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Possible Duplicate:
How to do the documentation in objective C?
Is it possible to write class/method documentation in Objective-C in a way that Xcode 4 displays them in the quick help, and/or generates a doc document from it in the style of Apple's own documentation?
I don't know if it still works for Xcode 4 but for Xcode 3 you could generate API doc sets using doxygen.
Apple has a set by step guide: Using doxygen to Create Xcode Documentation Sets on how to do it.
Displaying it live - not that I know of.
But as for generating Apple like documentation, the best I have found is appledoc which I've been using for a year now. If accepts a wide range of commenting styles including Javadoc styles and can generate very Apple like documentation which it can also install directly into your Xcode help system.
There is also the appledoc tool available from GitHub. Makes nice docsets.