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iOS Developer Interview Questions

How familiar are you with Objective-C? Have you shipped any apps using it?

Suggested approach: Although Objective-C is has largely lost its grip on the enterprise it’s still going to be a useful skill for some years yet, and if the company you're interviewing with has extensive Objective-C code then hopefully you can produce a strong answer here.

Make sure and talk about how Swift and Objective-C interact using bridging headers – it's unlikely you'll join a job where you write new Objective-C, but you do at least need to know how to make Objective-C and Swift play well together.

  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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