What is a category and when is it used?


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More Apple iOS Interview Questions

Is viewdidload only called once?

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How core data differs from sqlite?

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What are the different store migration options? When are they used? How do they work? What is mapping model?

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Why core data is faster than sqlite?

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What is the difference between atomic and nonatomic properties? Which is the default for synthesized properties?

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What is nsmanagedobjectcontext? What are the different concurrency types? Explain them.

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Whats the difference between  NSArray and  NSMutableArray?

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Enlist the methods to achieve concurrency in ios?

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What is the use of the UI Automation API?

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Introduction to iphone application development?

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Explain code signing in ios?

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What is singleton class in ios?

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