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iOS Developer Interview Questions

Apart from the built-in ones, can you give an example of property wrappers?

Suggested approach: If it weren’t for the built-in restriction, this would be easy to answer with @State, @EnvironmentObject, and more, but with that restriction in place you need to be more creative – what real example can you think of? For example, a wrapper to make sure numbers are never negative, or strings are never empty, or perhaps arrays that silently stay sorted.

  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.

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