NSNotificationCenter: removeAllObserver for self works for several observing objects?

Question

Say if I have several:

[[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(notificationReceived:)
                                                 name:NotificationA
                                               object:self.player];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(notificationReceived:)
                                                 name:NotificationB
                                               object:self.player];

The objects are all self.player but for different notifications, in the end I do:

[[NSNotificationCenter defaultCenter] removeObserver:self];

Is this fine or do I have to use the full method to remove observer for each notification? Currently I'm having issue when the view controller is unloaded but player is still playing in background.

Thanks

Where are you calling `removeObserver`, i mean in which method? — Deepesh Gairola, Apr 26 '13 at 05:49
@Deepesh Hi I call it in viewDidUnload and viewWillDisappear — hzxu, Apr 26 '13 at 06:32
Your code seems Ok, It should work. viewDidUnload is deprecated in IOS6 but then you are using `removeObserver` in `viewWillDisappear` as well so i dont see any problem with your code. — Deepesh Gairola, Apr 26 '13 at 06:56

score 2 · Accepted Answer · answered Apr 26 '13 at 05:57

2

The docs say: "removeObserver: Removes all the entries specifying a given observer from the receiver’s dispatch table." So your method call is enough.

answered Apr 26 '13 at 05:57

Reinhard Männer

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NSNotificationCenter: removeAllObserver for self works for several observing objects?

1 Answers1