Apple iOS Interview Questions
Questions Answers Views Company eMail

What is iOS?  

2 1048

What's fast enumeration?

2 997

What are the differences between categories and extensions?

1 825




What is a singleton?

1 720

Name and explain the iOS app states.

1 865

What are the memory management rules?

1 806

Name the memory management rules and their related methods.

1 827

Explain why delegates and notifications are different.

1 779




What is lazy loading?

1 860

Explain shallow copying and depth copying.

1 712

What is a struct?

1 829

Is the object retained if I call performSelector:withObject:afterDelay:?

1 1207

What is posing in iOS?

1 1682

Where do you test the developed apps if you do not have the device?

1 705

Does iOs supports multitasking?

1 769


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Un-Answered Questions { Apple iOS }

What happens when you invoke a method on a nil pointer?

1243


How to do upload of large sized video file to server ? while uploading user presses “Homebutton” How long will execute?

414


How to convert MVC design pattern to MVVM design patterns

461


Explain what is the stack of autorelease pools. How autorelease pool work under the hood?

434


Explain which all events will perform an ios application in background

587






DB updation when app new version comes ?

320


Explain Apple push notification

417


Explain @synchronized ,@dynamic

695


How will you implement sets and the intersection operation? Complexity?

381


what is the difference between nonatomic & atomic ? which is thread safe and why

485


When dealing with property declarations, what is the difference between atomic and non-atomic?

495


Explain how an autorelease pool works at the runtime level

1392


what is your preferred programming language? Why? How long will it take you to learn a new programming language?

382


Difference b/w collectionView & uitableview?

750


Explain application states

343