UIPageViewController not resizing its child view controllers on rotation - ios

Question

I am trying to use UIPageViewController with view controllers added to it, problem is if I launch the app in portrait mode it appears perfectly like this:
but if I rotate the device to landscape mode it appears like this:
Though pagination control has resized properly, view of added view controller has not resized properly.
Below is the code which I have used to add respective view controller as root view controller in AppDelegate:
pagesContainerViewController = [[RWPagesContainerViewController alloc] initWithNibName:#"RWPagesContainerViewController" bundle:nil];
[pagesContainerViewController loadPaginationControlAtIndex:0];
self.window.rootViewController = pagesContainerViewController;
Here is the implementation of loadPaginationControlAtIndex method:
- (void)loadPaginationControlAtIndex:(RWPaginationView)viewIndex {
_pageController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
FirstViewController *firstViewController = [[FirstViewController alloc] initWithNibName:#"FirstViewController" bundle:nil];
SecondViewController *secondViewController = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
ThirdViewController *thirdViewController = [[ThirdViewController alloc] initWithNibName:#"ThirdViewController" bundle:nil];
_subviewControllers = #[firstViewController, secondViewController, thirdViewController];
[self.pageController setViewControllers:#[_subviewControllers[viewIndex]] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
[self addChildViewController:self.pageController];
[[self view] addSubview:[self.pageController view]];
UIView *insertedView = self.pageController.view;
insertedView.translatesAutoresizingMaskIntoConstraints = NO;
self.view.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:|[insertedView]|"
options:0
metrics:nil
views:NSDictionaryOfVariableBindings(insertedView)]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:|[insertedView]|"
options:0
metrics:nil
views:NSDictionaryOfVariableBindings(insertedView)]];
[self.view layoutIfNeeded];
self.pageController.dataSource = self;
}
Am I missing anything? Please suggest.

Answer 1

when the application loads or when your view loads:
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter]
addObserver:self selector:#selector(orientationChanged:)
name:UIDeviceOrientationDidChangeNotification
object:[UIDevice currentDevice]];
Then add the following method:
- (void) orientationChanged:(NSNotification *)note
{
[self.pageController setViewControllers:#[_subviewControllers[currentIndex]] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
}