PageViewController current page index in Swift

Question

I want to get current index of a pageViewController, I don\'t know how I get the visible pages index.

func pageViewController(pageViewController: UIPageViewContr         


        

Answer 1

First, have your UIPageViewController implement the UIPageViewControllerDataSource method presentationIndex(for pageViewController: UIPageViewController) -> Int to return the index for each of the PageViewController's ViewControllers.

Then in your delegate, access the datasource through the passed-in PageViewController:

func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
    guard let dataSource = pageViewController.dataSource, 
          let currentIndex = dataSource.presentationIndex?(for: pageViewController) else { preconditionFailure() }

}