name: String, number: Int) {
self.currentGame.playerBook.players[number].name = name
}
}
The Cell:
protocol changeNameDelegate: class {
func changeName(name: String, number: Int)
}
class PlayerNameTableViewCell: UITableViewCell, UITextFieldDelegate {
weak var delegate: changeNameDelegate? = nil
#IBOutlet weak var playerName: UITextField!
var numberOfPlayer: Int = Int()
#IBAction func changeName(_ sender: UITextField) {
delegate?.changeName(name: sender.text!, number: numberOfPlayer)
}
}
It seems like the action from the button executes but the fonctions from the other viewcontrollers don't.

Answer 1

Use the delegate to notify the other viewController.
Make sure isn't nil.
Usually protocols name the first letter is capitalized.
A good practice is to implement protocols in extensions.
Implement the changeNameDelegate protocol.
class PlayersTableViewController: UITableViewController, UITextFieldDelegate, changeNameDelegate {
And in the cell configuration set the delegate.
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "playerCell", for: indexPath) as? PlayerNameTableViewCell else {fatalError("Wrong type of cell")}
// Configure the cell...
cell.playerName.delegate = self
cell.delegate = self // This line is missing.
let row = indexPath[1]+1
cell.numberOfPlayer = row
return cell
}