How to show a specific UIViewController when GKGameCenterViewController is dismissed?

Question

I am presenting a GKGameCenterViewController in an SKScene that inherits from the following protocol.

protocol GameCenter {}
extension GameCenter where Self: SKScene {

    func goToLeaderboard() {
        let vc = GKGameCenterViewController()
        vc.gameCenterDelegate = GameViewController()
        vc.viewState = .leaderboards
        vc.leaderboardIdentifier = "leaderboard"
        view?.window?.rootViewController?.present(vc, animated: true, completion: nil)
    }
    
}

While the GKGameCenterViewController shows up perfect, when I try to dismiss by clicking the X in the top right corner, nothing happens. I assume this is because the reference to my original GameViewController has been deallocated. How can I get this dismissal to work?

Answer 1

In order to present the GKGameCenterViewController on a SKScene, I needed to find the currently displayed UIViewController reference and set this as the delegate. Here is the code I used and it works:

protocol GameCenter {}
extension GameCenter where Self: SKScene {
    
    func goToLeaderboard() {
        var currentViewController:UIViewController=UIApplication.shared.keyWindow!.rootViewController!
        let vc = GKGameCenterViewController()
        vc.gameCenterDelegate = currentViewController as! GKGameCenterControllerDelegate
        vc.viewState = .leaderboards
        vc.leaderboardIdentifier = "leaderboard"
        currentViewController.present(vc, animated: true, completion: nil)
    }
}