Question

好的，目前在我的游戏中，我可以拖动，滑动和轻弹节点。但是，我希望用户只能滑动/轻弹节点，我不希望用户能够拖动节点。我怎么能这样做？

这是我目前的代码：

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

    for touch in touches {
        let location = touch.location(in: self)

        if ball.frame.contains(location) {
            touchPoint = location
            touching = true
        }
    }
}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
    let touch = touches.first as UITouch!
    let location = touch!.location(in: self)
    touchPoint = location

    for touch in touches {
        let location = touch.location(in: self)
        touchPoint = location
        if touching {
            if touchPoint != ball.position {
                let dt:CGFloat = 1.0/60.0
                let distance = CGVector(dx: touchPoint.x-ball.position.x, dy: touchPoint.y-ball.position.y)
                let velocity = CGVector(dx: distance.dx/dt, dy: distance.dy/dt)
                ball.physicsBody!.velocity=velocity
            }
        }   
    }
}

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    touching = false

    for touch in touches {
        let location = touch.location(in: self)
        touchPoint = location
        let node = self.atPoint(location)
    }
}

Answer 1

这就是UIGestureRecognizers存在的原因。在您的视图上添加UIPanGestureRecognizer，并使用velocity(in:UIView)方法让您知道轻弹的方向和速度。

请注意，您不能在节点上放置手势，只能在视图中放置手势，因此如果您只使用手势，则需要从视图坐标转换为场景坐标。

您还可以让手势的触摸向下流入场景，允许正常的触摸调用，并使用平移手势的速度。

https://developer.apple.com/reference/uikit/uipangesturerecognizer

如何在不拖动精灵的情况下轻弹/滑动精灵？

1 个答案: