/*

     File: AppDelegate.m

 Abstract: The delegate for the Application. This manages which view controller is added to the window at launch.

  Version: 1.3

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 */

#import "AppDelegate.h"

#import "PhotoViewController.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    // kick things off by making the first page

    PhotoViewController *pageZero = [PhotoViewController photoViewControllerForPageIndex:0];

    if (pageZero != nil)

    {

        // assign the first page to the pageViewController (our rootViewController)

        UIPageViewController *pageViewController = (UIPageViewController *)self.window.rootViewController;

        pageViewController.dataSource = self;

        [pageViewController setViewControllers:@[pageZero]

                                      direction:UIPageViewControllerNavigationDirectionForward

                                       animated:NO

                                     completion:NULL];

    }

    return YES;

}

- (UIViewController *)pageViewController:(UIPageViewController *)pvc viewControllerBeforeViewController:(PhotoViewController *)vc

{

    NSUInteger index = vc.pageIndex;

    return [PhotoViewController photoViewControllerForPageIndex:(index - 1)];

}

- (UIViewController *)pageViewController:(UIPageViewController *)pvc viewControllerAfterViewController:(PhotoViewController *)vc

{

    NSUInteger index = vc.pageIndex;

    return [PhotoViewController photoViewControllerForPageIndex:(index + 1)];

}

@end