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iOS Developer Interview Questions

Can you explain KVO, and how it's used on Apple's platforms?

Suggested approach: KVO used to be helpful in UIKit to watch for changes on values that don’t have useful delegates – you can literally say "tell me when this value changes." Try to give at least one specific example, such as watching the page load progress on a WKWebView. If you’re exclusively using SwiftUI chances are you’ll struggle here.

  Estimated difficulty: Advanced

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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