What does XCode 4.2 story builder's "Defines Context" and "Provide Context" mean?

Question

In the Navigation Controller Attributes Inspector under View Controller section there are the "Defines Context" and "Provide Context" check boxes.

I cant find any documentation on this features. How to use it and what does it do?

Answer 1

The "Defines Context" checkbox sets the definesPresentationContext property of the view controller. The "Provides Context" checkbox sets the providesPresentationContextTransitionStyle property.

If you want to learn more about these properties, watch WWDC 2011 Session 102: Implementing UIViewController Containment.