ios - 需要帮助，使 Sprite 节点按钮在按下时具有动画效果

我确定我听起来像是一个完整的菜鸟，但是我正在开发我的第一个iOS游戏，它包含一个拍摄按钮，这是一个街机风格的按钮，我想通过在用户按住时交换为“ shootPressed”图像来对其进行动画处理它下来然后释放时交换回来。
在这里，我开始，感动和结束。请记住，我遗漏了所有无冲突的代码。最近两天，我一直在解决这个问题。

更新：我已经包含了用于创建按钮节点的函数

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    for touch: AnyObject in touches {
        let location = touch.location(in:self)
        let node = self.atPoint(location)

        if(node.name == "Shoot") {
            shootButton.texture = SKTexture(imageNamed: "shootPushed")
        }
    }
}

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    for touch: AnyObject in touches {
        let location = touch.location(in:self)
        let node = self.atPoint(location)
        if (node.name == "Shoot") {
            shootBeams()
            shootButton.texture = SKTexture(imageNamed: "shootUnpushed" )
        }
    }
}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
    for touch: AnyObject in touches {
        let location = touch.location(in:self)
        let node = self.atPoint(location)
        if node.name == ("shoot") {
            shootButton.texture = SKTexture(imageNamed: "shootPushed")
        }
    }
}

func addButtons() {
        var buttonT1 = SKTexture(imageNamed: "shootUnpushed")
        var buttonT2 = SKTexture(imageNamed: "shootPushed")

        var shootButton = SKSpriteNode(texture: buttonT1)
        shootButton.name = "Shoot"
        shootButton.position = CGPoint(x: self.frame.maxX - 130, y: leftButton.position.y)
        shootButton.zPosition = 7
        shootButton.size = CGSize(width: shootButton.size.width*0.2, height: shootButton.size.height*0.2)
        self.addChild(shootButton)
 }

最佳答案

您在shootButton中创建的addButtons是局部变量。

因此，当您在touchesMoved中执行shootButton.texture = SKTexture(imageNamed: "shootPushed")时，这肯定不是在指同一节点。

因为这显然可以编译，这意味着您已经在类中拥有属性shootButton。如果您在var shootButton = SKSpriteNode(texture: buttonT1)功能中更改addButtons，则该问题很可能已得到解决。

它应该简单地初始化shootButton属性，而不是创建一个新的局部变量：

func addButtons() {
        shootButton = SKSpriteNode(texture: buttonT1)
        shootButton.name = "Shoot"
        shootButton.position = CGPoint(x: self.frame.maxX - 130, y: leftButton.position.y)
        shootButton.zPosition = 7
        shootButton.size = CGSize(width: shootButton.size.width*0.2, height: shootButton.size.height*0.2)
        self.addChild(shootButton)
}