ContainerViewController

gistfile1.m

//============ AppDelegate ===============

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    NSMutableArray *controllers = [NSMutableArray array];
    
    ViewController *redController = [[ViewController alloc] initWithNibName:nil bundle:nil];
    redController.view.backgroundColor = [UIColor redColor];
    [controllers addObject:redController];
    
    ViewController *greenController = [[ViewController alloc] initWithNibName:nil bundle:nil];
    greenController.view.backgroundColor = [UIColor greenColor];
    [controllers addObject:greenController];
    
    ViewController * blueController = [[ViewController alloc] initWithNibName:nil bundle:nil];
    blueController.view.backgroundColor = [UIColor blueColor];
    [controllers addObject:blueController];
    
    ViewController * purpleController = [[ViewController alloc] initWithNibName:nil bundle:nil];
    purpleController.view.backgroundColor = [UIColor purpleColor];
    [controllers addObject:purpleController];
    
    ViewController * blackController = [[ViewController alloc] initWithNibName:nil bundle:nil];
    blackController.view.backgroundColor = [UIColor blackColor];
    [controllers addObject:blackController];
    
    ViewController * whiteController = [[ViewController alloc] initWithNibName:nil bundle:nil];
    whiteController.view.backgroundColor = [UIColor whiteColor];
    [controllers addObject:whiteController];
    
    ContainerViewController *viewController = [[ContainerViewController alloc] initWithViewControllers: controllers];
    viewController.view.backgroundColor = [UIColor scrollViewTexturedBackgroundColor];
    
    self.window.rootViewController = viewController;
    
    [self.window makeKeyAndVisible];
    return YES;
}

//============ ContainerViewController ==============

@interface ContainerViewController () <UIPageViewControllerDataSource, UIPageViewControllerDelegate>

@property (nonatomic, strong) NSMutableArray *controllers;
@property (nonatomic, strong) UIPageViewController *pageViewController;

@end

@implementation ContainerViewController

- (id)initWithViewControllers:(NSMutableArray *)controllers
{
    self = [super initWithNibName:nil bundle:nil];
    if (self) {
        self.controllers = controllers;
        
        self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll
                                                                  navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal
                                                                                options:[NSDictionary dictionaryWithObject:[NSNumber numberWithFloat:28.0f] forKey:UIPageViewControllerOptionInterPageSpacingKey]];
        self.pageViewController.view.frame = CGRectMake(0.0f, 0.0f, 320.0f, 568.0f);
        self.pageViewController.delegate = self;
        self.pageViewController.dataSource = self;
        [self.pageViewController setViewControllers:[NSArray arrayWithObject:[controllers objectAtIndex:0] ] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:^(BOOL finished) {
            // Nothing to see here
        }];
        
        [self addChildViewController:self.pageViewController];
        [self.view addSubview:self.pageViewController.view];
    }
    return self;
}

#pragma mark UIPageViewControllerDelegate

- (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray *)pendingViewControllers
{
    // Nothing to see here
}

- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed
{
    // Nothing to see here
}

#pragma mark UIPageViewControllerDataSource

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
    int index = [self.controllers indexOfObject:viewController];
    if (index - 1 >= 0)
    {
        return [self.controllers objectAtIndex:index - 1];
    }
    return nil;
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
    int index = [self.controllers indexOfObject:viewController];
    if (index + 1 < [self.controllers count])
    {
        return [self.controllers objectAtIndex:index + 1];
    }
    return nil;
}

- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController
{
    return [self.controllers count];
}

- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController
{
    return [self.controllers indexOfObject:[pageViewController.viewControllers objectAtIndex:0]];
}

This is the most simple code i have found on net. And it is easiest to understand. Thanks Justin.