UIPageViewController Child's viewWillAppear: & viewDidAppear: transition calls

Question

How does one ensure that the viewWillAppear: and viewDidAppear: (and other view transition methods) are called on a UIPageViewController's child ViewControllers?

In my case, the view transition methods are adequately called on all except for the very firstViewController that the UIPageViewController opens to. On that firstViewController, the viewDidAppear: and viewWillAppear: methods are actually called BEFORE the UIPageViewController's view transition methods. And then as one starts scrolling, the viewWillAppear: and viewDidAppear: methods are called as one would expect for the new view controllers.

Here is my structure: I have a BossViewController that contains an OrganizerViewController (a couple different organizers, actually, but that is irrelevant). The OrganizerViewController contains a UIPageViewController, which contains a series of CustomViewControllers. My code adequately calls the child view transition methods as per apple (https://developer.apple.com/library/ios/featuredarticles/ViewControllerPGforiPhoneOS/ImplementingaContainerViewController.html) for the interactions between the BossViewController and the OrganizerViewController (fully functional, perfectly so). The problem lies somewhere between the OrganizerViewController, it's child UIPageViewController, and it's first child CustomPageViewController.

I have tried calling beginAppearanceTransition: and endAppearanceTransition: within the UIPageViewController's viewWillAppear: and viewDidAppear: - but that resulted in an 'unbalanced calls' error log to console.

Here is the UIPageViewController set up code, all of which is in the OrganizerViewController:

- (void)configurePVC
{
    NSDictionary *key = @{UIPageViewControllerOptionInterPageSpacingKey : @([UIScreen mainScreen].bounds.size.width * 0.5)};
_pvc = [[AVSCustomPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll
                                       navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:key];
    self.pvc.delegate = self;
    self.pvc.dataSource = self;

    _pvcArray = [[NSMutableArray alloc] init];

    CustomViewController *daily = (CustomViewController *)[self viewControllerAtIndex:6];
    self.index = 6;

    [self.pvcArray addObject:daily];

    [self.pvc setViewControllers:self.pvcArray
                   direction:UIPageViewControllerNavigationDirectionForward
                    animated:YES
                  completion:nil];

    [self addChildViewController:self.pvc];
    [self.dailyContainerView addSubview:self.pvc.view];
    self.pvc.view.frame = self.dailyContainerView.bounds;
    [self.pvc didMoveToParentViewController:self];
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
    NSUInteger index = [(CustomViewController *)viewController index];
    if (index == 0) {
        return nil;
    }
    index--;

    return [self viewControllerAtIndex:index];
}

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

    NSUInteger index = [(CustomViewController *)viewController index];
    if (index == 6) {
        return nil;
    }
    index++;

    return [self viewControllerAtIndex:index];
}
- (UIViewController *)viewControllerAtIndex:(NSUInteger)index
{
    CustomViewController *viewController = [[CustomViewController alloc] init];
    viewController.index = index;


    return viewController;
}