UIViewController using a delegate pattern

gistfile1.m

@class BookViewController;

@protocol BookViewControllerDelegate
- (void)bookViewControllerDidCancel:(BookViewController *)controller;
- (void)bookViewControllerDidSave:(BookViewController *)controller;
@end

@interface BookViewController : UIViewController {
	id <BookViewControllerDelegate> delegate_;
}

@property (nonatomic, assign) id <BookViewControllerDelegate> delegate;

@end