iOS Interview Questions 2019 - Part 1

Questions, Tips and Tricks to clear iOS Interview Questions

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Interview - a common word we hear most in the corporate world.

From a fresher to CEO, everyone needs to appear for an interview at some time. After a few interesting experiences and some research, I found some easy ways to prepare for iOS Developer Interview and crack it with confidence.

General Questions

1. Tell me about your last/current project ?
2. Explain the architecture of your current project ?
3. Tell me about your role in the project ?
4. What are the challenges you faced in the project ?

These four are the most important questions we need to be careful, so answer them clear and confident.

Questions on Swift

1. Difference between Objective-C and Swift (😜 Yeah, I know, since the release of Swift 1.1 in 2014 to till now most interviewers are asking this question first)

2. What is Sequence Protocol ?

3. Difference between GCD and NSOperationQueues ?

4. What is escaping and non escaping closures ?

5. Explain enum with associated type ?

6. What is an extension ?

7. What is a retain cycle ?

8. What is an Iterator Protocol ?

9. Difference between Delegate and NSNotification ?

10. What is an offset ?

11. Difference between class and struct ?

12. What is NSManagedObjects, Managed Object Context and NSPersistentClass ?

13. What are the benefits of NSOperation ?

14. What are the types of closures ?

15. Difference between Foundation and CoreFoundation

16. What are Tuples ?

17. What is optional chaining and optional binding ?

18. What are blocks ?

19. What is Coding key protocol ?

20. What is an @objc inference ?

21. Explain JSONEncoder and JSONDecoder ?

22. What are the different types of Initializers in swift ?

23. What is bounding box ?

24. What is Dynamic Dispatch ?

25. Difference between ANY and ANYOBJECT ?

These are the most common questions asked in a telephonic or first level of technical round.

Questions on Architecture and Best Practices

1. What is VIPER ?

2. Difference between MVVM and VIPER ?

3. What is the role of Interactor in VIPER ?

4. What are Bindings ?

5. What is dependency injection ?

6. What is dependency inversion ?

7. What are SOLID principles ?

8. What is an iOS Snapshot Test ?

9. How to achieve greater code coverage ?

10. How to find memory leaks ?

11. What are the ways to analyse an app crash ?

12. How TDD helps in the development process ?

13. What is SwiftLint ?

14. What are the clean ways to add assets into our project ?

15. Disadvantages of MVC ?

When you’re appearing for a startup or a small scale organisation end to end knowledge is must. Where as in the big companies they have a dedicated team for Release and Deployment of apps in the AppsStore.

1. What are the different type of certificates available ?
2. How many internal and external testers are allowed in iTunesConnect ?
3. What is an UDID ?
4. What is the maximum life time for a test build in iTunesConnect ?
5. What is Continuous Integration and Continuous Deployment ?
6. How does TestFlight works ?
7. Difference between app ID and bundle ID ?
8. What is the difference between version number and build no ?
9. Can we receive push notifications in Adhoc certified test build ?
10. What are provisioning profiles and its types ?

I have seen some of the companies ask to do a small implementation without using the Internet, so prepare yourself to work in those situations.

Checkout part 2 of this series to find the tips and preparation mechanism for system test and advanced technical rounds

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Other Resources

• I would highly recommend analysing yourself with the help of Bohdan Orlov's iOS developer roadmap and iOS developer skill matrix
• Swift Interview Questions and Answers & iOS Interview Questions by raywenderlich
• Basic questions in iOS & Obj-c by ioscodesnippet
• iOS Interview Questions for Senior Developers by sm-cloud
• iOS Interview Questions by onthecodepath