Ios 如何使用触摸仅在y坐标中移动对象？

我是Xcode新手，希望检查如何对其进行编码，以便我可以使用touch仅在y坐标中移动对象

目前，我已将其编程为跟随我的触摸，但它将同时跟随x和y坐标

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    /* Called when a touch begins */
    if moving.speed > 0  {
        for touch: AnyObject in touches {
            let location = touch.locationInNode(self)


            bird.physicsBody?.velocity = CGVectorMake(0, 0)
            bird.position = location

        }
    }else if canRestart {
        self.resetScene()
    }
}

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我试过在网上搜索一些链接，但我似乎不太了解。如果您只是想从当前x位置沿y轴上下移动“bird”，请仅使用该位置的y值：

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    /* Called when a touch begins */
    if moving.speed > 0  {
        for touch: AnyObject in touches {
            let location = touch.locationInNode(self)

            // Just duplicate our old position
            var newPosition = bird.position
            // and change only the y value, leaving the x value as whatever it was initially set to. X will never change
            newPosition.y = location.y

            bird.physicsBody?.velocity = CGVectorMake(0, 0)
            bird.position = newPosition

        }
    }else if canRestart {
        self.resetScene()
    }
}

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请查看和的文档。

@LeeBoXian没问题，如果它解决了问题，您能将此标记为您的答案吗？