NSNotificationCenter Thread Safety
As far as I can tell,
NSNotificationCenternow keeps a strong reference to the observer while posting a notification. As a consequence, the observer can no longer deallocate while processing the notification. This behavior occurs both with Automatic Reference Counting (ARC) and with Manual Retain-Release (MRR). Hooray!It’s still true that
removeObserver:does not block for notifications in progress.
