iOS Interview Questions and Answers

Last updated on Feb 10, 2022

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iOS, formerly known as iPhone OS, is a mobile OS created and developed by Apple for its hardware. This operating system powers most of Apple’s devices, including iPhones, iPads, and iPod Touch. iOS is the world’s second most popular mobile OS after Android. The iOS UI is based on direct manipulation by using multi-touch. Apple has been active in including accessibility functions into iOS that even enable users with vision and hearing disabilities to use its products properly. If you have read our IOS interview questions, you can find your next dream job soon.

Advantages

User-friendly
Intuitive and fluid responsive
Excellent UI that works equally good for all purposes - media entertainment, gaming and business.
Less heat generated as compared to Android.
Best-in-class security.

Most Frequently Asked iOS Interview Questions

Here in this article, we will be listing frequently asked iOS Interview Questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

Q41. What are the different store migration options? When are they used? How do they work? What is mapping model?

Answer

Q42. Explain parent-child context setup. How does it work? What are the advantages?

Answer

Q43. What is difference between performBlock: and performBlockAndWait:?

Answer

Q44. Are the NSManagedObjectContext queues serial or concurrent?

Answer

Q45. Can you pass same core data objects between different threads and modify?

Answer

Q46. What performance issues can you face when using CoreData?

Answer

Q47. What is NSFetchedResultsController? How do you turn on content monitoring?

Answer

Q48. How to implement "load more" using NSFetchedResultsController? (Hint: Set fetch offset and fetch limit on the NSFetchRequest of the controller, change the request to fetch more results)

Answer

Q49. What are the different delete rules that a relationship can have? Which one takes ownership?

Answer

Q50. In NSFetchRequest can we fetch only a selective few attributes of an entity? How?

Answer

Development History

iOS was unveiled in 2007 by Apple for its iPhone. Since then versions have been released annually.

Latest Version: The latest version is iOS 12, which was released in September 2018. Memorize this information for IOS interview questions and answers.

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