Integrate Gamecenter in cocos2d game

Is there any one who knows how to integra开发者_开发问答te game center in Cocos2d. Please tell me steps so i can integrate that in my Game.

UPDATE:

I created my own Helper Class that works with all kind of Apps (also Cocos2D 1 & 2+) https://github.com/alexblunck/ABGameKitHelper

Hi I suggest you use GKHelper Class from Steffen Itterheim! I uploaded the GKHelper.h / GKHelper.m for you: http://www.cl.ly/7ReW

Then follow these instructions:

//0.0 Add GameKit Framework to Project (Ask If you don't know how to do this ;) )

//0. Change "[window addSubview: viewController.view];" in the AppDelegate.m to: //Do this if you're using any release of cocos2D after 0.99.5:

window.rootViewController = viewController;

//1. Add Gamekithelper.h / .m to project

//2. Include following delegate in given header:

<GameKitHelperProtocol>

//3. Add Delegate Methods to .m

//4. Add GameKitHelper to "Scene":

GameKitHelper *gkHelper = [GameKitHelper sharedGameKitHelper];
gkHelper.delegate = self;
[gkHelper authenticateLocalPlayer];

//Adding score to leaderboard:

GameKitHelper *gkHelper = [GameKitHelper sharedGameKitHelper];
[gkHelper submitScore:scoreValue category:@"LeaderboardID"];

//Adding achievement completion:

GameKitHelper *gkHelper = [GameKitHelper sharedGameKitHelper];
[gkHelper reportAchievementWithID:@"AchievementID" percentComplete:100];

These are the delegate Methods that need to be added mentioned in Step #3:

#pragma mark GameKitHelper delegate methods
-(void) onLocalPlayerAuthenticationChanged
{
    GKLocalPlayer* localPlayer = [GKLocalPlayer localPlayer];
    CCLOG(@"LocalPlayer isAuthenticated changed to: %@", localPlayer.authenticated ? @"YES" : @"NO");

    if (localPlayer.authenticated)
    {
        GameKitHelper* gkHelper = [GameKitHelper sharedGameKitHelper];
        [gkHelper getLocalPlayerFriends];
        //[gkHelper resetAchievements];
    }   
}
-(void) onFriendListReceived:(NSArray*)friends
{
    CCLOG(@"onFriendListReceived: %@", [friends description]);
    GameKitHelper* gkHelper = [GameKitHelper sharedGameKitHelper];
    [gkHelper getPlayerInfo:friends];
}
-(void) onPlayerInfoReceived:(NSArray*)players
{
    CCLOG(@"onPlayerInfoReceived: %@", [players description]);


}
-(void) onScoresSubmitted:(bool)success
{
    CCLOG(@"onScoresSubmitted: %@", success ? @"YES" : @"NO");
}
-(void) onScoresReceived:(NSArray*)scores
{
    CCLOG(@"onScoresReceived: %@", [scores description]);
    GameKitHelper* gkHelper = [GameKitHelper sharedGameKitHelper];
    [gkHelper showAchievements];
}
-(void) onAchievementReported:(GKAchievement*)achievement
{
    CCLOG(@"onAchievementReported: %@", achievement);
}
-(void) onAchievementsLoaded:(NSDictionary*)achievements
{
    CCLOG(@"onLocalPlayerAchievementsLoaded: %@", [achievements description]);
}
-(void) onResetAchievements:(bool)success
{
    CCLOG(@"onResetAchievements: %@", success ? @"YES" : @"NO");
}
-(void) onLeaderboardViewDismissed
{
    CCLOG(@"onLeaderboardViewDismissed");

    GameKitHelper* gkHelper = [GameKitHelper sharedGameKitHelper];
    [gkHelper retrieveTopTenAllTimeGlobalScores];
}
-(void) onAchievementsViewDismissed
{
    CCLOG(@"onAchievementsViewDismissed");
}
-(void) onReceivedMatchmakingActivity:(NSInteger)activity
{
    CCLOG(@"receivedMatchmakingActivity: %i", activity);
}
-(void) onMatchFound:(GKMatch*)match
{
    CCLOG(@"onMatchFound: %@", match);
}
-(void) onPlayersAddedToMatch:(bool)success
{
    CCLOG(@"onPlayersAddedToMatch: %@", success ? @"YES" : @"NO");
}
-(void) onMatchmakingViewDismissed
{
    CCLOG(@"onMatchmakingViewDismissed");
}
-(void) onMatchmakingViewError
{
    CCLOG(@"onMatchmakingViewError");
}
-(void) onPlayerConnected:(NSString*)playerID
{
    CCLOG(@"onPlayerConnected: %@", playerID);
}
-(void) onPlayerDisconnected:(NSString*)playerID
{
    CCLOG(@"onPlayerDisconnected: %@", playerID);
}
-(void) onStartMatch
{
    CCLOG(@"onStartMatch");
}
-(void) onReceivedData:(NSData*)data fromPlayer:(NSString*)playerID
{
    CCLOG(@"onReceivedData: %@ fromPlayer: %@", data, playerID);
}

You can go through with GamKit framework . Game center is very powerful for managing your online game and game score as well . with game center there are two types of game you can create

1: Real time matches (Real time Car racing) 2: Turn Base Matches (Online card game )

I am sharing with you link of RaywenderLich :

Real time match : http://www.raywenderlich.com/3276/game-center-tutorial-for-ios-how-to-make-a-simple-multiplayer-game-part-12

Turn Based Match http://www.raywenderlich.com/5480/beginning-turn-based-gaming-with-ios-5-part-1

Although Alexander Blunck's answer is reasonable, for earlier versions of iOS (such as 3.2) the following line will fault, which is not what you want.

window.rootViewController = viewController;

If you are going to use Steffen's code (ugh) then you might want to add a method to set the ui view controller directly rather than having it assume it can be grabbed via UIApplication.