Setting up Page Curl animation with UIPageViewController - ios

Question

I am new to iOS and I am using UIPageViewController. Here is my code:
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
firstVC *first1 = [[firstVC alloc] initWithNibName:#"firstVC" bundle:nil]; return first1;
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
secondVC *second1 = [[secondVC alloc] initWithNibName:#"secondVC" bundle:nil]; return second1;
}
- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed { NSArray *viewControllers = nil; viewControllers = [NSArray arrayWithObjects:first,second, nil]; [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerSpineLocationMid animated:NO completion:NULL];
}
-(UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation {
NSArray *viewControllers = nil; viewControllers = [NSArray arrayWithObjects:second, first, nil]; [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerSpineLocationMid animated:YES completion:NULL]; return UIPageViewControllerSpineLocationMid;
}
- (void)viewDidLoad { [super viewDidLoad]; [self.navigationController setNavigationBarHidden:NO]; self.navigationController.navigationBar.tintColor = [UIColor blackColor]; self.title = #"DEMO"; NSDictionary *options = [NSDictionary dictionaryWithObject: [NSNumber numberWithInteger:UIPageViewControllerSpineLocationMin] forKey: UIPageViewControllerOptionSpineLocationKey]; self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl navigationOrientation:UIPageViewControllerSpineLocationMid options:options]; self.pageViewController.delegate = self; self.pageViewController.dataSource = self; first = [[firstVC alloc] initWithNibName:#"firstVC" bundle:nil]; second = [[secondVC alloc] initWithNibName:#"secondVC" bundle:nil]; NSArray *viewControllers = [NSArray arrayWithObjects:first,second,nil]; [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerSpineLocationMid animated:NO completion:nil]; [self addChildViewController:self.pageViewController]; [self.view addSubview:self.pageViewController.view]; self.modalPresentationStyle=UIModalPresentationCurrentContext; [self.pageViewController didMoveToParentViewController:self]; CGRect pageViewRect = self.view.bounds; pageViewRect = CGRectInset(pageViewRect, 20.0, 20.0); self.pageViewController.view.frame = pageViewRect; self.view.gestureRecognizers = self.pageViewController.gestureRecognizers; self.pageViewController.doubleSided=YES; }
It is loading double sided pages in both orientations but a problem arises when I swipe the page and only one view is shown. I want a page-like animation. Please help. Thanks in advance for help and support.

Answer 1

where do you initialize your UIPageViewController?
at the point of initializing you MUST define the transition style as it's a readonly property.
The code should look like this;
self.pageViewController = [[UIPageViewController alloc]
initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl
navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal
options:nil];