I will cover only the technical part of the interview since behavioral and interview with the team is quite common and easy.
Technical interview consisting of multiple parts:
- Algorithm questions - few questions about CS fundamentals - big O notation, algorithm complexity, etc.
- iOS / macOS theoretical questions - Swift / Obj-C questions, some platform-specific questions, architectural choices, and preferences, etc.
- Code snippets - you're suggested to solve problems with Swift language - usually, this is part where you will get tricky questions, so you should be aware that some of the things you're asked might be incorrect, and you must point out what's exactly is incorrect or impossible and how it should be done instead.