Application delegate methods
 View controller delegate methods
 Table view datasource and delegate methods
 What is a size class
 Can we have multiple UIWindow in an iOS application.
 How to override a UIView and draw to new contents to it.
 How to redraw a UIView?
 What is the use of load view?
 Can we retain a delegate method ?
 Sax vs Dom parsers
 NSXML parser delegate methods
 Incase if we need to parse a large xml document which parser would be efficient and why (DOM or SAX)