Using UIPageViewController with Multiple Views - ios

Question

I have the following code to create a UIPageViewController:
- (void)viewDidLoad
{
[super viewDidLoad];
self.index = 0;
self.pageContainer = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
self.pageContainer.dataSource = self;
[[self.pageContainer view] setFrame:[[self view] bounds]];
DMSignUp1ViewController *first = [[DMSignUp1ViewController alloc] init];
DMSignUp2ViewController *second = [[DMSignUp2ViewController alloc] init];
self.viewControllers = [[NSArray alloc] initWithObjects:first, second, nil];
[self.pageContainer setViewControllers:self.viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
[self addChildViewController:self.pageContainer];
[[self view] addSubview:[self.pageContainer view]];
[self.pageContainer didMoveToParentViewController:self];
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
if(self.index == 0) {
return nil;
}
self.index--;
return [self.viewControllers objectAtIndex:self.index];
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
if(self.index == 1) {
return nil;
}
self.index++;
return [self.viewControllers objectAtIndex:self.index];
}
I have two UIViewControllers: DMSignUp1 and 2 which I create and then place in the viewControllers array.
When I go to run it, I get the following error: 'The number of view controllers provided (2) doesn't match the number required (1) for the requested transition'
Which I understand is because I am passing the array to use as the view controller. So how do I set that I want to use the first view controller in the array?

Answer 1

Add the following method at the end of the ViewController.m file
- (DMSignUp1ViewController *)viewControllerAtIndex:(NSUInteger)index {
DMSignUp1ViewController *first= [[DMSignUp1ViewController alloc] initWithNibName:#"APPChildViewController" bundle:nil];
first.index = index;
return childViewController;
}
And, replace the following code
DMSignUp1ViewController *first = [[DMSignUp1ViewController alloc] init];
DMSignUp2ViewController *second = [[DMSignUp2ViewController alloc] init];
self.viewControllers = [[NSArray alloc] initWithObjects:first, second, nil];
With
APPChildViewController *initialViewController = [self viewControllerAtIndex:0];
NSArray *viewControllers = [NSArray arrayWithObject:initialViewController];
[self.pageController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
Hope this might help you...

Answer 2

If you have the UIPageViewController spineLocation set to anything other than UIPageViewControllerSpineLocationMid when you're using [self.pageContainer setViewControllers: you can only pass an array with one view controller. The API isn't very clear really with it saying Controllers. You then provide the additional viewControllers when the UIPageViewController requests them through the dataSource.
Link to the spine reference.