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iOS Developer Interview Questions

Can you name at least three different CALayer subclasses?

Suggested approach: This is an intermediate to advanced question aimed at folks with UIKit experience. You could choose from CAGradientLayer, CATiledLayer, CAEmitterLayer, CAShapeLayer, and more – they are all quite popular on Apple's platforms.

If I were you, I'd list off a few different subclasses, but then pick one and try to provide more detail on how it works and why it exists.

  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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