> since otherwise you are effectively exposing and having to maintain an extra stable API towards subclasses How so? I override what i want at my own peril. I'

> since otherwise you are effectively exposing and having to maintain an extra stable API towards subclasses How so? I override what i want at my own peril. I'm not going to complain to the author that his change broke my code. > Apple's framework code being closed source and unmodifiable by users and developers, and also buggy according to the author. Apple is constantly breaking things. If we can't extend classes, then we'll use composition and at the end of the day, what's the difference? I need code that sits in front of there so I can make it work correctly.