iOS展示了特定的排行榜Game Center

如何显示特定的排行榜Game Center？

我的代码是:

    GKGameCenterViewController *gameCenterController = [[GKGameCenterViewController alloc] init];

    if (gameCenterController != nil)
    {
        gameCenterController.leaderboardIdentifier = @"leaderboard1";
        gameCenterController.gameCenterDelegate = self;
        gameCenterController.viewState = GKGameCenterViewControllerStateLeaderboards;

        [self presentViewController: gameCenterController animated: YES completion:nil];
    }

我想只显示"leaderboard1",但它显示所有排行榜.排行榜标识符名称是正确的.

谢谢