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Simple UIPageViewController

To use UIPageViewController effectively you would need an UIPageViewControllerDataSource, this will help to display the before and after UIViewController. Here is an simple implementation to get you started:

#import <UIKit/UIKit.h>

@interface PYPageViewController : UIPageViewController
@property NSMutableArray *pages;
@end

#import "PYPageViewController.h"

@interface PYPageViewController()
@end

@implementation PYPageViewController
@synthesize pages;

- (void)viewWillAppear:(BOOL)animated {
    [self setDataSource:(id)self]; //Use this class as the data source
    self.pages  = [[NSMutableArray alloc]initWithCapacity:3];
    [self.pages addObject:[self.storyboard instantiateViewControllerWithIdentifier:@"PYRootViewController"]];
    [self.pages addObject:[self.storyboard instantiateViewControllerWithIdentifier:@"PYNextViewController"]];
    [self.pages addObject:[self.storyboard instantiateViewControllerWithIdentifier:@"PYEndViewController"]];
    [self setViewControllers:[NSArray arrayWithObject:pages[0]] direction:UIPageViewControllerNavigationDirectionForward animated:true completion:nil];
    [super viewWillAppear:animated];
}

/* UIPageViewControllerDataSource */
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
    UIViewController *view = nil;

    if ([self.pages objectAtIndex:0] != viewController){
        for (NSUInteger i = [self.pages count]-1;i > 0 ; i--) {
            if ([self.pages objectAtIndex:i] == viewController){
                view = [self.pages objectAtIndex:i-1];
                break;
            }
        }
    }
    return view;
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
    UIViewController * view = nil;
    if ([self.pages objectAtIndex:[self.pages count]-1] != viewController){
        for (NSUInteger i = 0;i < [self.pages count]-1; i++) {
            if ([self.pages objectAtIndex:i] == viewController){
                view = [self.pages objectAtIndex:i+1];
                break;
            }
        }
    }
    return view;
}

@end