ios - SpriteKit 更新标签

Question

我在下面有这段代码，我只想制作一个简单的加法游戏，当你点击时打印出钱。我将其设置为打印出 currentMoney 变量，即 0 + 5 等等，但我无法让标签随之更改。

我尝试在触摸开始时设置 myLabel.text = String(currentMoney) 但它不会更新 myLabel，我该如何实现？

import SpriteKit

var currentMoney = 0

class GameScene: SKScene {
    override func didMoveToView(view: SKView) {
        /* Setup your scene here */
        let myLabel = SKLabelNode(fontNamed:"Chalkduster")
        myLabel.text = String(currentMoney)
        myLabel.fontSize = 45
        myLabel.position = CGPoint(x:CGRectGetMidX(self.frame), y:CGRectGetMidY(self.frame))

        self.addChild(myLabel)
    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        currentMoney = currentMoney + 5
        print(currentMoney)
    }

    override func update(currentTime: CFTimeInterval) {
        /* Called before each frame is rendered */
    }
}

Answer 1

您无法更改文本，因为您无法在 moveToView 函数之外访问您的标签。试试这个:

    import SpriteKit

    var currentMoney = 0
    var myLabel: SKLabelNode! //made it globally

    class GameScene: SKScene {
        override func didMoveToView(view: SKView) {
            /* Setup your scene here */
            myLabel = SKLabelNode(fontNamed:"Chalkduster")
            myLabel.text = String(currentMoney)
            myLabel.fontSize = 45
            myLabel.position = CGPoint(x:CGRectGetMidX(self.frame), y:CGRectGetMidY(self.frame))

        self.addChild(myLabel)
    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {

        currentMoney = currentMoney + 5
        myLabel.text = String(currentMoney)

        print(currentMoney)
    }