UIPageViewController sets view controller out of the screen - ios

Question

I'm trying to add a UIPageViewController to my App using following code:
- (void)viewDidLoad
{
[super viewDidLoad];
NSArray *viewControllers = #[page0,
page1,
page2];
self.pageController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll
navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal
options:nil];
self.pageController.dataSource = self;
self.pageController.view.frame = self.view.frame;
[self.pageController setViewControllers:#[[viewControllers firstObject]]
direction:UIPageViewControllerNavigationDirectionForward
animated:NO
completion:nil];
[self.pageController willMoveToParentViewController:self];
[self addChildViewController:self.pageController];
[self.view addSubview:self.pageController.view];
[self.pageController didMoveToParentViewController:self];
}
Then problem is that when I run the application, using the Simulator or a physical device, I get a empty screen. If I try to swipe the views I can see that the page that I actually added to the viewControllers array is already there but outside of the screen. Making some debugging with SparkInspector, I can see that the view is actually there but with an offset with the same value equal to the screen width.
I also have implemented the DataSource for the UIPageViewController. Here are the implementation of the delegated methods:
- (NSInteger) presentationCountForPageViewController:(UIPageViewController *)pageViewController {
return 3;
}
- (NSInteger) presentationIndexForPageViewController:(UIPageViewController *)pageViewController {
return 0;
}
- (UIViewController *) pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
if (viewController == nil) {
return [viewControllers firstObject];
}
NSUInteger index = [viewControllers indexOfObject:viewController];
// NSParameterAssert(index != NSNotFound);
index++;
if (index == viewControllers.count) {
return nil;
}
return [viewControllers objectAtIndex:index];
}
- (UIViewController *) pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
if (viewController == nil) {
return [viewControllers firstObject];
}
NSUInteger index = [viewControllers indexOfObject:viewController];
if (index == 0) {
return nil;
}
index--;
return [viewControllers objectAtIndex:index];
}
I cannot see why the App is offsetting the view controllers, so any advice will be very helpful.