只在按下时让 Sprite 移动？

Question

我在屏幕上有一个圆圈，当我按下屏幕右侧时它会向右移动，当我按下屏幕左侧时它会向左移动。现在我需要做到这一点，当我开始触摸时，我的圆圈向右移动，但如果我松开触摸，那么圆圈将停止，直到我再次按下屏幕。

这是我的 touchesBegan 函数。

    for touch: AnyObject in touches {


    let location = touch.locationInNode(self)
    if location.x < self.size.width / 2 {

        let moveLeft = SKAction.moveToX(self.frame.width / 3, duration: 1.0)
        Ball.runAction(moveLeft)

    }
    else {

        let moveRight = SKAction.moveToX(self.frame.width / 1.445, duration: 1.0)
        Ball.runAction(moveRight)


        }





    }

这是我目前的情况。

Answer 1

基本上是这样的：

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    for touch: AnyObject in touches {
        let location = touch.locationInNode(self)
        if location.x < self.size.width / 2 {

            let moveLeft = SKAction.moveToX(self.frame.width / 3, duration: 1.0)
            Ball.runAction(moveLeft, withKey:"moveLeft")
        }
        else {
            let moveRight = SKAction.moveToX(self.frame.width / 1.445, duration: 1.0)
            Ball.runAction(moveRight withKey:"moveRight")
        }
    }
}

override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
    Ball.removeActionForKey("moveLeft")
    Ball.removeActionForKey("moveRight")
}

我建议您在每次需要时都对密钥进行更智能的处理，而不是将它们硬编码为字符串，但这是要点。

只在按下时让 Sprite 移动？

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