Get user swiping direction in UIPageViewController

Question

These two methods viewControllerBeforeViewController and viewControllerAfterViewController of the UIPageViewControllerDataSource don\'

Answer 1

Firstly in your viewControllerForIndex method assign viewcontroller.view.tag = index so that every viewcontroller.view has an assigned value

Have a currentIndex property which is initially assigned to that index of the viewcontroller which you have instantiated inside pageviewcontroller

Now in didFinishAnimating do the following

func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
        if !completed {
            return     // return if animation is not completed
        }
       let pCont = bottomDataContainer?.viewControllers?[0] as? CustomVC   //take 
       out current VC

        if currentIndex < pCont?.view.tag ?? 0 {
            topNavView.goToNextDate()
        }else{
            topNavView.goToPrevDate()
        }
        selectedIndex = pCont?.view.tag ?? 0
    }