How to implement UIPageViewController that utilizes multiple ViewControllers

Question

I\'ve been working on a simple test app to learn the ins and outs of the UIPageViewController. I have it working but I\'m not convinced my execution is the best way. I hop

Answer 1

@interface ViewController ()
{
    NSMutableArray * StoryboardIds;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    StoryboardIds = [[NSMutableArray alloc]init];
    [StoryboardIds addObject:@"vc1"];
    [StoryboardIds addObject:@"vc2"];

    UIViewController *selectedController = [self viewControllerAtIndex:0];

    self.ProfilePageViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PageControl"];
    self.ProfilePageViewController.dataSource = self;

    _viewcontrollers = [NSMutableArray new];

    [_viewcontrollers addObject:selectedController];

    [self.ProfilePageViewController setViewControllers:_viewcontrollers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];

    // Change the size of page view controller
    self.ProfilePageViewController.view.frame = CGRectMake(0, 0, self.bodypage.frame.size.width, self.bodypage.frame.size.height);

    [self addChildViewController:self.ProfilePageViewController];
    [self.ProfilePageViewController.view setFrame:self.bodypage.bounds];
    [self.bodypage addSubview:self.ProfilePageViewController.view];
    [self.ProfilePageViewController didMoveToParentViewController:self];

}
- (UIViewController *)viewControllerAtIndex:(NSUInteger)index
{
    if (([StoryboardIds count] == 0) || (index >= [StoryboardIds count])) {
        return nil;
    }

    if (index == 0) {
        vc1 *fvc = [self.storyboard instantiateViewControllerWithIdentifier:@"vc1"];
        fvc.Pageindex = index;
        if ([_viewcontrollers count]) {
            [_viewcontrollers replaceObjectAtIndex:0 withObject:fvc];
        }
        return fvc;
    }
    else
    {
        vc2 *fvc = [self.storyboard instantiateViewControllerWithIdentifier:@"vc2"];
        fvc.Pageindex = index;
        if ([_viewcontrollers count]) {
            [_viewcontrollers replaceObjectAtIndex:0 withObject:fvc];
        }
        return fvc;
    }

}

-(NSUInteger)indexofViewController
{
    UIViewController *currentView = [self.ProfilePageViewController.viewControllers objectAtIndex:0];

    if ([currentView isKindOfClass:[vc2 class]]) {
        return 1;
    }
    else{
        return 0;
    }

}


- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {

    NSUInteger index = [self indexofViewController];

    if ((index == 0) || (index == NSNotFound)) {
        return nil;
    }

    index--;
    return [self viewControllerAtIndex:index];
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {

    NSUInteger index = [self indexofViewController];

    if (index == NSNotFound) {
        return nil;
    }

    index++;

    if (index == [StoryboardIds count]) {
        return nil;
    }
    return [self viewControllerAtIndex:index];
}