UIPageViewController

MainContentViewController.h

#import <UIKit/UIKit.h>

@interface MainContentViewController : UIViewController

@property (nonatomic) NSInteger index;

@end

MainViewController.m

#import "MainViewController.h"

@interface MainViewController () <UIPageViewControllerDataSource, UIPageViewControllerDelegate>

@end

@implementation MainViewController
{
    UIPageViewController *pageViewController;
    UIPageControl *pageControl;
    
    NSUInteger pageCount;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    pageCount = 8;
  
    pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
    [pageViewController setViewControllers:@[[self viewControllerAtIndex:0]] direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
    pageViewController.dataSource = self;
    pageViewController.delegate = self;
    
    [self addChildViewController:pageViewController];
    [self.view addSubview:pageViewController.view];
    [pageViewController didMoveToParentViewController:self];
}

- (UIViewController *)viewControllerAtIndex:(NSInteger)index
{
    if (index < 0 || index > pageCount-1) return nil;
    
    UIViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:@"MainContentViewController"];
    
    [vc setValue:@(index) forKey:@"index"];
    vc.view.tag = index;
    
    else vc;
}

- (void)pageViewController:(UIPageViewController *)pageViewCntr didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed
{
    NSInteger currentIndex = ((UIViewController *)pageViewController.viewControllers.firstObject).view.tag;
    if (completed) pageControl.currentPage = currentIndex;
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
    NSInteger index = ((MainContentViewController *)viewController).index;
    
    if (index == NSNotFound || !index) return nil;
    
    return [self viewControllerAtIndex:index-1];
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
    NSInteger index = ((MainContentViewController *)viewController).index;
    
    if (index == NSNotFound || index == pageCount-1) return nil;
    
    return [self viewControllerAtIndex:index+1];
}