ios - GKLeaderboard.localPlayerScore 在 iOS 8.1.3 上返回 nil？

Question

我一直在使用 GKLeaderboard.loadScoresWithCompletionHandler 然后是 localPlayerScore 属性，这样我就可以从 Game Center 检索用户的高分，当我游戏启动。

现在在 iOS 7.0 到 8.1.2 上，当我访问 localPlayerScore 属性时，我得到一个有效的 GKScore 对象。但是，在 iOS 8.1.3 上，我得到的结果为 nil，这会导致我的应用程序崩溃。我收到一个运行时错误，说它在解包可选时发现 nil。

这是与该问题相关的代码片段:

func compareLocalHighScoreFromLeaderboards()
{
    // This is to fetch data from the high score leaderboard
    let leaderboardRequest = GKLeaderboard()
    leaderboardRequest.identifier = GlobalVariables.sharedInstance._highScoreLeaderboardID
    leaderboardRequest.loadScoresWithCompletionHandler { (scores, error) -> Void in

        if error != nil
        {
            println("Error fetching score from leaderboards: \(error))")
        }
        else if scores != nil
        {
            println("entered loading scores from leaderboards")


            let leaderboardScore = leaderboardRequest.localPlayerScore // this returns a GKScore object

            var playerLocalHighScore = NSUserDefaults.standardUserDefaults().objectForKey(GlobalVariables.sharedInstance._highScoreKey) as NSNumber


            // Check first if the saved highscore is updated.
            if playerLocalHighScore.longLongValue != leaderboardScore.value
            {
                // this means that we don't have the updated leaderboard score in our device
                if playerLocalHighScore.longLongValue > leaderboardScore.value
                {

                    println("Local score is greater than leaderboard highscore. Do nothing because GameKit will automatically report to GC when there is internet connectivity")
                }
                else if playerLocalHighScore.longLongValue < leaderboardScore.value
                {

                    // update the local highscore with the leaderboard highscore
                    let updatedHighscore: NSNumber = NSNumber(longLong: leaderboardScore.value)
                    NSUserDefaults.standardUserDefaults().setObject(updatedHighscore, forKey: GlobalVariables.sharedInstance._highScoreKey)

                    // send notification message to MainMenuScene to update the SKLabelNode
                    NSNotificationCenter.defaultCenter().postNotificationName(UpdatedLocalHighScore, object: nil)
                }
            }
            else
            {
                println("The local highscore and the leaderboard highscore are already in sync")
            }


        }
    }
}

我一直在为我以前的游戏(顺便说一下，这些游戏已获批准并在 Appstore 上线)使用相同的代码来检索用户的游戏中心高分，直到 8.1.3.

我当前的应用程序被 Apple 拒绝，因为他们使用 iOS 8.1.3 设备对其进行了测试，但它崩溃了。我做了一些调试，发现这个 localPlayerScore 为 nil 是问题的根源。

有人最近遇到过这个问题吗？有谁知道如何解决这个问题？

感谢任何帮助。

Answer 1

更改 else if scores != nil为此else if leaderBoardRequest.localPlayerScore != nil ，因为 scores包含leaderboardRequest.identifier的所有信息当用户第一次打开你的游戏时，leaderBoardRequest.localPlayerScore是空的，但是 scores不一定

   let leaderboardRequest = GKLeaderboard()
leaderboardRequest.identifier = GlobalVariables.sharedInstance._highScoreLeaderboardID
leaderboardRequest.loadScoresWithCompletionHandler { (scores, error) -> Void in
    if error != nil
    {
        println("Error fetching score from leaderboards: \(error))")
    }
    else if leaderBoardRequest.localPlayerScore != nil
    {
        println("entered loading scores from leaderboards")


        let leaderboardScore = leaderboardRequest.localPlayerScore // this returns a GKScore object

        var playerLocalHighScore = NSUserDefaults.standardUserDefaults().objectForKey(GlobalVariables.sharedInstance._highScoreKey) as NSNumber


        // Check first if the saved highscore is updated.
        if playerLocalHighScore.longLongValue != leaderboardScore.value
        {
            // this means that we don't have the updated leaderboard score in our device
            if playerLocalHighScore.longLongValue > leaderboardScore.value
            {

                println("Local score is greater than leaderboard highscore. Do nothing because GameKit will automatically report to GC when there is internet connectivity")
            }
            else if playerLocalHighScore.longLongValue < leaderboardScore.value
            {

                // update the local highscore with the leaderboard highscore
                let updatedHighscore: NSNumber = NSNumber(longLong: leaderboardScore.value)
                NSUserDefaults.standardUserDefaults().setObject(updatedHighscore, forKey: GlobalVariables.sharedInstance._highScoreKey)

                // send notification message to MainMenuScene to update the SKLabelNode
                NSNotificationCenter.defaultCenter().postNotificationName(UpdatedLocalHighScore, object: nil)
            }
        }
        else
        {
            println("The local highscore and the leaderboard highscore are already in sync")
        }


    }else{
println("leaderBoardRequest.localPlayerScore is empty")}
///here report the local high score to leaderboard
}