Preventing the white gap that appears on swiping UIPageViewController

Question

I have implemented the UIPageViewController in this manner:

GalleryViewController

Answer 1

So it appears that the view's frame is not correct before the animation takes place. Try setting up the frame before it starts to come on screen. Something like:

func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {

    var index = (viewController as PageContentViewController).pageIndex!
    if(index <= 0){
        return nil
    }
    index--

    // Setting up the new view's frame
    var newVC = self.viewControllerAtIndex(index)
    newVC.view.frame = self.pageViewController.view.bounds
    return newVC
}