IOS Game Center GKLocalPlayerListener

Question

I was trying to implement an event listener in a turn based game so a player can receive when his turn is active or when he is invited by a friend. GKTurnBasedEventHandler is de

Answer 1

I might be a little late, but hopefully it will help someone out there...

This is what I do. According to Apple's documentation I create [my] own method that displays an authentication view when appropriate for [my] app.

    - (void)authenticateLocalUser
    {
        if ([GKLocalPlayer localPlayer].authenticated == NO) {
            __weak typeof(self) weakSelf = self;
            __weak GKLocalPlayer *weakPlayer = [GKLocalPlayer localPlayer];

            weakPlayer.authenticateHandler = ^(UIViewController *viewController, NSError *error) {
                if (viewController != nil) {
                    [weakSelf showAuthenticationDialogWhenReasonable:viewController];
                } else if (weakPlayer.isAuthenticated) {
                    // Player has been authenticated!
                    [weakPlayer registerListener:weakSelf];
                } else {
                    // Should disable Game Center?
                }
            };

        } else {
            // Already authenticated
            [[GKLocalPlayer localPlayer] registerListener:self];
        }
    }


    -(void)showAuthenticationDialogWhenReasonable:(UIViewController *)controller
    {
        [[[[[UIApplication sharedApplication] delegate] window] rootViewController] presentViewController:controller animated:YES completion:nil];
    }

This code is inside a singleton helper class, it might be simplified if you have it on your own class.