I am assuming you are technical yourself but have no iOS skills. In my experience, you should interview candidate based on the basic CS principles and algorithm

I am assuming you are technical yourself but have no iOS skills. In my experience, you should interview candidate based on the basic CS principles and algorithms. Start with some classical textbook problem and based on candidates response, build around it. While the interview, focus on the thought process more than the end results. I have been doing this for a few years now and even have built tools for interviewing. Check https://codepad.remoteinterview.io https://codepad.remoteinterview.io Good luck!