Or you could pick a well thought out OO language like Java or C#, maybe even Python. Unfortunately you're trapped using the abomination for iPhone development unless you pick Monotouch.
Not even Java's fans would defend it as a "well thought out OO" language.
Since this is Hacker News, it maybe appropriate to point out that nothing prevents you from building whatever specific flavour of OO you want on top of the Objective C runtime, if you want it badly enough.
I would not call Python a well-thought out OO language. Its OO is essentially a cranked up dict; the abstraction over the dict is just barely papered over. It can get pretty awkward.
