Implementing touch events for the restart menu

Now that our buttons are displaying, we can add touch events in the GameScene class that are similar to the START GAME button in the MenuScene class.

To add the touch events, open GameScene.swift and locate the touchesBegan function. We will add the restart menu code at the bottom of the for loop. I am including the entire touchesBegan function in the following code, with new additions in bold:

override func touchesBegan(_ touches: Set<UITouch>, with event:  
    UIEvent?) { 
    for touch in (touches) { 
        // Find the location of the touch: 
        let location = touch.location(in: self) 
        // Locate the node at this location: 
        let nodeTouched = atPoint(location) 
        // Attempt to downcast the node to the GameSprite protocol 
        if let gameSprite = nodeTouched as? GameSprite { 
            // If this node adheres to GameSprite, call onTap: 
            gameSprite.onTap() 
        } 
         
        // Check...