What is a retain cycle?
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How do you create a fetched property?
When is an app said to be in active state?
Name the application thread from where uikit classes should be used?
What is the difference between release and autorelease?
What is made up of nserror object?
Who developed ios?
What is gcd? How is it used?
Assume that your app is running in the foreground but is currently not receiving events. In which sate it would be in?
What is the difference between viewdidload and viewdidappear?
What is UIApplication?
What are all the instruments available in Xcode in iOS operating system?
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What is category and class extension? How these differ?