ios - 如何召回SKLabelNode

我正在用SpriteKit做一个游戏。
我正在尝试添加一个SKLabelNode（pointsLabel），如果我不设置label.isHidden = true，它就会工作。但是，我希望标签一直隐藏到touchesBegan，但似乎我无法调用此函数中的LabelNode，因此标签保持隐藏状态。
我怎样才能让它工作？
这是代码：

class GameScene: SKScene {

private var pointsLabel: SKLabelNode?

override func didMove(to view: SKView) {
    pointsLabelShow()
}

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    // Get label node from scene and store it for use later
    self.label = self.childNode(withName: "//pointsLabel") as? SKLabelNode
    if let label = self.label {
        label.isHidden = false
        let fade = SKAction.fadeIn(withDuration: 0.2)
        let sequence = SKAction.sequence([fade])
        label.run(sequence)

    }
}

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

    self.label = self.childNode(withName: "//pointsLabel") as? SKLabelNode
    if let label = self.label {
        label.position.y = ballHeight + 840
    }

    func pointsLabelShow() {
        let pointsLabel = SKLabelNode(fontNamed: "orkneymedium")
        pointsLabel.isHidden = true
        pointsLabel.text = "000"
        pointsLabel.fontSize = 50
        pointsLabel.fontColor = SKColor.white
        self.addChild(pointsLabel)
    }
}

}

最佳答案

尝试为SKLabelNode命名，假设“pointsLabel”

func pointsLabelShow() {
        let pointsLabel = SKLabelNode(fontNamed: "orkneymedium")
        pointsLabel.isHidden = true
        pointsLabel.text = "000"
        pointsLabel.fontSize = 50
        pointsLabel.name = "pointsLabel"
        pointsLabel.fontColor = SKColor.white
        self.addChild(pointsLabel)

    }

如果只希望在触碰节点时使用TouchStarted方法，请执行以下操作：

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    let touch = touches.first!
    let positionInScene = touch.location(in: self)
    let touchedNode = self.atPoint(positionInScene)

    if let name = touchedNode.name
    {
        if name == "pointsLabel"
        {
            touchedNode.isHidden = false
            let fade = SKAction.fadeIn(withDuration: 0.2)
            let sequence = SKAction.sequence([fade])
            touchedNode.run(sequence)
        }
    }
}

如果希望该节点与任何地方接触，请尝试将该节点放在局部变量中
希望这有帮助

关于ios - 如何召回SKLabelNode，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/57080335/