I got through 2 stages. An initial interview with another iOS dev which was challenging but manageable, and a tech test. I got rejected at the tech test stage for what I think are mostly reasonably subjective reasons (with a couple of valid pieces of feedback) which is a shame. I put a huge amount of effort in and made what I think was a very carefully considered solution (albeit a perhaps slightly over-engineered one) which ticked all of the boxes in their spec and more, as well as adopting their preferred architecture, binding mechanisms and layout library. To not even get to talk through the criticisms is a real shame.