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iOS Developer Interview Questions

What are property observers?

Suggested approach: Property observers let you run code before or after a property is modified. Try to give a practical example here: “if you have a score property that holds an integer, you might attach a didSet observer so that it updates a label whenever the score changes.”

For bonus points mention the major problem they have: you might think that adding 1 to an integer is a nice and quick operation, but if you accidentally attach a complex property observer then it could cause havoc.

  Estimated difficulty: Easy

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.

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See the full list of iOS interview questions

 
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