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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace CustomNavigationBarSample
{
    public class CustomNavigationPage : NavigationPage

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public override void OnViewAdded(Android.Views.View child)
{
            base.OnViewAdded(child);
            if (child.GetType() == typeof(Android.Support.V7.Widget.Toolbar))
            {
                var lastPage = Element?.Navigation?.NavigationStack?.Last();

                _toolbar = (Android.Support.V7.Widget.Toolbar)child;
                _originalToolbarBackground = _toolbar.Background;

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protected override void SetupPageTransition(Android.Support.V4.App.FragmentTransaction transaction, bool isPush)
{
            Page lastPage = null;
            
            if (isPush)
            {
                if (Element?.Navigation?.NavigationStack?.Count() >= 2)
                {
                    var previousPage = Element?.Navigation?.NavigationStack[Element.Navigation.NavigationStack.Count() - 2];
                    previousPage.PropertyChanged -= LastPage_PropertyChanged;

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void OnToolbarChildViewAdded(object sender, ChildViewAddedEventArgs e)
{
            var view = e.Child.GetType();
     
            if (e.Child.GetType() == typeof(Android.Widget.TextView))
            {
               
                var textView = (Android.Widget.TextView)e.Child;
                textView.Visibility = ViewStates.Gone;
                _originalDrawable = textView.Background;

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void UpdateFormattedTitleText(Android.Widget.TextView titleTextView, FormattedString formattedString, string defaulTitle)
{
            if (formattedString != null && formattedString.Spans.Count > 0)
            {
                titleTextView.TextFormatted = formattedString.ToAttributed(Font.Default, Xamarin.Forms.Color.Default, titleTextView);
            }
            else
            {
                //Update if not formatted text then update with normal title text
                UpdateTitleText(titleTextView, defaulTitle);

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 public override void ViewDidLoad()
{
            base.ViewDidLoad();
            containerView = new UIView()
            {
                AutoresizingMask = UIViewAutoresizing.FlexibleHeight | UIViewAutoresizing.FlexibleWidth
            };
            
            titleView = new UIView()
            {

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public override void ViewWillAppear(bool animated)
{
   base.ViewWillAppear(animated);
           
   SetupNavBar(NavigationController.NavigationBar.Bounds.Size);
   SetTitlePosition(CustomNavigationPage.GetTitlePosition(Element), CustomNavigationPage.GetTitlePadding(Element), CustomNavigationPage.GetTitleMargin(Element), new CGRect(0, 0, Math.Max(subtitleLabel.IntrinsicContentSize.Width, titleLabel.IntrinsicContentSize.Width), (titleLabel.IntrinsicContentSize.Height + subtitleLabel.IntrinsicContentSize.Height + (subtitleLabel.IntrinsicContentSize.Height > 0.0f ? 3.0f : 0.0f))));
            
   System.Diagnostics.Debug.WriteLine("Preparing");
}

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 void SetupNavBar(CGSize size)
{
            if (NavigationController != null && titleView != null)
            {
                var page = Element as Page;
                containerView.Frame = new CGRect(0, 0, size.Width, size.Height);

                titleView.Layer.BorderWidth = CustomNavigationPage.GetTitleBorderWidth(Element);

                titleView.Layer.CornerRadius = CustomNavigationPage.GetTitleBorderCornerRadius(Element);

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UIImage CreateGradientBackground(Color startColor, Color endColor, CustomNavigationPage.GradientDirection direction)
{
            var gradientLayer = new CAGradientLayer();
            gradientLayer.Bounds = NavigationController.NavigationBar.Bounds;
            gradientLayer.Colors = new CGColor[] { startColor.ToCGColor(), endColor.ToCGColor() };

            switch(direction)
            {
                case CustomNavigationPage.GradientDirection.LeftToRight:
                    gradientLayer.StartPoint = new CGPoint(0.0, 0.5);

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using System;
using System.Collections.Generic;
using System.Linq;
using SegmentedControlSample.Controls;
using Xamarin.Forms;

namespace SegmentedControlSample
{
    public class SegmentedBarControl: ScrollViewWithNotBar
    {