Apple Game Frameworks and Technologies

Create the Game Center Helper

Switch back to the Xcode hog project, and in the Project Navigator, just below the Assets.xcassets asset catalog, create a new group (⌥⌘N). Name this group Game Center; this is where you’ll put all of your Game Center–related code.

Inside the new group, create a new file (⌘N) using the iOS Swift File template. Name the new file GameKitHelper.swift and replace its contents with the following code:

import GameKit

class GameKitHelper: NSObject {

  // Shared GameKit Helper
  static let shared: GameKitHelper = {
    let instance = GameKitHelper()

    return instance
  }()
}

This code is the start of your new GameKit helper class; it sets up the shared instance property, which you’ll use ...