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IOS Interview Questions and Answers

What is the reuse Identifier utilized for?

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Name four important data types found in Objective-C?

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Is multitasking function is supported by iOS?

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Difference between Synchronous & Asynchronous task?

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Which JSON framework is supported by iOS?

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Explain Compilation Conditions?

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Among the different JSON framework which one does support by the iOS?

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What are all the UI elements and some common ways you can add them to your app?

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Explain the difference between atomic and non-atomic synthesized properties?

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Which JSON framework is supported by iOS (iPhone OS)?

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Explain the difference between copy and retain?

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Explain the purpose of the reuseIdentifier in the UITableViewCell constructor:

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What do you understand by the term App Bundle?

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What is made up of NSError object?

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What is the difference between atomic and nonatomic properties? Which is the default for synthesized properties?

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Define bounding box?

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Why don’t we use strong for enum property in Objective-C?

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What is @synthesize in Objective-C?

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What do you understand by Cocoa/Cocoa touch?

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What do you understand by the term NSFetchRequest?

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What do you understand by the word subscripts?

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What are some common execution states in iOS?

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What is method swizzling in Objective C and why would you use it?

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How can you prevent iOS 8 app’s streaming video media from being captured by QuickTime Player on Yosemite during screen recording?

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Difference between not-running, inactive, active, background and suspended execution states?

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What is a category and when is it used?

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Difference between viewDidLoad and viewDidAppear?
Which should you use to load data from a remote server to display in the view?

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What is the purpose of managed object context (NSManagedObjectContext) in Objective-C and how does it work?

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What do you understand by the term NS Persistent Container?

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What do you understand by the term NS Fetched Results Controller?

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Define @dynamic in Objective-C?

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Why do we use synchronized?

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Which are the ways of achieving concurrency in iOS?

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Explain the different types of iOS Application States.

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Which is the framework that is used to construct application’s user interface for iOS?

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What are the different ways to specify the layout of elements in UIView?

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Difference between atomic- and non-atomic properties? Which is default for synthesized properties? When would you use one over the other?

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Describe managed object context and its function.

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What’s your preference when writing UI’s? Xib files, Storyboards or programmatic UIView?

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Determine the value of “x” in the Swift code below. Explain your answer.

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Explain the difference between raw and associated values in Swift.

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Explain the benefits of the guard?

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Explain the terms KVC-KVO

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Explain about the layer objects and where do they present?

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In the case of iOS application getting crashed what are the things you are going to do?

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Depict the reasons why is it better to use higher-order functions?

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Define Responder Chain ?

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What is Regular expressions?

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What is Operator Overloading?

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