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    <p>You could also post a notification via NSNotificationCenter. This let's you deal with a number of situations where traversing the view controller hierarchy might be tricky - for example when modals are being presented, etc.</p> <p>E.g.,</p> <pre><code>// MyAppDelegate.h NSString * const UIApplicationDidReceiveRemoteNotification; // MyAppDelegate.m NSString * const UIApplicationDidReceiveRemoteNotification = @"UIApplicationDidReceiveRemoteNotification"; - (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo { [[NSNotificationCenter defaultCenter] postNotificationName:UIApplicationDidReceiveRemoteNotification object:self userInfo:userInfo]; } </code></pre> <p>In each of your View Controllers:</p> <pre><code>-(void)viewDidLoad { [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didReceiveRemoteNotification:) name:UIApplicationDidReceiveRemoteNotification object:nil]; } -(void)viewDidUnload { [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveRemoteNotification object:nil]; } -(void)didReceiveRemoteNotification:(NSDictionary *)userInfo { // see http://stackoverflow.com/a/2777460/305149 if (self.isViewLoaded &amp;&amp; self.view.window) { // handle the notification } } </code></pre> <p>You could also use this approach to instrument controls which need to update when a notification is received and are used by several view controllers. In that case, handle the add/remove observer calls in the init and dealloc methods, respectively. </p>
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    1. POGet the current displaying UIViewController on the screen in AppDelegate.m
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    1. USAneil Mallavarapu
    1. USAneil Mallavarapu
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    1. COWhat is `addObserver:bar` inside `viewDidLoad`? Do I have to replace with `self`?
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    2. COThanks for pointing that out - it should be self. I'll update the answer.
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    3. COcrash while getting all keys from userInfo.. Any idea? [NSConcreteNotification allKeys]: unrecognized selector sent to instance 0x1fd87480 2013-07-05 16:10:36.469 Providence[2961:907] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSConcreteNotification allKeys]: unrecognized selector sent to instance 0x1fd87480'
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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