Authenticate game Center

Question

Created Dec ’20

Replies 8

Boosts 0

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Participants 2

How would I authenticate Game Center and local player in my app? I am trying to add achievements, but the whole “authentication” part is very confusing to me.

Answered by igorland in 651638022

You can authenticate by using a method along the following lines (in the GameCenterHelp that will be a singleton):

Code Block func authenticatePlayer() {
        GKLocalPlayer.local.authenticateHandler = { gcAuthVC, error in
           
        // In your delegate, implement method `didChangeAuthStatus`, for example to enable a Game Center button
        self.delegate?.didChangeAuthStatus(isAuthenticated: GKLocalPlayer.local.isAuthenticated)
        // This is called if the local player gets authenticated. Nothing happens, GKLocalPlayer gets registered
        if GKLocalPlayer.local.isAuthenticated {
                GKLocalPlayer.local.register(self)
        }
         // This is called, when a player opens your app and he|she is not authenticated. 
         // It opens a viewController with sign-in info
        else if let vc = gcAuthVC {
                self.delegate?.presentGameCenterAuth(viewController: vc)
        }
        // Handing an error while authenticating
        else {
                print(">>>>> Error authenticating the Player! \(error?.localizedDescription ?? "none") <<<<<")
        }
}

So, in your GameScene class you may have something like:

Code Block override func didMove(to view: SKView) {
     GameCenterHelper.sharedInstance.delegate = self
     GameCenterManager.sharedInstance.authenticatePlayer()
 }
@objc func didChangeAuthStatus(isAuthenticated: Bool) {
       ... For example, stop spinning activity indicator
       if indicator != nil {
            indicator!.stop()
            indicator!.removeFromSuperview()
            indicator = nil
        }
        ... Or enable the *PLAY ON GAMECENTER* button
        if GKLocalPlayer.local.isAuthenticated {
            btnPlayGameCenter.setButtonLabel(title: btnPlayGameCenterTitle(), font: "Noteworthy-Bold", fontSize: 40)
}
    
    /** Present the view controller with the Sign-in info */
    func presentGameCenterAuth(viewController: UIViewController?) {
        guard let vc = viewController else {return}
        self.view!.window?.rootViewController?.present(vc, animated: true)
 }

Boost

Answer 1

igorland OP

Dec ’20

Accepted Answer

You can authenticate by using a method along the following lines (in the GameCenterHelp that will be a singleton):

Code Block func authenticatePlayer() {
        GKLocalPlayer.local.authenticateHandler = { gcAuthVC, error in
           
        // In your delegate, implement method `didChangeAuthStatus`, for example to enable a Game Center button
        self.delegate?.didChangeAuthStatus(isAuthenticated: GKLocalPlayer.local.isAuthenticated)
        // This is called if the local player gets authenticated. Nothing happens, GKLocalPlayer gets registered
        if GKLocalPlayer.local.isAuthenticated {
                GKLocalPlayer.local.register(self)
        }
         // This is called, when a player opens your app and he|she is not authenticated. 
         // It opens a viewController with sign-in info
        else if let vc = gcAuthVC {
                self.delegate?.presentGameCenterAuth(viewController: vc)
        }
        // Handing an error while authenticating
        else {
                print(">>>>> Error authenticating the Player! \(error?.localizedDescription ?? "none") <<<<<")
        }
}

So, in your GameScene class you may have something like:

Code Block override func didMove(to view: SKView) {
     GameCenterHelper.sharedInstance.delegate = self
     GameCenterManager.sharedInstance.authenticatePlayer()
 }
@objc func didChangeAuthStatus(isAuthenticated: Bool) {
       ... For example, stop spinning activity indicator
       if indicator != nil {
            indicator!.stop()
            indicator!.removeFromSuperview()
            indicator = nil
        }
        ... Or enable the *PLAY ON GAMECENTER* button
        if GKLocalPlayer.local.isAuthenticated {
            btnPlayGameCenter.setButtonLabel(title: btnPlayGameCenterTitle(), font: "Noteworthy-Bold", fontSize: 40)
}
    
    /** Present the view controller with the Sign-in info */
    func presentGameCenterAuth(viewController: UIViewController?) {
        guard let vc = viewController else {return}
        self.view!.window?.rootViewController?.present(vc, animated: true)
 }

1

Answer 2

QuantumGames OP

Dec ’20

Thanks. Would that work with a swiftUI single view app, or just with a SpriteKit app?

0

Answer 3

igorland OP

Dec ’20

That should work with any kind of app. It is only a matter where you call authenticatePlayer() and assign the delegate: in didMove(view:) or viewDidLoad() or whatever SwiftUI initial method is (I am old school).

0

Answer 4

QuantumGames OP

Dec ’20

Ok thanks

0

Answer 5

igorland OP

Dec ’20

No worries. Please feel free to upvote my response if it works. Cheers.

0

Answer 6

QuantumGames OP

Dec ’20

Sorry, but I have one more question. Where would I put the code? In contentview.swift, appdelegate.swift, or scenedelegate.swift?

0

Answer 7

igorland OP

Dec ’20

Which code? Method authenicatePlayer()? For this, you need to have a separate class that will handle all you GameKit methods. Google "raywenderlich gamecenter tutorials" (a tutorial on building a turn-based game has code in Swift).
Or where to call GameCenterHelper.sharedInstance.authenticatePlayer?

0

Answer 8

QuantumGames OP

Dec ’20

Never mind I figured it out thanks for all your help!

0