Request addobserver / removeobserver

Question

Is it possible to use first -removeObserver:and then call -addObserver:with the same name? Or is it a rule to have -addObserver:before -removeObserver:?

I tried this with OS 4.0, and it seems like it is normal (without crashes, warnings, etc.).

-(void) setObserver
{
[[NSNotificationCenter defaultCenter] removeObserver:self 
                                                name:OBSERVER_NAME object:nil]; 

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector: @selector(selectorName)
                                             name:OBSERVER_NAME 
                                           object:nil]; 
}

The reason is that two observers with the same method should be selectorNamecalled twice, assuming that the method -setObserverwas called again if it was issued inside -viewDidLoadand a warning about memory.

Also do I need to call -removeObserver:on time -dealloc?

Answer 1

-selectorName, , , . Cocoa , , .

, , -viewDidUnload. , -dealloc, , , , , .