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iOS Developer Interview Questions

What is an efficient way to cache data in memory?

Suggested approach: There are lots of ways of making caches, with the most humble being a simple dictionary, but whatever you choose you should be prepared to explain your choice and why you like it. Make sure and take into account how you remove data from the cache, either explicitly or to hit a memory quota.

If you're comfortable talking about it, NSCache is definitely preferable over a simple dictionary because it automatically gets cleared by the system when memory is low.

  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

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