按下spritekit时，暂停按钮不会暂停

Question

我想在游戏中具有暂停功能，暂停按钮会加载并显示，但是按下该按钮不会暂停。

//创建暂停按钮

func createPauseButton() {
            pauseButton = SKSpriteNode(imageNamed: "pausebutton.png")
            pauseButton.size = CGSize(width:50, height:50)
            pauseButton.position = CGPoint(x: self.frame.width - 30, y: 30)
            pauseButton.zPosition = 6
            self.addChild(pauseButton)
    }

//开始接触

 if pauseButton.contains(location){
            if self.isPaused == false{
                self.isPaused = true
                pauseButton.texture = SKTexture(imageNamed: "play")
            } else {
                self.isPaused = false
                pauseButton.texture = SKTexture(imageNamed: "pausebutton.png")
            }
        }