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

var pageViewController: PageViewController? {
    didSet {
        pageViewController?.dataSource = self
        pageViewController?.delegate = self
        scrollView?.delegate = self
    }
}

lazy var scrollView: UIScrollView? = {
    for subview in pageViewController?.view?.subviews ?? [] {
        if let scrollView = subview as? UIScrollView {
            return scrollView
        }
    }
    return nil
}()

extension BaseFeedViewController: UIScrollViewDelegate {

func scrollViewDidScroll(_ scrollView: UIScrollView) {

    let offset = scrollView.contentOffset.x
    let bounds = scrollView.bounds.width
    let page = CGFloat(self.currentPage)
    let count = CGFloat(viewControllers.count)
    let percentage = (offset - bounds + page * bounds) / (count * bounds - bounds)

    print(abs(percentage))
}
}