ios - 如何调用 SKLabelNode

Question

我正在使用 SpriteKit 制作游戏。

我正在尝试添加一个 SKLabelNode (pointsLabel)，如果我不设置 label.isHidden = true，它就可以正常工作。但是，我希望在 touchesBegan 之前隐藏 Label，但似乎我无法记忆起此函数中的 LabelNode，因此标签保持隐藏状态。

我如何让它工作？

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)
    }
}

Answer 1

尝试为 SKLabelNode 命名，假设为“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)

    }

如果您只希望节点在触摸时出现，请在您的 TouchsBegan 方法中执行以下操作:

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)
        }
    }
}

如果你想让节点在任何地方都能接触到，试着把节点放在一个局部变量中

希望对你有帮助