问题
In Objective-C, is there a way to list the categories on a particular class at runtime?
With the Objective-C runtime functions I can obtain details for the class and instance methods, class hierarchy, instance variables, etc. but seemingly not the category information.
Looking at F-Script, I see that it doesn't display category information (indeed, it appears not to display methods from categories at all). On the other hand, class-dump extracts category information but this is from the binary and not at runtime.
There's a mention of struct objc_category in objc/runtime.h but this looks to be private. Is there a supported way?
回答1:
from "The Objective-C Programming Language" in the SDK doc:
Category methods can do anything that methods defined in the class proper can do. At runtime, there’s no difference.
the support for objc_category struct has been removed with modern objective-c (ios, 10.5), making this information opaque.
I'm afraid you can't get the information you want.
来源：https://stackoverflow.com/questions/18942449/how-to-get-a-method-list-from-a-category