TimeoutTestAppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
     
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidTimeout:) name:kApplicationDidTimeoutNotification object:nil];
    
    return YES;
}

- (void) applicationDidTimeout:(NSNotification *) notif {
    LoginViewController *controller = [[[LoginViewController alloc] initWithNibName:@"LoginViewController" bundle:[NSBundle mainBundle]] autorelease];
    [self.viewController presentModalViewController:controller animated:YES];
}