How to retrieve all NSNotificationCenter observers?
cocoa, cocoa-touch, ios, nsnotificationcenter
Solution
Finally, Apple added a way to print all notification center observers:
po [NSNotificationCenter defaultCenter]
It prints a comma separated list with Name, Object, Observer, and Options:
<NSNotificationCenter:0x7f997b307500>
Name, Object, Observer, Options
WebPreferencesRemovedNotification, 0x11165b680, 0x116c87ff8, 1400
UIApplicationWillEnterForegroundNotification, 0x11165b680, 0x7f997a838000, 1400
...
Problem
I'd like to retrieve a list of observers (objects and selectors) for a given notification name. I know there's no official API for that. I also know I could subclass NSNotificationCenter to accomplish this. Sometimes however this is not a viable option because NSNotificationCenter usage is spread all over the code or even binary frameworks. So I'm looking for an unofficial/private way to do this. (Since it's about debugging only, that's fine.)