hmm... how difficult is it to pick up Objective-C if you already know other C languages?
Its completely different from C or C++ (or C#).
It is very object oriented (
objective-c) and a lot of words are changed (class -> interface, function -> method, #include -> #import), but it is more of an acquired language. Most people hate it at first, but learn to live with it. I just made a fuckton of useless but fun-to-make applications and started liking it.
I would say its not that hard to pick up, but I am not very good with Objective-C. I just know how to do certain things.
Edited:
Oh and the documentation is superb.