适用于iphone的coco2d游戏中心集成

我有此代码用于在视图中显示排行榜

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每件事都很好，它显示了排行榜，当我点击“完成”按钮时，它会消失，但当我点击“游戏中心”按钮时，排行榜就不会出来了，我们也无法浏览其他页面

我上面的代码有什么问题，这是针对iphone cocos2d应用程序的

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提前感谢。

我在cocos2D游戏中使用了这段代码，效果很好

-(void)displayLeaderboard
{
    GKLeaderboardViewController *leaderboardViewController = [[GKLeaderboardViewController alloc] init];
    leaderboardViewController.leaderboardDelegate = self;

    AppController *app = (AppController*) [[UIApplication sharedApplication] delegate];

    [app.navController presentModalViewController:leaderboardViewController animated:YES];
}


#pragma mark GameKit delegate

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

-(void) leaderboardViewControllerDidFinish:(GKLeaderboardViewController *)viewController
{
    AppController *app = (AppController*) [[UIApplication sharedApplication] delegate];
    [app.navController dismissModalViewControllerAnimated:YES];
}

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我在cocos2D游戏中使用了这个代码，效果很好

-(void)displayLeaderboard
{
    GKLeaderboardViewController *leaderboardViewController = [[GKLeaderboardViewController alloc] init];
    leaderboardViewController.leaderboardDelegate = self;

    AppController *app = (AppController*) [[UIApplication sharedApplication] delegate];

    [app.navController presentModalViewController:leaderboardViewController animated:YES];
}


#pragma mark GameKit delegate

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

-(void) leaderboardViewControllerDidFinish:(GKLeaderboardViewController *)viewController
{
    AppController *app = (AppController*) [[UIApplication sharedApplication] delegate];
    [app.navController dismissModalViewControllerAnimated:YES];
}

-(void)displayLeaderboard
{
    GKLeaderboardViewController *leaderboardViewController = [[GKLeaderboardViewController alloc] init];
    leaderboardViewController.leaderboardDelegate = self;

    AppController *app = (AppController*) [[UIApplication sharedApplication] delegate];

    [app.navController presentModalViewController:leaderboardViewController animated:YES];
}


#pragma mark GameKit delegate

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

-(void) leaderboardViewControllerDidFinish:(GKLeaderboardViewController *)viewController
{
    AppController *app = (AppController*) [[UIApplication sharedApplication] delegate];
    [app.navController dismissModalViewControllerAnimated:YES];
}