C# version of https://github.com/aubrey/SwiftPagingNav

PagingNavController.cs

using System;
using System.Collections.Generic;
using System.Linq;

using Foundation;
using UIKit;

namespace pagingnav
{
	// The UIApplicationDelegate for the application. This class is responsible for launching the
	// User Interface of the application, as well as listening (and optionally responding) to
	// application events from iOS.

	public class PagingNavController : UIViewController {
		UIScrollView scrollView;
		UIPageControl pageControl;
		UIView navbarView;

		UILabel navTitleLabel1;
		UILabel navTitleLabel2;
		UILabel navTitleLabel3;

		UIView view1;
		UIView view2;
		UIView view3;

		public override void ViewDidLoad ()
		{
			base.ViewDidLoad ();

			View.BackgroundColor = UIColor.LightGray;

			var wBounds = View.Bounds.Width;
			var hBounds = View.Bounds.Height;

			scrollView = new UIScrollView ();
			scrollView.BackgroundColor = UIColor.Clear;
			scrollView.Frame = View.Frame;
			scrollView.PagingEnabled = true;
			scrollView.ShowsHorizontalScrollIndicator = false;
			scrollView.Bounces = false;

			View.AddSubview (scrollView);

			scrollView.ContentSize = new CoreGraphics.CGSize (View.Bounds.Size.Width * 3, hBounds / 2); //3 pages?

			//Putting a subview in the navigationbar to hold the titles and page dots
			navbarView = new UIView ();

			if (NavigationController != null){
				NavigationController.NavigationBar.AddSubview (navbarView);
			}

			//Paging control is added to a subview in the uinavigationcontroller
			pageControl = new UIPageControl();
			pageControl.Frame = new CoreGraphics.CGRect (0, 35, 0, 0);
			pageControl.BackgroundColor = UIColor.White;
			pageControl.Pages = 3;
			pageControl.CurrentPage = 0;
			pageControl.CurrentPageIndicatorTintColor = UIColor.FromRGBA (0.325f, 0.667f, 0.922f, 1f);
			pageControl.PageIndicatorTintColor = UIColor.White;

			navbarView.AddSubview (pageControl);

			//Titles for the nav controller (also added to a subview in the uinavigationcontroller)
			//Setting size for the titles. FYI changing width will break the paging fades/movement
			var titleSize = new CoreGraphics.CGRect (x: 0, y: 8, width: wBounds, height: 20);

			navTitleLabel1 = new UILabel { Frame = titleSize, Text = "Home", TextAlignment = UITextAlignment.Center };
			navTitleLabel2 = new UILabel { Frame = titleSize, Text = "Discover", TextAlignment = UITextAlignment.Center };
			navTitleLabel3 = new UILabel { Frame = titleSize, Text = "Activity", TextAlignment = UITextAlignment.Center };

			navbarView.AddSubview (navTitleLabel1);
			navbarView.AddSubview (navTitleLabel2);
			navbarView.AddSubview (navTitleLabel3);

			view1 = new UIView { BackgroundColor = UIColor.Blue, Frame = new CoreGraphics.CGRect (0, 0, wBounds, hBounds) };
			scrollView.AddSubview (view1);
			scrollView.BringSubviewToFront (view1);

			view2 = new UIView { BackgroundColor = UIColor.Green, Frame = new CoreGraphics.CGRect (wBounds, 0, wBounds, hBounds) };
			scrollView.AddSubview (view2);
			scrollView.BringSubviewToFront (view2);

			view3 = new UIView { BackgroundColor = UIColor.Purple, Frame = new CoreGraphics.CGRect (wBounds * 2, 0, wBounds, hBounds) };
			scrollView.AddSubview (view3);
			scrollView.BringSubviewToFront (view3);

			scrollView.ScrollAnimationEnded += HandleScrollAnimationEnded;
			scrollView.Scrolled += HandleScrolled;
			scrollView.DecelerationEnded += (sender, e) => {

				var xOffset = scrollView.ContentOffset.X;

				//Change the pageControl dots depending on the page / offset values
				if (xOffset < 1.0) {
					pageControl.CurrentPage = 0;
				} else if (xOffset < View.Bounds.Width + 1) {
					pageControl.CurrentPage = 1;
				} else {
					pageControl.CurrentPage = 2;
				}

				Console.WriteLine ("decelerated on page " + pageControl.CurrentPage);
			};
		}

		void HandleScrolled (object sender, EventArgs e)
		{
			var xOffset = scrollView.ContentOffset.X;

			var wBounds = View.Bounds.Width;
			var hBounds = View.Bounds.Height;
			var widthOffset = wBounds / 100;
			var offsetPosition = 0 - xOffset / widthOffset;

			//Apply the positioning values created above to the frame's position based on user's scroll

			navTitleLabel1.Frame = new CoreGraphics.CGRect (offsetPosition, 8, wBounds, 20);
			navTitleLabel2.Frame = new CoreGraphics.CGRect (offsetPosition + 100, 8, wBounds, 20);
			navTitleLabel3.Frame = new CoreGraphics.CGRect (offsetPosition + 200, 8, wBounds, 20);

			//Change the alpha values of the titles as they are scrolled
			navTitleLabel1.Alpha = 1 - xOffset / wBounds;

			if (xOffset <= wBounds) {
				navTitleLabel2.Alpha = xOffset / wBounds;
			} else {
				navTitleLabel2.Alpha = 1 - (xOffset - wBounds) / wBounds;
			}
			navTitleLabel3.Alpha = (xOffset - wBounds) / wBounds;

			Console.WriteLine ("Scrollin'");
		}

		void HandleScrollAnimationEnded (object sender, EventArgs e)
		{
			Console.WriteLine ("Done scrollin");
		}

		public override void ViewDidLayoutSubviews ()
		{
			base.ViewDidLayoutSubviews ();

			navbarView.Frame = new CoreGraphics.CGRect (0, 0, View.Bounds.Width, 44);
		}
	}
}