ViewPager like ViewController

ViewPagerViewController.cs

using System;
using UIKit;
using System.Collections.Generic;
using Foundation;
using System.Linq;

namespace CustomView
{
    public class ViewPagerViewController<TData> : UIPageViewController, IUIPageViewControllerDelegate, IUIPageViewControllerDataSource
    {
        private readonly Dictionary<int, UIViewController> _viewControllers;
        private IList<TData> _items { get; }
        private readonly Func<TData, UIViewController> _viewControllerFactory;
        private int _lastIndex;
        public int Index { get; private set; }

        public ViewPagerViewController(UIPageViewControllerNavigationOrientation orientation, IList<TData> items, Func<TData, UIViewController> viewControllerFactory) : base(UIPageViewControllerTransitionStyle.Scroll, orientation, UIPageViewControllerSpineLocation.None)
        {
            _items = items;
            _viewControllerFactory = viewControllerFactory;
            _viewControllers = new Dictionary<int, UIViewController>();

            MoveToPage(Index);
            Delegate = this;
            DataSource = this;
            View.TranslatesAutoresizingMaskIntoConstraints = false;
        }

        UIViewController IUIPageViewControllerDataSource.GetNextViewController(UIPageViewController pageViewController, UIViewController referenceViewController)
        {
            var index = Index;
            return index++ < _items.Count - 1 ? GetOrCreateViewController(index) : null;
        }

        UIViewController IUIPageViewControllerDataSource.GetPreviousViewController(UIPageViewController pageViewController, UIViewController referenceViewController)
        {
            var index = Index;
            return index-- > 0 ? GetOrCreateViewController(index) : null;
        }

        private UIViewController GetOrCreateViewController(int index)
        {
            if (!_viewControllers.TryGetValue(index, out UIViewController viewController))
            {
                _viewControllers.Add(index, viewController = _viewControllerFactory(_items[index]));
            }

            return viewController;
        }

        [Export("pageViewController:didFinishAnimating:previousViewControllers:transitionCompleted:")]
        public new void DidFinishAnimating(UIPageViewController pageViewController, bool finished, UIViewController[] previousViewControllers, bool completed)
        {
            if (!completed)
            {
                return;
            }

            var currentViewController = ViewControllers.FirstOrDefault();
            _lastIndex = Index = _viewControllers.FirstOrDefault(x => x.Value == currentViewController).Key;
        }

        public void MoveToPage(int index)
        {
            var viewcontroller = GetOrCreateViewController(index);

            var animateDirection = index > _lastIndex ? UIPageViewControllerNavigationDirection.Forward : UIPageViewControllerNavigationDirection.Reverse;

            SetViewControllers(new UIViewController[] { viewcontroller }, animateDirection, true, (bool finished) =>
            {
                Index = _lastIndex = index;
            });
        }
    }
}