What is the difference between atomic and non-atomic properties? Which is the default for synthesized properties? When would you use one over the other?

757

How can an operating system improve battery life while running an app in iOS operating system?

796

Explain the difference between bounds and frame?

833

What is the difference between viewdidload and viewwillappear?

825

what are the two different smart groups in Xcode?

919

What is synchronized() block in objective c? What is the use of that?

813

What is singleton pattern in ios?

774

What is latest mac os version?

882

Explain app's state transitions when it gets launched?

726

What is atomic and nonatomic in iOS operating system? What is run loop in iOS ?

842

Which is the framework that is used to construct application’s user interface for ios?

768

Define ipa?

775

Difference between cocoa, cocoa touch and objective c?

784

Explain about the applications that can be used with iphone ?

830

What are the 7 osi layers?

811