What are benefits of collections views?

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Explain the difference between uiwindow and uiview?

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What is kvc and kvo?

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How can we put nil it into dictionary/array?

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What is gcd?

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What does @synchronized() do?

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What are the size classes?

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Can you write setter method for a retain property?

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How to make a code snippet thread safe?

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What is delegate? Can delegates be retained?

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Explain when to use nsarray and nsmutablearray. Which one is faster and threadsafe?

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Explain what is #import?

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Mention whether nsobject is a parent class or derived class.

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Explain the difference in xib/storyboard vs nib?

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Why create a custom view?

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