What is nspersistentstorecoordinator?
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What is difference between 'protocol' and 'delegate'?
How to delete images in ios?
Is core data is thread safe?
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Explain the difference between strong and retain.
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Explain how an autorelease pool works at the runtime level
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What are all the difference between iOS3, iOS4 and iOS5?
What is the difference between copies & retain in iOS operating system?
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