title: Removing an observer in iOS
body: <p>i'm adding an observer in an NSObject class. And the app will be running 24X7. Since i'm not not removing the observer, app is getting crashed many times. So is there a way to fix this. Is it necessary to remove the observer in -(void)delloc method. Because if i remove the observer i can no longer get the notification. Any suggestion will be greatly appreciated. Thank you  </p>