iOS Developer Interview Questions & Answers

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iOS developer is a software developer who designs and develops applications for mobile devices powered by Apple's iOS operating system.

Whether you're a job seeker preparing to be interviewed for the role of iOS Developer or an employer preparing to interview candidates for iOS Developer position, these iOS Developer interview questions will help you prepare yourself for the job interview session.

iOS Developer Interview Questions

Below are a list of some skill-based iOS Developer interview questions.

1. Are you comfortable working in a team environment?
2. How well do you know the Swift programming language?
3. What are some of the most important skills for an IOS developer?
4. What kind of projects have you worked on so far in your career, and what were the main technologies behind them?
5. Can you describe a situation where you were faced with a major professional challenge? How did you handle it?
6. What are some of your favorite recent iOS features?
7. How large were the teams you worked with until now, and were you ever a team leader on a project?
8. Can you tell me about a time when you disagreed with your manager's decision? How did you handle the situation?
9. Have you ever been in charge of an iOS-related project?
10. How would you describe the IOS operating system?
11. What are Cocoa and Cocoa Touch?
12. What makes IOS different from other mobile operating systems?
13. What do you think is the most challenging part of IOS development?
14. What is the difference between a delegate and a data source in IOS?
15. What are Cocoa and Cocoa Touch?
16. Do you have experience working with storyboards?
17. Provide an example of when you used a block in IOS.
18. If you could only use three tools to develop an IOS app, what would they be?
19. When would you use a table view over a collection view?
20. Which API would you say is most appropriate for writing test scripts that exercise an app's UI elements?
21. How does iOS support multi-threading?
22. What security measures do you take when working on an application?
23. Explain MVC. How is it implemented in iOS?
24. Why is React Native especially effective for iOS?
25. What is the functionality of managed-object context?
26. We want to make changes to an app you previously developed. How would you approach the update?
27. Which mobile devices have you personally used?
28. What’s your process to troubleshoot a crashing application?
29. Describe atomic and nonatomic synthesized properties. What are the key differences? 
30. What iOS frameworks do you have experience working with?
31. Describe the differences between Key-Value Coding and Key-Value Observing.
32. What’s your area of expertise? What are you currently learning about?  
33. Have you designed new features to make an application run faster? What was the outcome?
34. What application design are you most proud of? How did it change your career?
35. What is Enum or Enumerations?
36. What is a bounding box?
37. What are the differences between “app ID” and “bundle ID,” and what are their uses?
38. What framework do you use to build an application's user interface for iOS?
39. How do you prioritize usability in design?
40. What is an ABI?
41. Can you mention and briefly describe all different annotations available in Objective-C?
42. How many APIs are there for battery-efficient location tracking? Can you briefly describe them?
43. What are some of the main advantages of Swift?
44. Can you describe the difference between fileprivate, private and public access levels?
45. What is the main difference between BDD and TDD?
46. What are the main benefits of writing tests in iOS apps?
47. What are the five essential practical guidelines that you can use to improve the typographical quality of your mobile product designs?
48. How much experience do you have testing with VoiceOver?
49. How would you explain Dynamic Type to a new iOS developer?
50. What are the main problems we need to solve when making accessible apps?
51. What accommodations have you added to apps to make them more accessible?
52. How do you create your UI layouts – storyboards or in code?
53. How would you add a shadow to one of your views?
54. How would you round the corners of one of your views?
55. What are the advantages and disadvantages of SwiftUI compared to UIKit?
56. What do you think is a sensible minimum iOS deployment target?
57. What features of recent iOS versions were you most excited to try?
58. What kind of settings would you store in your Info.plist file?
59. What is the purpose of size classes?
60. What happens when Color or UIColor has values outside 0 to 1?

iOS Developer Interview Questions and Answers

Every interview is different and the questions may vary. However, there are lots of general questions that get asked at every interview.

Below are some common questions you'd expect during iOS Developer interviews. Click on each question to see how to answer them.

1. Why Do You Want To Leave Your Current Job?
2. What is Your Greatest Strength?
3. Tell Me About Yourself
4. Why Do You Want This Job?
5. Are You a Leader or a Follower?
6. What Is Your Greatest Accomplishment?
7. What is Your Salary Expectation?
8. Do You Have Any Questions for Us?
9. Why Should We Hire You?
10. What is Your Greatest Weakness?

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