GameKitService is created and maintaned with ❥ by Sascha Muellner.

Swift codecov Platform License Version Swift Version SPM compatible README

This is a Swift package with support for iOS/macOS/tvOS that focuses on bridging the current GameKit implementation to a single service structure utilizing Combine to simplify and modernize GameKit's match handling.

The latest version of GameKitService requires:

• Swift 5+
• iOS 13+
• Xcode 11+

Using SPM add the following to your dependencies

'GameKitService', 'master', 'https://github.com/SwiftPackageRepository/GameKitService.swift.git'

Given you already authenticated the user and did initiate a match you, using for example GCHelper or GameKitUI, you can now start it using start method from the GameKitService:

import GameKit
import GameKitService
let match: GKMatch
GameKitService
 .shared
 .start(match)

The following match data changes can be subscribed using the GameKitService.

Subscribe to the authenticated: CurrentValueSubject<Bool, Never> CurrentValueSubject, to receive when the user is authenticated at the GameCenter.

import GameKit
import GameKitService
let match: GKMatch
GameKitService
 .shared
 .authenticated(match)

Subscribe to the started: PassthroughSubject<GKMatch, Never> PassthroughSubject, to receive data about the starting of the match.

var cancellable: AnyCancellable?
self.cancellable = GameKitService
 .ended
 .received.sink { (match: GKMatch) in
 // match: the ending match
 }

Subscribe to the received: PassthroughSubject<(match: GKMatch, data: Data, player: GKPlayer), Never> PassthroughSubject, to receive data about the match from another player's device in the match.

var cancellable: AnyCancellable?
self.cancellable = GameKitService
 .shared
 .received.sink { (match: GKMatch, data: Data, player: GKPlayer) in
 // match: the current match
 // data: the data send from
 // player: the player that did send the data 
 }

Subscribe to the ended: PassthroughSubject<GKMatch, Never> PassthroughSubject, to receive data about the ending of the match.

var cancellable: AnyCancellable?
self.cancellable = GameKitService
 .ended
 .received.sink { (match: GKMatch) in
 // match: the ending match
 }

To send data to other players in the match there are two possibilites. In the first one the data is send to all players in the match:

let data = "Hello Players!".data(using: .utf8)!
do {
 try GameKitService
 .shared
 .send(data)
} catch {
}

Where as the second possibility allows you to send to a dedicated group (one or more) of players in the match.

let playerOne: GKPlayer
let data = "Hello Player One!".data(using: .utf8)!
do {
 try GameKitService
 .shared
 .send(data, players: [playerOne])
} catch {
}

• Apple Documentation GameKit
• raywenderlich.com: Game Center for iOS: Building a Turn-Based Game
• raywenderlich.com: Game Center Tutorial: How To Make A Simple Multiplayer Game with Sprite Kit: Part 1/2
• Medium: GameKit Real Time Multiplayer Tutorial