Define 'retain' keyword?
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What are some common execution states in ios?
Assume that your app is running in the foreground but is currently not receiving events. In which sate it would be in?
Explain how an autorelease pool works at the runtime level
What are ibeacons?
What is autorealease pool?
what are the two different smart groups in Xcode?
Explain me what is arc? How it works?
Is appdelegate a singleton?
What are layer objects and what do they represent in iOS operating system?
How are non-atomic and atomic properties different?
What is UICollectionView ?
How respond to state transitions on your app in ios?