Classes/AppDelegate.m

/*
     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