Question

during the design of a component it turned out that I would need a “one-shot” handler of some notification. I’d have an object that would respond to a notification only once and then it should delete itself. My object is initialized with autorelease and I can’t change this. Would the following pattern right to achieve this?

- (void) init 
{
    [[NSNotificationCenter defaultCenter] addObserver:[self retain]
                                             selector:@selector(doRespond)
                                                 name:@"someNotification"
                                               object:nil];
}

- (void) doRespond 
{
    [[NSNotificationCenter defaultCenter] removeObserver:self 
                                                    name:@"someNotification" 
                                                  object:nil];
    // do something
    [self release];
}

Answer 1

That would from first sight be the correct way to do it.