xcode - 即使我的手指在节点之外，如何让节点旋转？

Question

我会尽力以最好的方式解释这一点。我有一个圆圈，当我的手指在圆圈上移动时，我可以旋转它。我遇到的问题是，当我旋转圆圈并将手指移到圆圈之外时，旋转就会停止。我希望即使我的手指在节点之外，它仍然具有触摸功能。当我在单个 View Controller 中时它可以工作，但在 spritekit 中我无法弄清楚。

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {

    for touch in touches {
        let location = touch.locationInNode(self)
        let node = self.nodeAtPoint(location)


        if node.name == "circle" {

            let dy = circle.position.y - location.y
            let dx = circle.position.x - location.x
            let angle2 = atan2(dy, dx)
            circle.zRotation = angle2


           }
          }
         }

Answer 1

声明一个可选的 SKNode 来保存当前旋转节点，如 varrotatingNode:SKNode?。您可以覆盖 touchesBegan。

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?){
    for touch in touches {
        let location = touch.locationInNode(self)
        let node = self.nodeAtPoint(location)


        if node.name == "circle" || node.name == "rightCircle" {

            self.rotatingNode = node


           }
          }
         }

从您的评论来看，您在 TouchMoved 中似乎还有其他代码，而不是您的问题中发布的代码。但如果你想旋转 Circle 或 rightCircle，那么可以这样说:

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {

    for touch in touches {




            let dy = self.rotatingNode?.position.y - location.y
            let dx = self.rotatingNode?.position.x - location.x
            let angle2 = atan2(dy, dx)
            self.rotatingNode?.zRotation = angle2



          }
         }

然后在touchesEnded中:

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
        self.rotatingNode = nil
    }