How declare methods in objective c? And how to call them?

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What is difference between nsstring and nsmutablestring?

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What is nonatomic in objective c?

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What number distinctive annotations is accessible in objective-c?

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How does dispatch_once manages to run only once?

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What is property in objective c?

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What is toll-free bridging and when is it useful?

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Is objective c hard?

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

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How to convert data to string in objective c?

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Explain what is the principle distinction between the function calls and messages?

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What is a .m file in xcode?

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What is a protocol in objective c?

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

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How do you add a category in objective c?

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