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iOS Developer Interview Questions

When would you use @StateObject versus @ObservedObject?

Suggested approach: I would recommend you start by making the similarities and differences clear, then sum up by answering the question directly. So, you would say that both of these property wrappers monitor an observable object for changes, and refresh SwiftUI views when changes happen. However, @StateObject is used when you create an object for the first time and want to retain ownership of it, whereas @ObservedObject is used in other places where you pass the object and does not retain ownership.

  Estimated difficulty: Easy

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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

See the full list of iOS interview questions

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