CircleButton control based on IconButton from Iconize

CircleIconButton.cs

using Plugin.Iconize;

namespace IconizeCustomButton.Controls
{
    public class CircleIconButton : IconButton
    {
    }
}

CircleIconButtonRenderer.cs

using Android.OS;
using IconizeCustomButton.Controls;
using IconizeCustomButton.Droid.Renderers;
using Plugin.Iconize;
using System;
using System.ComponentModel;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;
/*
#if USE_FASTRENDERERS
using ButtonRenderer = Xamarin.Forms.Platform.Android.FastRenderers.ButtonRenderer;
#else
using ButtonRenderer = Xamarin.Forms.Platform.Android.AppCompat.ButtonRenderer;
#endif
*/
[assembly: ExportRenderer(typeof(CircleIconButton), typeof(CircleIconButtonRenderer))]
namespace IconizeCustomButton.Droid.Renderers
{ 

/*
    /// <summary>
    /// Defines the <see cref="IconButtonRenderer" /> renderer.
    /// </summary>
#if USE_FASTRENDERERS
    /// <seealso cref="Xamarin.Forms.Platform.Android.FastRenderers.ButtonRenderer" />
#else
    /// <seealso cref="Xamarin.Forms.Platform.Android.AppCompat.ButtonRenderer" />
#endif
*/
    public class CircleIconButtonRenderer : ButtonRenderer
    {
    
        /*
        public CircleIconButtonRenderer(Context context) : base(context)
        {
            this.SetWillNotDraw(false);
        }
        */
        
        protected override void OnDraw(Android.Graphics.Canvas canvas)
        {
            base.OnDraw(canvas);
        }

        #region Properties

        /// <summary>
        /// Gets the button.
        /// </summary>
        /// <value>
        /// The button.
        /// </value>
        private IconButton Button => Element as IconButton;

        #endregion Properties

        /// <summary>
        /// Called when [attached to window].
        /// </summary>
        protected override void OnAttachedToWindow()
        {
            base.OnAttachedToWindow();
#if USE_FASTRENDERERS
            TextChanged += OnTextChanged;
#else
            Control.TextChanged += OnTextChanged;
#endif
        }

        /// <summary>
        /// Called when [detached from window].
        /// </summary>
        protected override void OnDetachedFromWindow()
        {
#if USE_FASTRENDERERS
            TextChanged -= OnTextChanged;
#else
            Control.TextChanged -= OnTextChanged;
#endif
            base.OnDetachedFromWindow();
        }

        /// <summary>
        /// Raises the <see cref="E:ElementChanged" /> event.
        /// </summary>
        /// <param name="e">The <see cref="ElementChangedEventArgs{Button}" /> instance containing the event data.</param>
        protected override void OnElementChanged(ElementChangedEventArgs<Button> e)
        {
            base.OnElementChanged(e);

            if (Button == null)
                return;

#if USE_FASTRENDERERS
        SetAllCaps(false);
#else
            Control.SetAllCaps(false);
#endif

            if (Build.VERSION.SdkInt >= BuildVersionCodes.Lollipop)
            {
                this.SetBackground(null);
                StateListAnimator = null;
            }

            UpdateText();
        }

        /// <summary>
        /// Called when [element property changed].
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The <see cref="PropertyChangedEventArgs" /> instance containing the event data.</param>
        protected override void OnElementPropertyChanged(Object sender, PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);

            if (Button == null)
                return;

            switch (e.PropertyName)
            {
                case nameof(IconButton.FontSize):
                case nameof(IconButton.TextColor):
                    UpdateText();
                    break;
            }
        }

        /// <summary>
        /// Called when [text changed].
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The <see cref="Android.Text.TextChangedEventArgs" /> instance containing the event data.</param>
        private void OnTextChanged(Object sender, Android.Text.TextChangedEventArgs e)
        {
            UpdateText();
        }

        /// <summary>
        /// Updates the text.
        /// </summary>
        private void UpdateText()
        {
#if USE_FASTRENDERERS
            TextChanged -= OnTextChanged;
#else
            Control.TextChanged -= OnTextChanged;
#endif

            var icon = Plugin.Iconize.Iconize.FindIconForKey(Button.Text);
            if (icon != null)
            {
#if USE_FASTRENDERERS
                Text = $"{icon.Character}";
                Typeface = Iconize.FindModuleOf(icon).ToTypeface(Context);
#else
                Control.Text = $"{icon.Character}";
                Control.Typeface = Plugin.Iconize.Iconize.FindModuleOf(icon).ToTypeface(Context);
#endif
            }

#if USE_FASTRENDERERS
            TextChanged += OnTextChanged;
#else
            Control.TextChanged += OnTextChanged;
#endif
        }
    }
}

MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:IconizeCustomButton"
             xmlns:controls="clr-namespace:IconizeCustomButton.Controls"
             xmlns:iconize="clr-namespace:Plugin.Iconize;assembly=Plugin.Iconize"
             x:Class="IconizeCustomButton.MainPage">
    <StackLayout>
        <StackLayout Orientation="Horizontal">
            <Label Text="Iconize-IconButton" 
                       VerticalOptions="FillAndExpand" HorizontalOptions="Start"
                       HorizontalTextAlignment="Start" VerticalTextAlignment="Center"/>
            <iconize:IconButton HeightRequest="40" WidthRequest="40" 
                                BorderRadius="20"
                               Text="fa-500px" TextColor="Red" FontSize="20" 
                               BackgroundColor="Orange" BorderColor="Red"
                               BorderWidth="2" 
                               VerticalOptions="Start" HorizontalOptions="Center">
            </iconize:IconButton>
        </StackLayout>
        <StackLayout Orientation="Horizontal">
            <Label Text="Custom-CircleIconButton" 
                       VerticalOptions="FillAndExpand" HorizontalOptions="Start"
                       HorizontalTextAlignment="Start" VerticalTextAlignment="Center"/>
            <controls:CircleIconButton HeightRequest="40" WidthRequest="40" 
                                    BorderRadius="20"
                                   Text="fa-500px" TextColor="Red" FontSize="20" 
                                   BackgroundColor="Orange" BorderColor="Red"
                                   BorderWidth="2" 
                                   VerticalOptions="Start" HorizontalOptions="Center">
            </controls:CircleIconButton>
        </StackLayout>        
    </StackLayout>
</ContentPage>