Issue with Game Center on Monotouch - xamarin.ios

Question

I'm trying to implement Game Center into my game but i have problems with it.
Here is my Main.cs code :
namespace iosgame
{
public class Application
{
[Register ("AppDelegate")]
public partial class AppDelegate : IOSApplication {
MainViewController mainViewController;
public AppDelegate(): base(new Game(new StaticsDatabase(),new StoreDatabase(),new InappPurchase(),new Social(),new MissionsDatabase()), getConfig()) {
}
internal static IOSApplicationConfiguration getConfig() {
IOSApplicationConfiguration config = new IOSApplicationConfiguration();
config.orientationLandscape = true;
config.orientationPortrait = false;
config.useAccelerometer = false;
config.useMonotouchOpenTK = true;
config.useObjectAL = true;
return config;
}
//
// This method is invoked when the application has loaded and is ready to run. In this
// method you should instantiate the window, load the UI into it and then make the window
// visible.
//
// You have 17 seconds to return from this method, or iOS will terminate your application.
//
public override bool FinishedLaunching (UIApplication app, NSDictionary options)
{
base.FinishedLaunching(app,options);
UIViewController controller = ((IOSApplication)Gdx.app).getUIViewController();
mainViewController = new MainViewController();
controller.View.Add(mainViewController.View);
return true;
}
private bool isGameCenterAPIAvailable()
{
return UIDevice.CurrentDevice.CheckSystemVersion (4, 1);
}
}
static void Main (string[] args)
{
UIApplication.Main (args, null, "AppDelegate");
}
}
}
And here is the superclass of that Main.cs : https://github.com/libgdx/libgdx/blob/master/backends/gdx-backend-iosmonotouch/src/com/badlogic/gdx/backends/ios/IOSApplication.java
I'm trying to use this https://github.com/xamarin/monotouch-samples/blob/master/GameCenterSample/GameCenterSample/MainViewController.cs example but i can't see any authenticate window in my game.I can see "Welcome back ,name" notification but after i log out from gamecenter app and reopen my game but i can't see any authentication window.
How can i fix it?
Thanks in advance

Answer 1

Just call this in FinishedLaunching:
if (!GKLocalPlayer.LocalPlayer.Authenticated) {
GKLocalPlayer.LocalPlayer.Authenticate (error => {
if (error != null)
Console.WriteLine("Error: " + error.LocalizedDescription);
});
}
This should display a Game Center "toast" saying "Welcome back, Player 1".
Here are some ideas if this doesn't work:
Make sure you have setup a new bundle id in the developer portal, and declare it in your Info.plist
Start filling out your app details in iTunes connect (Minimum is description, keywords, icon, 1 screenshot), and make sure to enable Game Center and add your new game to a group
Login with a test iTunes user in Game Center (create in ITC), or the login associated with your developer account
PS - I wouldn't worry about checking for iOS 4.1, just target iOS 5.0 and higher these days.