refresh data after entering a foreground
<p>After changing the default settings, I would like to refresh data of myViewController when I enter the foreground in AppDelegate. What I do is</p>

<p>AppDelegate.m</p>

<pre><code>- (void)applicationDidFinishLaunching:(UIApplication *)application
{

    [window addSubview:[navigationController view]];
    NSLog(@"APPLICATION DID FINISH LAUNCHING");
    // listen for changes to our preferences when the Settings app does so,
    // when we are resumed from the backround, this will give us a chance to update our UI
    //
    [[NSNotificationCenter defaultCenter] addObserver:self
                                       selector:@selector(defaultsChanged:)
                                           name:NSUserDefaultsDidChangeNotification
                                         object:nil];

}

    - (void)applicationWillEnterForeground:(UIApplication *)application
    {
        /*
         Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
         */
        NSLog(@"APPLICATION WILL ENTER BACKGROUND");
        [myViewController viewDidLoad];

    }
</code></pre>

<p>myViewController.m</p>

<pre><code>- (void)viewDidLoad
{
    NSLog(@"VIEW DID LOAD IN MY VIEW CONTROLLER");
    // watch when the app has finished launching so we can update our preference settings and apply them to the UI
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updateSettings:) 
                                        name:UIApplicationDidFinishLaunchingNotification object:nil];

}

- (void)updateSettings:(NSNotification *)notif
{
    myLabel.text = @"data has just been modified";
}
</code></pre>

<p>However, there is nothing changed at all. 
If you experienced it before please help.. Any comments are welcomed here. Thanks</p>
