state_restoration_app_delegate.m

- (BOOL)application:(UIApplication *)application willFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    UINavController *centerNav = [[UINavController alloc] initWithRootViewController:[FeaturedViewController new]];
    centerNav.restorationIdentifier = @"centerNav";
    UINavigationController *leftDrawerNavController = [[UINavigationController alloc] initWithRootViewController:[LeftDrawerViewController new]];
    leftDrawerNavController.restorationIdentifier = @"leftDrawerNav";

    MMDrawerController *drawerViewController = [[MMDrawerController alloc] initWithCenterViewController:centerNav leftDrawerViewController:leftDrawerNavController];

    // no restoration class, since this will always be created before state restoration resumes, and therefore will be found implicitly
    [drawerViewController setRestorationIdentifier:@"mmDrawer"];

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.rootViewController = drawerViewController;
    self.window.restorationIdentifier = NSStringFromClass([UIWindow class]);
    self.window.backgroundColor = [UIColor whiteColor];

    [self.window makeKeyAndVisible];
    return true;
}

- (UIViewController *)application:(UIApplication *)application viewControllerWithRestorationIdentifierPath:(NSArray *)identifierComponents coder:(NSCoder *)coder
{
    if ([[identifierComponents lastObject] isEqualToString:@"leftDrawerNav"]) {
        return ((MMDrawerController *)self.window.rootViewController).leftDrawerViewController;
    }

    if ([[identifierComponents lastObject] isEqualToString:@"centerNav"]) {
        return ((MMDrawerController *)self.window.rootViewController).centerViewController;
    }

    return nil;
}