This post was published more than a few years ago (on 2005-09-30) and may contain inaccurate technical information, outmoded thoughts, or cringe takes. Proceed at your own risk.
Cocoa 101: Object-Oriented Programming for the Masses, Part 1 and Part 2. Nice scratching the surface of the way Cocoa's classes think, and clearer that some of the books I have in its explanations of same.
Never mind--- I'm still confused.
See, this is why I figure it'll take at least three books, all by different authors, to teach me programming--- because none of them make sense on their own.