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iOS Developer Interview Questions

Can you give some examples of where singletons might be a good idea?

Suggested approach: It’s very unlikely you’ll join a company where singletons are used extensively, so feel free to say that broadly speaking singletons aren’t great. Once you’ve given up that proviso, perhaps mention that Apple uses them extensively – thinks like UIApplication, for example, are designed to exist only once. Finally, try to give a fresh example of your own, such as creating an app-wide logger.

For bonus points, perhaps compare and contrast SwiftUI’s environment.

  Estimated difficulty: Advanced

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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.

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