The detail view controller is much simpler than the master view controller, and it focuses on the user interface. It has relatively little to do with iCloud: the master view controller handles the direct interaction with iCloud at the document level, and the
WrappedFile class manages the transfer of data to and from iCloud after a document has been selected.
The header file is shown in Listing 15.14
#import <UIKit/UIKit.h>#import "JFWrappedDocument.h" //1#import "JFFileRepresentation.h" //2@interface JFDetailViewController : UIViewController<UISplitViewControllerDelegate,