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
See the full list of iOS interview questions
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
- What are phantom types and when would you use them?
- Can you explain MVVM, and how it might be used on Apple's platforms?
- What experience do you have of functional programming?
- Can you give some examples of where singletons might be a good idea?
- How would you explain delegates to a new Swift developer?
