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copied!<p>"I also need the notification callbacks to still be fired if the view is off-screen" -> you may need to register UIApplicationWillEnterForegroundNotification. If so, let try this: </p> <pre><code>- (void)viewWillAppear:(BOOL)animated { NSLog(@"viewWillAppear"); [super viewWillAppear:animated]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidEnterBackground:) name:UIApplicationDidEnterBackgroundNotification object:nil]; } - (void)viewWillDisappear:(BOOL)animated { NSLog(@"viewWillDisappear"); [super viewWillDisappear:animated]; [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidEnterBackgroundNotification object:nil]; } - (void)applicationWillEnterForeground:(UIApplication *)application { NSLog(@"applicationWillEnterForeground"); [[NSNotificationCenter defaultCenter] removeObserver:self]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidEnterBackground:) name:UIApplicationDidEnterBackgroundNotification object:nil]; // do your stuff here } - (void)applicationDidEnterBackground:(UIApplication *)application { NSLog(@"applicationDidEnterBackground"); [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationWillEnterForeground:) name:UIApplicationWillEnterForegroundNotification object:nil]; } </code></pre> <p>The idea is adding or removing UIApplicationDidEnterBackgroundNotification whenever coming in and out of your screen. We just register UIApplicationWillEnterForegroundNotification when the app enter background and remove once it's back. Be noticed that we just remove UIApplicationDidEnterBackgroundNotification when viewWillDisappear.</p> <p>My dealloc() is not called by somehow, so I found this way, hope it useful for you too. </p> <p>Enjoy :) </p>

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