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iOS Developer Interview Questions

When might you use NSSortDescriptor?

Suggested approach: Start out with a simple definition of what NSSortDescriptor actually does: it lets us provide sorting instructions to a data store, e.g. "sort by name alphabetically".

Once you've done that you should go on to mention that it's most commonly when used in Core Data to sort the data that got fetched, but it's also available in CloudKit.

For bonus points, talk about how it can be a stringly typed API, or you can use key paths instead.

  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

See the full list of iOS interview questions

 
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