Debugging NSNotificationCenter and NSRunLoop

Tim Ekl:

The debugDescription property has been around for quite awhile. Formally first appearing as a @property on NSObject in iOS 5 and macOS 10.8, it came across into Swift as a member of the CustomDebugStringConvertible protocol, and continues to be incredibly useful today.

[…]

I don’t remember why I decided to try printing plain old NSNotificationCenter.defaultCenter in lldb, but I do remember being very surprised at the output. Rather than a plain object class-name-and-pointer pair like most things return, I found a long list of registered notification observers, complete with column headers[…]

Rob Mayoff:

NSRunLoop/CFRunLoop also provides a very detailed debugDescription.

Cocoa Debugging iOS iOS 11 Mac macOS 10.13 High Sierra Programming

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