Question

Is it possible to check which UIViewController scene that is active in code?

I have a push notification coming in to the app, and want to do different things depending on what view the user is in, something like this:

AppDelegate:

- (void)application:(UIApplication*)application didReceiveRemoteNotification:(NSDictionary*)userInfo
{
    if (tableViewController == active) 
       //get data from server
    else if (detailedViewController == active) 
        //Get Image from server
}

Thanks

Answer 1

Post a local notification:

  [NSNotificationCenter defaultCenter] postNotificationName:@"foo" object:whatever];

and have all of the appropriate viewControllers watch for it:

    [[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(handleFoo:) 
                                             name:@"foo" 
                                           object:nil];

The viewControllers would add or remove Observers as necesary.