UIPageViewController and storyboard

UIPageViewController and storyboard

I'm trying to configure a UIPageViewController from storyboard:

TutorialPageViewController.h
#import <UIKit/UIKit.h>
@interface TutorialPageViewController : UIPageViewController
<UIPageViewControllerDelegate, UIPageViewControllerDataSource>
@end
TutorialPageViewController.m
#import "TutorialPageViewController.h"
@interface TutorialPageViewController ()
@property (assign, nonatomic) NSInteger index;
@end
@implementation TutorialPageViewController
{
NSArray *myViewControllers;
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle
*)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
self.delegate = self;
self.dataSource = self;
[self didMoveToParentViewController:self];
UIStoryboard *tutorialStoryboard = [UIStoryboard
storyboardWithName:@"TutorialStoryboard" bundle:[NSBundle
mainBundle]];
UIViewController *tuto1 = [tutorialStoryboard
instantiateViewControllerWithIdentifier:@"TutorialPageViewController_1"];
UIViewController *tuto2 = [tutorialStoryboard
instantiateViewControllerWithIdentifier:@"TutorialPageViewController_2"];
myViewControllers = @[tuto1, tuto2, tuto1, tuto2];
self.index = 0;
[self setViewControllers:@[tuto1]
direction:UIPageViewControllerNavigationDirectionForward animated:NO
completion:nil];
}
- (UIViewController *)viewControllerAtIndex:(NSUInteger)index {
return myViewControllers[index];
}
- (UIViewController *)pageViewController:(UIPageViewController
*)pageViewController viewControllerBeforeViewController:(UIViewController
*)viewController {
NSUInteger index = self.index;
if (index == 0) {
return nil;
}
// Decrease the index by 1 to return
index--;
return [self viewControllerAtIndex:index];
}
- (UIViewController *)pageViewController:(UIPageViewController
*)pageViewController viewControllerAfterViewController:(UIViewController
*)viewController {
NSUInteger index = self.index;
index++;
if (index > [myViewControllers count]) {
return nil;
}
return [self viewControllerAtIndex:index];
}
- (NSInteger)presentationCountForPageViewController:(UIPageViewController
*)pageViewController {
// The number of items reflected in the page indicator.
return [myViewControllers count];
}
- (NSInteger)presentationIndexForPageViewController:(UIPageViewController
*)pageViewController {
// The selected item reflected in the page indicator.
return 0;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
Problem is...
The first page displays well with the page indicator. While swiping,
I can see properly the second page.
As soon as the transition finishes, I get a black screen (with the page
indicator properly displaying page number 2). No user interaction is
available anymore.