NSNotificationCenter removeObserver example ios

removeObserver:

Removes all the entries specifying a given observer from the receiver’s dispatch table.

- (void)removeObserver:(id)notificationObserver

Parameters

notificationObserver

The observer to remove. Must not be nil.

Discussion

Be sure to invoke this method (or removeObserver :name:object:) before notificationObserver or any object specified in addObserver:selector:name:object: is deallocated.

Example of [NSNotificationCenter removeObserver]

The following example shows how you can register to receive locale change notifications.

NSNotificationCenter *center = [NSNotificationCenter defaultCenter];

NSOperationQueue *mainQueue = [NSOperationQueue mainQueue];

self.localeChangeObserver = [center addObserverForName:NSCurrentLocaleDidChangeNotification object:nil

queue:mainQueue usingBlock:^(NSNotification *note) {

NSLog(@"The user's locale changed to: %@", [[NSLocale currentLocale] localeIdentifier]);

}];

To unregister observations, you pass the object returned by this method to removeObserver:. You must invoke removeObserver: or removeObserver:name:object: before any object specified byaddObserverForName:object:queue:usingBlock: is deallocated.

NSNotificationCenter *center = [NSNotificationCenter defaultCenter];

[center removeObserver :self.localeChangeObserver];