What are layer objects and what do they represent in iOS operating system?
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What is gcd? How is it used?
Who developed ios?
What is difference strong and weak reference ? Explain.
Explain the options and bars available in xcode 4.x workspace window in iOS operating system
Why do we override drawrect: method? How to explicitly call it?
What is core data in ios swift?
Explain how app delegate is declared by Xcode project templates?
What are the different store migration options?
Define 'retain' keyword?
What is the meaning of 'strong'keyword?
What do you know about the ios kernel?
What is nsmanagedobject?