iOS Developer Interview Questions
How would you identify and resolve a retain cycle?
Suggested approach: The first step is identification – looking for a place where leaks happen, and it’s important to mention either Instruments or the Memory Graph Debugger here. Leaks don’t always means retain cycles (for example, unused caches are effectively leaks), but they are a good starting point. Once you’ve found a possible retain cycle, you need to decide which side of the cycle should be made weak rather than strong in order to resolve it.
Estimated difficulty: Intermediate
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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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