Integrate Gamecenter in cocos2d game - cocos2d-iphone

Question

Is there any one who knows how to integrate game center in Cocos2d.
Please tell me steps so i can integrate that in my Game.

Answer 1

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);
}

Answer 2

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

Answer 3

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.