NSOperation and NSNotificationCenter on the main thread

Question

I have an NSOperation. When it is finished I fire a NSNotificationCenter to let the program know that the NSoperation is finished and to update the gui.

To my under

Answer 1

You can use performSelectorOnMainThread:withObject:waitUntilDone: with using a helper method, in a similar fashion to the following example.

.....
[self performSelectorOnMainThread:@selector(fireNotification) withObject:nil waitUntilDone:YES];
...

- (void)fireNotification {
  [[NSNotificationCenter defaultCenter] postNotificationName:@"myEventName" object:self]; 
}

If you don't wait until being done, you will need to consider the cases where other threads may refer to the object which could be already cleaned up before the main thread gets invoked.