Determine Node Touched in Gesture Recognizer

问题

I have a SpriteKit scene that can have thousands of distinct nodes in it. I am also implementing a single-tap gesture recognizer on the scene, in the hopes that I can determine which node has been touched in the scene once the gesture recognizer is triggered. Currently, my (non-working) code looks like this:

@objc func singleTap(_ sender: UIPinchGestureRecognizer) {
    print("single tap gesture recognized")

    if sender.numberOfTouches == 1 {

        let touchPoint = sender.location(in: self.view)
        let touchedNode = self.atPoint(touchPoint)

        if let name = touchedNode.name
        {
            if name == "newMapButton"
            {
                print("newMapButton Touched")
            } else {
                print("what did you touch?")
            }
        }

    }
}

The gesture recognizer is working. When I touch the new map button I get the "single tap gesture recognized" in the console, but nothing more. What am I doing wrong here?

回答1:

1. In GameScene file, I created my button in didMove method like so

   let btnTest = SKSpriteNode(imageNamed: "button")
   btnTest.setScale(0.2)
   btnTest.name = "Button"
   btnTest.zPosition = 10
   btnTest.position = CGPoint(x: 100, y: 200)
   self.addChild(btnTest)
   

2. Adding Gesture in didMove:

   let tapRec = UITapGestureRecognizer()
   tapRec.addTarget(self, action:#selector(GameScene.tappedView(_:) ))
   tapRec.numberOfTouchesRequired = 1
   tapRec.numberOfTapsRequired = 1
   self.view!.addGestureRecognizer(tapRec)
   

3. Finally implementing tappedView method

   @objc func tappedView(_ sender:UITapGestureRecognizer) {
   
   if sender.state == .ended {
   
       var post = sender.location(in: sender.view)
       post = self.convertPoint(fromView: post)
       let touchNode = self.atPoint(post)
   
       if let name = touchNode.name
       {
           if name == "Button"
           {
               print("newMapButton Touched")
           } else {
               print("what did you touch?")
           }
       }
   }
   }
   

来源：https://stackoverflow.com/questions/50358366/determine-node-touched-in-gesture-recognizer