如何让我的计分器在SpriteKit游戏中工作

class GameScene: SKScene {
    var scoreLabel: SKLabelNode!
    var score: Int = 0 {
        didSet {
            scoreLabel.text = "Score: \(score)"
        }
    }
    
    override func didMove(to view: SKView) {
        scoreLabel = SKLabelNode(text: "Score: 0")
        scoreLabel.position = CGPoint(x: size.width/2, y: size.height - 50)
        addChild(scoreLabel)
    }
    
    // ...
}

class GameScene: SKScene {
    // ...
    
    func playerScored() {
        score += 1
    }
    
    // ...
}