Game Center integration with Sprite Kit?

Question

How can I use Game Center or the GameKit Framework with a Sprite Kit Xcode template? In Sprite kit, it uses Scenes; but normally to view the leaderboards for example you need to "presentModalViewController" but that is not possible in SKView.

And how can I authenticate the player and all that other fun stuff in iOS 6.

Thanks in advance!

Answer 1

you can authenticate like this

[[GKLocalPlayer localPlayer] authenticateWithCompletionHandler:^(NSError *error) {
            if (error == nil)
            {
                static_setEnable( true );

                NSLog(@" Authenticate local player complete");

            }
            else
            {
                static_setEnable( false );
                NSLog(@"Authenticate local player Error: %@", [error description]);
            }
        }];
    }

Answer 2

You can use "presentModalViewController" by using this code to access the root view controller

UIViewController *vc = self.view.window.rootViewController;
[vc presentViewController: gameCenterController animated: YES completion:nil];

Now you can access your ModelViewController anywhere include in SKScenes. I did it in my newest game and it worked well

Besides, I suggest you use the separate object to control game center like leaderboard and achievement so you can reuse it in your next game.

Answer 3

Here is an updated authenticate local player, but Ravindra's code also works.

- (void) authenticateLocalPlayer
{
    GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer];
    localPlayer.authenticateHandler = ^(UIViewController *viewController, NSError *error){
        if (viewController != nil)
        {
            //showAuthenticationDialogWhenReasonable: is an example method name. Create your own method that displays an authentication view when appropriate for your app.
            //[self showAuthenticationDialogWhenReasonable: viewController];
        }
        else if (localPlayer.isAuthenticated)
        {
            //authenticatedPlayer: is an example method name. Create your own method that is called after the loacal player is authenticated.
            //[self authenticatedPlayer: localPlayer];
        }
        else
        {
            //[self disableGameCenter];
        }
    };
}

Answer 4

Swift 2.0

 func authenticateLocalPlayer() {

        let localPlayer = GKLocalPlayer.localPlayer()

        localPlayer.authenticateHandler = {  (viewController, error )  -> Void in

            if (viewController != nil) {

                let vc:UIViewController = self.view!.window!.rootViewController!
                vc.presentViewController(viewController!, animated: true, completion:nil)

            } else {


                print ("Authentication is \(GKLocalPlayer.localPlayer().authenticated) ")
                GlobalData.loggedIntoGC = true



                // do something based on the player being logged in.

GlobalData Swift File:

static var loggedIntoGC:Bool = false

Call Method in your scene where Game Center is being enabled: ie HUD or GameScene in the

override func didMoveToView(view: SKView)` 
    authenticateLocalPlayer()