Objective-C Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Objective-C Interview Questions

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Explain what is protocol in objective-c?

What is toll-free bridging?

Explain what is @synthesize in objective-c?

Is objective c, a dynamic language? True/false, explain.

What is kvc and kvo? Give an example of using kvc to set value.

Does a thread created using performselectorinbackground:withobject: creates its own autorelease pool?

Can we create dynamic classes in objective c? If yes, explain how to create with a valid use case?

Who calls dealloc method?

What is responder chain?

What can’t we put into an array or dictionary?

Can I write some c++ function in same .m file?

Can we create dynamic classes in objective c?

What happen if we send any message to an object which is released?

Explain the difference between atomic and nonatomic synthesized properties.

How does dispatch_once manages to run only once?

Un-Answered Questions { Objective-C }

What is the main difference between function calls and messages?

What is the difference between class and category?

What’s the contrast between active, inactive, not-running, background and suspended execution states?

What do you understand by protocol?

What is the difference between polymorphism and abstraction?

Explain what are the attributes of category?

What are the advantages of swift over objective c?

Explain the difference between #import and #include in objective-c?

Can I write some c++ function in same .m file? Will it compile? If no, what changes should I do to compile it?

How messaging works in objective-c?

Why do we require class extension?

What do you mean by cocoa?

What is a selector objective c?

What is better objective c or swift?

What do you mean by category and when to use it?

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