What is messaging? How does the runtime handle message passing?
How to register as a iphone developer?
Difference between retain and assign ?
Outline the class hierarchy for a UIButton until NSObject.
What is the difference strong and weak reference?
Multitasking support is available from which version?
What is difference between shallow copy and deep copy in ios ? : IOS Architect
What is core data stack?
What is difference between atomic and nonatomic in ios?
Define iterator protocol?
What is libdispatch?
What is shared instance in ios?
what is singleton class? Why the whole application creates a single instance?