Presenting game center leaderboard

Question

I have the following code:

-(void)showLeaderboard { GKLeaderboardViewController *leaderboardController = [[GKLeaderboardViewController alloc] init]; if (leaderboardController != NULL) { leaderboardController.timeScope = GKLeaderboardTimeScopeAllTime; leaderboardController.leaderboardDelegate = self; [self presentModalViewController: leaderboardController animated: YES]; } [leaderboardController release]; }

Which I am trying to use to make my leader-board pop up. The issue is cocos2d will not allow me to use the line:

 [self presentModalViewController: leaderboardController animated: YES];

How do I fix this?

Thanks

PS I am using cocos2d

You'll need to be more descriptive about your problem for us to help: - In what class are you implementing the method showLeaderboard? - What errors do you get when you run your code? — lemikegao
– lemikegao, Commented Dec 10, 2012 at 3:27

So Much Drama Studios · Accepted Answer · 2012-12-12 14:59:41Z

You can only call [self presentModalViewController...] from a UIViewController (or one of its subclasses). In Cocos2d 2.0, the CCDirector is a subclass of UIViewController, so you can do something like:

[[CCDirector sharedDirector] presentModalViewController...]

(In previous versions of Cocos2d, I think you need to latch back to the RootViewController, but I could be wrong)

BTW, presentModalViewController is now deprecated; you may want to look at the replacement method "presentViewController..." instead.

For earlier versions of Cocos2d, you can either latch onto the OpenGL view:

[CCDirector sharedDirector] openGLView]...

or hook back into the main application delegate:

AppDelegate *app = (AppDelegate *) [[UIApplication sharedApplication] delegate]; [app methodThatDoesWhatIWantItToDo];

\$\begingroup\$ I am using cocos2d 1.0.1 so what should I do? \$\endgroup\$

Coder404
– Coder404

2012-12-12 00:46:10 +00:00
Commented Dec 12, 2012 at 0:46 — Coder404
– Coder404, Commented Dec 12, 2012 at 0:46
\$\begingroup\$ Updated the answer with info for previous versions \$\endgroup\$

So Much Drama Studios
– So Much Drama Studios

2012-12-12 15:00:00 +00:00
Commented Dec 12, 2012 at 15:00 — So Much Drama Studios
– So Much Drama Studios, Commented Dec 12, 2012 at 15:00

Karlos Zafra · Accepted Answer · 2012-12-18 15:41:57Z

You have to implement GKAchievementViewControllerDelegate protocol in your layer or scene.

Declare your layer like this:

@interface MyLayer : CCLayer <GKAchievementViewControllerDelegate>

This will show the game center:

- (void)showAchievements{ NSLog(@"Show achievements!"); AppDelegate *delegate = [UIApplication sharedApplication].delegate; GKAchievementViewController *achievements = [[GKAchievementViewController alloc] init]; if (achievements != NULL) { achievements.achievementDelegate = self; [delegate.viewController presentModalViewController: achievements animated: YES]; } }

And to get back the control when user has finished with GameCenter:

- (void)achievementViewControllerDidFinish: (GKAchievementViewController *)viewController{ AppDelegate *delegate = [UIApplication sharedApplication].delegate; [delegate.viewController dismissModalViewControllerAnimated: YES]; [viewController release]; }

This code works on cocos2d 1.0.1 in iOS 4,5 & 6.

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