Subclass of UIPageViewController that fix the Alzheimer bug

SPKPageViewController.h

#import <UIKit/UIKit.h>

@interface SPKPageViewController : UIPageViewController

@end

SPKPageViewController.m

#import "SPKPageViewController.h"

@implementation SPKPageViewController

- (void)setViewControllers:(NSArray *)viewControllers direction:(UIPageViewControllerNavigationDirection)direction animated:(BOOL)animated completion:(void (^)(BOOL finished))completion
{
    __block typeof(self) bSelf = self;
    
    [super setViewControllers:viewControllers
                    direction:direction
                     animated:animated
                   completion:^(BOOL finished) {
                       
                       // FIX: bug fix for UIPageViewController
                       // http://stackoverflow.com/a/17330606/839233
                       // On iOS8 this bug seams to be resolved
                       if (animated && finished) {
                           dispatch_async(dispatch_get_main_queue(), ^{
                               [bSelf setViewControllers:viewControllers
                                                                  direction:direction
                                                                   animated:NO
                                                                 completion:completion];
                           });
                       }
                       else {
                           
                           if (completion) {
                               completion(finished);
                           }
                       }
                       
                   }];
}

@end