NSNotificationCenter trapping and tracing all NSNotifications

Question

For some better understanding on what happens “under the hood”, I would love to do a complete trace of any notifications happening within my application.

Naïve as I

Answer 1

For debugging purposes, I find that a breakpoint is actually better than adding code to the project. However, @Till's solution didn't seem to work for me. I found another solution online, and tweaked it a bit.

Symbolic Breakpoint

• Symbol: -[NSNotificationCenter postNotificationName:object:userInfo:]
• Condition: ((NSRange)[$arg3 rangeOfString:@"^(_|NS|UI)" options:1024]).length == 0
• Action: Debugger Command po $arg3
• Automatically continue after evaluating actions

Notes:

• The condition is preventing any notifications that begin with _, NS, or UI from being displayed.
• 1024 refers to NSRegularExpressionSearch, which doesn't seem to be available for that breakpoint.
• I use .length == 0 instead of .location == NSNotFound because NSNotFound seems to evaluate to a different value (-1 or (NSUInteger)18446744073709551615) than the returned value in this breakpoint (9223372036854775807).