Delegate returning nil

Question

I'm trying to use a protocol / delegate in swift, and while I'm not getting any errors it seems that my delegate is not being created.

Here is my code

Class 1

import UIKit

protocol GameViewSliding{
    func slideGameView()
}

class GameDetailsViewController: UIViewController {

    var delegate:GameViewSliding?

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func showOptions(sender: AnyObject) {

        println("button pressed")
        println(delegate)
        delegate?.slideGameView()
    }

}

Class 2 that conforms to the protocol

import UIKit

var currentHoleNumber:Int = 0
var parThree = false;
var parFive = false;

class GameViewController: UIViewController,  GameViewSliding{


var gameDetailsVC:GameDetailsViewController = GameDetailsViewController()
    override func viewDidLoad() {
        super.viewDidLoad()

        println("inside the game class")
        gameDetailsVC.delegate = self
    }

    func slideGameView(){
        println("this is from the root controller")
    }

}

The delegate comes back nil, which is why I never get the println from Class2, just not sure why it's nil.

Answer 1

You have to set a reference in your GameViewController to the class GameDetailsViewController when it should be presented and set it's delegate in the following way :

gameDetailsViewController.delegate = self

And with that the delegate it's not nil, of course that set the reference in the prepareForSegue or any other method you use to present the other ViewController.