game center unavailable player is not signed in - iphone

Question

On iOS 6 when a player is not signed in and is trying to use GameCenter an UIAlertView with the text that i put in title pops up. "game center unavailable player is not signed in". My question is is it possible to replace that UIAlertView with anything else, with my own interface element?
[GKLocalPlayer localPlayer].authenticateHandler = ^(UIViewController *viewController, NSError *error)
{
if ([[GKLocalPlayer localPlayer] isAuthenticated])
{
NSLog(#"[gamecenter] player authenticated: %#\n", [GKLocalPlayer localPlayer]);
[self gamecenterLoadAchievements];
[GKMatchmaker sharedMatchmaker].inviteHandler = ^(GKInvite *acceptedInvite, NSArray *playersToInvite)
{
// Insert application-specific code here to clean up any games in progress.
if (acceptedInvite)
{
NSLog(#"Accepted invitation");
isInvited = YES;
[[GameLevel sharedGameLevel] setCurrentGameMode:GameModeGameCenter];
GKMatchmakerViewController *mmvc = [[[GKMatchmakerViewController alloc] initWithInvite:acceptedInvite] autorelease];
mmvc.matchmakerDelegate = self;
AppDelegate * delegate = (AppDelegate *) [UIApplication sharedApplication].delegate;
[delegate.viewController presentModalViewController:mmvc animated:YES];
}
else if (playersToInvite)
{
NSLog(#"Players to invite");
GKMatchRequest *request = [[[GKMatchRequest alloc] init] autorelease];
request.minPlayers = 2;
request.maxPlayers = 2;
request.playersToInvite = playersToInvite;
GKMatchmakerViewController *mmvc = [[[GKMatchmakerViewController alloc] initWithMatchRequest:request] autorelease];
mmvc.matchmakerDelegate = self;
[presentingViewController presentModalViewController:mmvc animated:YES];
}
};
}
else
if (viewController)
{
AppDelegate *delegate = (AppDelegate *) [UIApplication sharedApplication].delegate;
NavigationController *_viewController = delegate.viewController.navController;
[_viewController presentViewController: viewController animated: YES completion:nil];
}
else
{
NSLog(#"[gamecenter] %#\n", error);
gcLoginFailed = YES;
if ([[error domain] isEqualToString:GKErrorDomain])
{
if ([error code] == GKErrorNotSupported)
gcIsSupported = NO;
else
if ([error code] == GKErrorCancelled)
gcLoginCancelled = YES;
}
}
};

Answer 1

Just not use UIAlertView Use your own graphics with a UIButton
If you are using the disableGameCenter method in authenticating , just don't use it , instead of it use a integer ilk int isPlayerSignedIn . And just return it to 1 or 0 . So ;
if (isPlayerSignedIn==0) {
//display your graphics
}
else do nothing .
edit :
else
if (viewController)
{
AppDelegate *delegate = (AppDelegate *) [UIApplication sharedApplication].delegate;
NavigationController *_viewController = delegate.viewController.navController;
[_viewController presentViewController: viewController animated: YES completion:nil];
}
just if you don't use these lines of code you will see that you don't get that UIAlertView
Then you can implement a "game center is unavailable" staff , but additionally you have to implement a login screen too.