每当分数增加时，Spritekit游戏都会跳过

Question

我的SpriteKit游戏正在跳过。我已将问题缩小到这些代码段。在我的override func update(_ currentTime: TimeInterval)函数中，我进行了以下检查，看我的玩家是否已经越过障碍：

if obstacleScoreList[0].position.y < player.position.y {
    obstacleScoreList.removeFirst()
    score += 1

更改分数后，我将获得以下didSet：

var score = 0 {
    didSet {
        let stringFromNum = String(score)
        var numList = [String]()

        for char in stringFromNum {
            numList.append(String(char))
        }

        switch numList.count {

        case 1:
            //scoreLabel3.texture = SKTexture(imageNamed: "num" + numList[0])
            //blurr3.texture = SKTexture(imageNamed: "BlueNum" + numList[0])
            scoreLabel3.texture = SKTexture(imageNamed: "num" + numList[0])
            blurr3.texture = SKTexture(imageNamed: "BlueNum" + numList[0])
        case 2:
            scoreLabel3.texture = SKTexture(imageNamed: "num" + numList[1])
            blurr3.texture = SKTexture(imageNamed: "BlueNum" + numList[1])

            scoreLabel2.texture = SKTexture(imageNamed: "num" + numList[0])
            blurr2.texture = SKTexture(imageNamed: "BlueNum" + numList[0])
        case 3:
            scoreLabel3.texture = SKTexture(imageNamed: "num" + numList[2])
            blurr3.texture = SKTexture(imageNamed: "BlueNum" + numList[2])

            scoreLabel2.texture = SKTexture(imageNamed: "num" + numList[1])
            blurr2.texture = SKTexture(imageNamed: "BlueNum" + numList[1])

            scoreLabel1.texture = SKTexture(imageNamed: "num" + numList[0])
            blurr1.texture = SKTexture(imageNamed: "BlueNum" + numList[0])
        default:
            break
        }
    }
}

我的得分是3个SKSpriteNodes，后面还有3个SKSpriteNodes。一旦更新了分数，我就在更新这些spritenodes。如果我将score += 1注释掉，则它运行平稳。有什么想法吗？