Adding the pause functionality

To pause a game during gameplay is an important functionality. Our game will benefit from the pause functionality; it will allow the player to continue from where they left off previously.

Let's add the pause functionality:

1. Primarily, we'll create a Play/Pause button for GameScene and configure the position and image for the button. We will add the following lines of code inside the GameScene.swift class:

   var pauseBtn:SKSpriteNode = SKSpriteNode(imageNamed: "PLAY-PAUSE")

2. Set the attributes of the pauseBtn label, such as size, position, and so on, as we did earlier for the other labels in the addPlayPauseButton() method. This is how it will look:

   func addPlayPauseButton()
      {
          //self.runAction(sound)
          self.pauseBtn.name = "PAUSE"
          self.pauseBtn.zPosition = 3
          self.pauseBtn.position = CGPointMake(CGRectGetMaxX(self.frame) - pauseBtn.frame.width/2 , CGRectGetMaxY(self.frame) - pauseBtn.frame.height/2)
          self.addChild(pauseBtn)
   
      }

   Please...