Explain the types of protocol?

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How to call function in objective-c?

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what is gcd? What are advantages over nsthread?

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Can delegates be retained?

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What is class extension?

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Why do we require class extension?

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What are nsautoreleasepool? When to use them?

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What is toll-free bridging? When is it useful?

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When is toll-free bridging useful?

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What happens when you create a block?

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What are the types of ios binaries you can create using xcode?

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Explain how to call function in objective-c?

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Are id and instancetype same? If not, what are differences between them?

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What happens with the objects if the array is released?

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Explain what is dot notation?

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