Get scroll position of UIPageViewController

Question

I am using a UIPageViewController, and I need to get the scroll position of the ViewController as the users swipe so I can partially fade some assets while the

Answer 1

To make the code as readable and separated as possible, I would define an extension on UIPageViewController:

extension UIPageViewController {
  var scrollView: UIScrollView? {
    view.subviews.first(where: { $0 is UIScrollView }) as? UIScrollView
  }
}

It's quite easy to set yourself as the delegate for scroll view events, as so:

pageViewController.scrollView?.delegate = self