Example
- Init array of view controllers which will be managed by UIPageViewController. Add a base view controller class which has property
identifier which will be used to identify view controllers when working with UIPageViewController data source methods. Let the view controllers to inherit from that base class.
UIViewController *firstVC = [[UIViewController alloc] init];
firstVC.identifier = 0
UIViewController *secondVC = [[UIViewController alloc] init];
secondVC.identifier = 1
NSArray *viewControllers = [[NSArray alloc] initWithObjects: firstVC, secondVC, nil];
- Create UIPageViewController instance.
UIPageViewController *pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll
navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal
options:nil];
- Data source is current class which must implement
UIPageViewControllerDataSource protocol.
pageViewController.dataSource = self;
setViewControllers will add only first view controller, next will be added to the stack using data source methods
if (viewControllers.count) {
[pageViewController setViewControllers:@[[viewControllers objectAtIndex:0]]
direction:UIPageViewControllerNavigationDirectionForward
animated:NO
completion:nil];
}
- Add UIPageViewController as a child view controller so it will receive from it's parent view controller
appearance and rotation events.
[self addChildViewController:pageViewController];
pageViewController.view.frame = self.view.frame;
[self.view addSubview:pageViewController.view];
[pageViewController didMoveToParentViewController:self];
- Implementing UIPageViewControllerDataSource methods
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController
viewControllerBeforeViewController:(UIViewController *)viewController
{
index = [(Your View Controler Base Class *)viewController identifier];
index--;
return [self childViewControllerAtIndex:index];
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController
viewControllerAfterViewController:(UIViewController *)viewController
{
index = [(Your View Controler Base Class *)viewController identifier];
index++;
return [self childViewControllerAtIndex:index];
}
- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController
{
return [viewControllers count];
}
- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController
{
return index;
}
- Utility method which returns a view controller using an index, if index is out of bounds it returns nil.
- (UIViewController *)childViewControllerAtIndex:(NSInteger)index
{
if (index <= ([viewControllers count] - 1)) {
return [viewControllers objectAtIndex:index];
} else {
return nil;
}
}
