Quoted from:

UIViewController Class Reference
http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIViewController_Class/Reference/Reference.html#//apple_ref/doc/c_ref/UIViewController

###Example of container view controllers:

• UINavigationController
• UITabBarController

###To implement a Container View Controller
Subclass UIViewController that call the view containment methods:

• addChildViewController:
• removeFromParentViewController
• transitionFromViewController:toViewController:duration:options:animations:completion:
• willMoveToParentViewController:
• didMoveToParentViewController:

###Using containment methods in UINavigationController

pushViewController:animated calls:

• addChildViewController
• transitionFromViewController:toViewController:duration:options:animations:completion:

popViewControllerAnimated calls:

• removeFromParentViewController
• transitionFromViewController:toViewController:duration:options:animations:completion: