I was rejected in a job interview quite some time ago, probably because I defended encoding UI in code, instead of using Storyboard. Sometimes destiny saves you from trouble.
Most big companies (Google, Facebook, Adobe, etc.) have internal UI frameworks that you share amongst 100s of developers and dozens of projects. Your interviewer should not ding you using code to build your UI. If anything, that's a plus as it should help you have a deeper understanding of how UIKit pieces things together.