What are all the difference between iOS3, iOS4 and iOS5?
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Outline the class hierarchy for a UIButton until NSObject.
Bundle & document directory, sandbox ?
What is gcd? How is it used?
What is the difference between NSArray and NSMutableArray in iOS operating system?
How do you create a fetched property?
Explain layer objects?
What is a weak var?
What does ios stand for in texting?
Explain ~/documents, ~/library, ~/tmp. What directory is ~ on ios?
What is automatic reference counting (arc)?
Explain what is the stack of autorelease pools. How autorelease pool work under the hood?
What language is ios based on?