Can I check for Game Center authentication status outside my app?

Question

I want to be able to know if the user running my app is connected to GameCenter (through GameCenter app or through other app), when i'm first running my app.

I found out that if I check the boolean:

[GKLocalPlayer localPlayer].authenticated)

it returns false. I guess one thing that might fix this is running at startup this:

[[GKLocalPlayer localPlayer] authenticateWithCompletionHandler:^(NSError *error)

However, in case the user is not connected this brings the game center pop up which requests an existing account or creating a new one.

So my question is: is there a way to know my user connected GC outside of my app while my app was down, without popping up the above alert in case he is not connected ?

Thanks!!

Answer 1

You can do it on iOS 6.0 or higher:

GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer];
    localPlayer.authenticateHandler = ^(UIViewController *viewController, NSError *error){
        if (viewController == nil && error == nil) {
            NSLog(@"Here, you know that the user has already signed to Game Center, whether in through your app or not.");
        } 
    };