ios - 显示游戏中心排行榜无法快速工作

Question

我正在快速编码，我从我的提交按钮收到以下错误消息。排行榜没有出现在模拟器中，只是给我下面的错误信息

<GKGameCenterViewController: 0x7a8d0800> on     <Chinese_Quiz.OpeningViewController: 0x78688aa0> whose view is not in the  window hierarchy!

以下是我应用中的所有游戏中心代码。

  override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    Randomize()
    Hide()
    authenticateLocalPlayer()

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
@IBAction func Submit(sender: AnyObject) {
    saveHighscore(Score)
    showLeaderboard()

}

func authenticateLocalPlayer(){

    var localPlayer = GKLocalPlayer.localPlayer()

    localPlayer.authenticateHandler = {(viewController, error) -> Void in

        if (viewController != nil) {
            self.presentViewController(viewController, animated: true, completion: nil)
        }

        else {
            println((GKLocalPlayer.localPlayer().authenticated))
        }
    }

}

func gameCenterViewControllerDidFinish(gameCenterViewController: GKGameCenterViewController!)
{
    gameCenterViewController.dismissViewControllerAnimated(true, completion: nil)

}

func showLeaderboard() {
    var vc = self.view?.window?.rootViewController
    var gc = GKGameCenterViewController()
    gc.gameCenterDelegate = self
    vc?.presentViewController(gc, animated: true, completion: nil)
}



    func saveHighscore(score:Int) {

    //check if user is signed in
    if GKLocalPlayer.localPlayer().authenticated {

        var scoreReporter = GKScore(leaderboardIdentifier: "ChineseWeather") //leaderboard id here

        scoreReporter.value = Int64(Score) //score variable here (same as above)

        var scoreArray: [GKScore] = [scoreReporter]

        GKScore.reportScores(scoreArray, withCompletionHandler: {(error : NSError!) -> Void in
            if error != nil {
                println("error")
            }
        })

    }

}

Answer 1

通过转动这个来解决:

func showLeaderboard() {
var vc = self.view?.window?.rootViewController
var gc = GKGameCenterViewController()
gc.gameCenterDelegate = self
vc?.presentViewController(gc, animated: true, completion: nil)
}

进入这个:

func showLeaderboard() {
    var vc = self
    var gc = GKGameCenterViewController()
    var gameCenterDelegate: GKGameCenterControllerDelegate!
    // Above text was replaced from gc.gameCenterDelegate = self
    vc.presentViewController(gc, animated: true, completion: nil)
}

我不知道为什么，但它奏效了。