What is nsoperation and nsoperationqueue?
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What is the use of controller object UIApplication?
What is the extension of ios files?
Explain keywords alloc and new?
what is the difference between Xcode, Cocoa and Objective C?
Explain @synchronized ,@dynamic
Can viewdidload be called multiple times?
What is iphone sdk?
What is uiviewcontroller in ios?
What widgets can not do ?
How to run xcode and other tools with the iphone sdk?
How is the app delegate is declared by Xcode project templates?
What is a weak var?