There wasn't any one question that was particularly hard. Overall, though, the questions asked we about details of the Objective-C language that I either didn't know, or could not remember at the time. The questions were about things that most day-to-day developers wouldn't know, since we tend to be a cut and paste crowd. Example: how do you define a class in Objective-C? I didn't remember till about 5 minutes after the interview (isn't that always the way). I really didn't like the way I was treated there. If by some miracle an offer had been made, I would probably have said no.
