Question

I'm trying to make a pause button and a play button for my game, but I don't know what happens that the screen just freezes when I touch pause button (play button appears and remove pause button) and then touch play button (freeze).

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

    //Pause
    pauseButton = SKSpriteNode (imageNamed: "pause")
    pauseButton.position = CGPoint(x: self.frame.width / 2, y: self.frame.height / 2)

    self.addChild(pauseButton)

    //Play
    playButton = SKSpriteNode (imageNamed: "play")
    playButton.position = CGPoint(x: self.frame.width / 2, y: self.frame.height / 2)


    //when touch buttons
    let touch = touches.first!
    if pauseButton.containsPoint(touch.locationInNode(self)) {
         addChild(playButton)
         pauseButton.removeFromParent()
    }
    if playButton.containsPoint(touch.locationInNode(self)) {
         addChild(pauseButton)
         playButton.removeFromParent()
    }
}

Answer 1

触摸屏幕时创建按钮是没有意义的。这意味着每次触摸屏幕时都会创建一个新按钮。移动上面的所有代码＆＃34; //触摸按钮＆＃34; out of touches方法并将其放入didMoveToView

您的代码结构可能看起来像这样

 class GameScene: SKScene {

        var pauseButton: SKSpriteNode! // to make your code even safer you could use optionals here
        var playButton: SKSpriteNode! // to make your code even safer you could use optionals here

      override func didMoveToView(view: SKView) {
         //Pause
         pauseButton = SKSpriteNode (imageNamed: "pause")
         pauseButton.position = CGPoint(x: self.frame.width / 2, y: self.frame.height / 2)

         self.addChild(pauseButton)

         //Play
         playButton = SKSpriteNode (imageNamed: "play")
         playButton.position = CGPoint(x: self.frame.width / 2, y: self.frame.height / 2)
     }

     override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
          for touch in touches {

               let location = touch.locationInNode(self)
               let node = nodeAtPoint(location)

               //when touch buttons
               if node == pauseButton {
                     addChild(playButton)
                     pauseButton.removeFromParent()
               }

               if node == playButton {
                  addChild(pauseButton)
                  playButton.removeFromParent()
              }
          }
      }
 }

或者您也可以将所有按钮添加到场景中，例如隐藏pauseButton。而不是删除和添加按钮，你只需隐藏和取消隐藏它们

 pauseButton.hidden = true

只有当你的目标是ios 9或更高版本且隐藏节点不再接收触摸事件时，这才能正常工作。

希望这有帮助

Pause/Play freezing game

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