What is the difference strong and weak reference?
What is nspersistentstore? Is it thread safe?
How core data works to save data in persistent storage?
Is xcode a framework?
What is @implementation?
What is @dynamic in objective-c ?
Can you pass same core data objects between different threads and modify?
What is category in ios?
Please explain what is difference strong and weak reference?
Which object manage the presentation of app's content on the screen?
What is cocoa touch framework in ios?
What is iphone sdk?
What is the difference between copies & retain in iOS operating system?
Explain how an autorelease pool works at the runtime level
Why uicontrol is provided if we can create custom uiview?