Time for action – updating labels

Let's go ahead and add the code to keep the current game stats and display them using labels:

1. Create a new group called Common.

2. Right-click on this group and click on New File; it will be Objective-C class. Name it GameStats and make it a subclass of NSObject. Save the file.

3. Open the GameStats.h file and add the following properties:

   @property (nonatomic, assign) int score;
   @property (nonatomic, assign) int birdsLeft;
   @property (nonatomic, assign) int lives;

4. Then open the GameStats.m file and add the init method:

   -(instancetype)init
   {
       if (self = [super init])
       {
           self.score = 0;
           self.birdsLeft = 0;
           self.lives = 0;
       }
       
       return self;
   }

5. Open the HUDLayer.h file and import the GameStats.h header at the top, like this:

   #import "GameStats.h"

6. Then add the following method declaration:

   -(void)updateStats:(GameStats *)stats;

7. Switch to the HUDLayer.m file and add the implementation of this method below the init method:

   -(void)updateStats...