iOS Developer Interview Questions
Can you explain MVVM, and how it might be used on Apple's platforms?
Suggested approach: Start with the simple definition of Model (your data), View (your layout), and View Model (a way to store the state of your application independently from your UI), but make sure you give some time over to the slightly more nebulous parts – where does networking code go, for example? This is also a good place to bring up the importance of bindings to avoid lots of boilerplate, and that probably leads to SwiftUI.
Estimated difficulty: Intermediate
Important notes
- There are over 150 interview questions in the system. Once you've read the question and come up with a suitable answer, try reading my suggested approach and see if it helps you add more detail.
- These questions are not designed to be hard; a good interviewer is more interested in generating discussion that lets your ability and interests shine through.
- If you answer a question with "yes" or "no" you've missed the point – interviewers prefer you to provide reasoning, explanation, or detail, so try to elaborate with examples!
- If you're looking for detailed technical questions about the language, you should try my Swift tests instead – there are multiple challenges that will work your brain hard.
- For a whole series of coding challenges, I wrote the perfect book for you: Swift Coding Challenges.
Related questions
- Can you give some examples of where singletons might be a good idea?
- What experience do you have of functional programming?
- Can you explain KVO, and how it's used on Apple's platforms?
- What are phantom types and when would you use them?
- How would you explain protocol-oriented programming to a new Swift developer?
