Phone screening with the recruiter, then a technical screening with an iOS engineer at the company. The technical screening was 30 minutes of Q&A about core iOS concepts, then a 30 minute period of time to solve an algorithm question. Throughout the Q&A, it felt like the interview wasn't interested in being in the interview. When asked a question, I would give a detailed response, and then after looking at their notes would ask me the next question, to which I had already answered with a previous response. This happened for several questions, which made me wonder if it was just an "ask all the questions to tick the boxes" sort of situation. During the coding portion, the interviewer would interrupt me with things like "there's an error at the end of the function" because I hadn't written a return statement yet, but was trying to compose some pseudocode for the algorithm and wasn't worried about my return statement. Interruptions like this occurred frequently, and ultimately I ran out of time to complete the problem completely (Took my code to a playground afterwards and realized I was just a couple lines away from finishing, but the stress of an interview situation kept me from seeing it).

I only made it to the 1st technical interview. Be prepared to do live coding on a platform called CodeSignal. It has code completion support to some extent. Be very good at fundamental data structures like arrays, dictionaries, stacks, queues and writing recursive functions etc before facing this interview.