I agree. One of the best interviews I ever had was for an iOS position at a company. The interviewer himself had a little bit of experience with iOS development

I agree. One of the best interviews I ever had was for an iOS position at a company. The interviewer himself had a little bit of experience with iOS development and he lent me his laptop and asked me to write a simple app. It was great because he was testing the very thing I was going to be hired for. Additionally, he asked how I would design X or Y and I explained the pros and cons of certain designs and I could show him right there on the screen how I'd do it. This wasn't a whiteboard where I'd have to slowly write out code in a medium I'm not used to. I literally was typing on a keyboard, using intellisense, etc. As someone who does iOS development day to day, it was a very easy way for me to show that I knew what I was doing and the guy was quite pleased when I plowed through all the requests he had.