添加分数会在Xcode中迅速停止游戏

Question

我正在制作一个“不要点击白色瓷砖”游戏作为一些人的教程，游戏工作正常，直到我开始添加分数。我无法理解什么是错的，我认为这实际上是Swift的一个问题。我有一个名为ScoreFunc（）的函数，它保存了得分的所有代码（稍后我将添加更多关于高分的信息。）当按下其中一个BlackTiles时，调用此函数（如Action Outlet所示“FirstDown （）“）。我可以删除“分数+ = 1”，它可以正常工作，或者我也可以删除“ScoreLabel.text =”（分数）。“当它们都在运行时，它会计算分数，但没有任何一个瓷砖移动下来。

@IBOutlet weak var BlackTile1: UIButton!
@IBOutlet weak var BlackTile2: UIButton!
@IBOutlet weak var BlackTile3: UIButton!
@IBOutlet weak var BlackTile4: UIButton!
@IBOutlet weak var BlackTile5: UIButton!
@IBOutlet var ScoreLabel: UILabel!

var Score = Int()

override func viewDidLoad() {
    super.viewDidLoad()
    ScoreLabel.text = "0"
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}
func BlackHawkDown() {
    WhiteTile1.center.y = WhiteTile1.center.y + 142
    WhiteTile2.center.y = WhiteTile2.center.y + 142
    WhiteTile3.center.y = WhiteTile3.center.y + 142
    WhiteTile4.center.y = WhiteTile4.center.y + 142
    WhiteTile5.center.y = WhiteTile5.center.y + 142
    WhiteTile6.center.y = WhiteTile6.center.y + 142
    WhiteTile7.center.y = WhiteTile7.center.y + 142
    WhiteTile8.center.y = WhiteTile8.center.y + 142
    WhiteTile9.center.y = WhiteTile9.center.y + 142
    WhiteTile10.center.y = WhiteTile10.center.y + 142
    WhiteTile11.center.y = WhiteTile11.center.y + 142
    WhiteTile12.center.y = WhiteTile12.center.y + 142
    WhiteTile13.center.y = WhiteTile13.center.y + 142
    WhiteTile14.center.y = WhiteTile14.center.y + 142
    WhiteTile15.center.y = WhiteTile15.center.y + 142

    BlackTile1.center.y = BlackTile1.center.y + 142
    BlackTile2.center.y = BlackTile2.center.y + 142
    BlackTile3.center.y = BlackTile3.center.y + 142
    BlackTile4.center.y = BlackTile4.center.y + 142
    BlackTile5.center.y = BlackTile5.center.y + 142

    if (BlackTile1.center.y >= 600){
        BlackTile1.center.y = -71
        WhiteTile1.center.y = -71
        WhiteTile2.center.y = -71
        WhiteTile3.center.y = -71
        RandomPlacementOne()
    }
    if (BlackTile2.center.y >= 600){
        BlackTile2.center.y = -71
        WhiteTile4.center.y = -71
        WhiteTile5.center.y = -71
        WhiteTile6.center.y = -71
        RandomPlacementTwo()
    }
    if (BlackTile3.center.y >= 600){
        BlackTile3.center.y = -71
        WhiteTile7.center.y = -71
        WhiteTile8.center.y = -71
        WhiteTile9.center.y = -71
        RandomPlacementThree()
    }
    if (BlackTile4.center.y >= 600){
        BlackTile4.center.y = -71
        WhiteTile10.center.y = -71
        WhiteTile11.center.y = -71
        WhiteTile12.center.y = -71
        RandomPlacementFour()
    }
    if (BlackTile5.center.y >= 600){
        BlackTile5.center.y = -71
        WhiteTile13.center.y = -71
        WhiteTile14.center.y = -71
        WhiteTile15.center.y = -71
        RandomPlacementFive()
    }
}
func ScoreFunc() {
    Score += 1
    ScoreLabel.text = "\(Score)"
}
@IBAction func FirstDown(sender: AnyObject) {
    BlackHawkDown()
    ScoreFunc()
}
@IBAction func SecondDown(sender: AnyObject) {
    BlackHawkDown()
    ScoreFunc()
}