iOS Programming: The Big Nerd Ranch Guide

Restoring View Controllers

Since the two view controllers have a restoration class, the restoration class will be asked to create new instances of their respective view controller. In BNRItemsViewController.h, have the view controller conform to the UIViewControllerRestoration protocol.

@interface BNRItemsViewController : UITableViewController <UIViewControllerRestoration>

@end

Then, in BNRItemsViewController.m, implement the one required method for this protocol, which will return a new view controller instance.

+ (UIViewController *)viewControllerWithRestorationIdentifierPath:(NSArray *)path
                                                            coder:(NSCoder *)coder
{
    return [[self alloc] init];
}

Now do the same for BNRDetailViewController. Open BNRDetailViewController.h ...