I had an on-site coding interview at a place where they asked me to implement a small iOS project on my own computer doing things however I normally would. Had access to documentation, SO, could search google for whatever. They gave me a couple hours to do as much as I could - there was another dev around that could answer questions I had. Afterwards, I walked them through what I had done, answered their questions, responded to feedback, etc. This was code interviewing done right in my mind.

Whiteboards are for design, computers are for code.

Good point, I had totally forgotten we had that at a past company. Give the candidate a computer, a simple task, someone to ask and check results after 2h.