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at February 2, 2010 14:48 by BenClayton
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NSNotificationCenter. Mutliple observers can be notified of events. notification sent by a specific object... [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myFooHappened:) name:MyFooNotification object:foo]; set object to nil to receive notifications of that name sent by ANY object. [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myFooHappened:) name:MyFooNotification object:nil]; Format for myFooHappened is.. -(void) myFooHappened:(NSNotification*)note { // [note name] - name of notification [note object] - sender // [note userInfo] is an NSDictionary of key-value pairs filled by the sender. } Note: notifications are posted on the SAME THREAD as they were posted. MUST unregister from all notifications in your dealloc -(void) dealloc [[NSNotificationCenter defaultCenter] removeObserver:self]; } Posting a notification.. Define a constant for the name of the notification.. in .h extern NSString* const MyFooNotification; in .m NSString* const MyFooNotification = @"MyFooNotification"; -(void) postFoo { [[NSNotificationCenter defaultCenter] postNotificationName:MyFooNotification object:self userInfo:[NSDictionary ...]];
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Using NSNotificationCenter - posting a notification
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Objective C