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// Get the current theme
OSAppTheme currentTheme = Application.Current.RequestedTheme;

// Set the current theme.
Application.Current.UserAppTheme = OSAppTheme.Dark;

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<ContentPage>
    <StackLayout Margin="20">
        <Label Text="This text is green in light mode, and red in dark mode."
               TextColor="{AppThemeBinding Light=Green, Dark=Red}" />
        <Image Source="{AppThemeBinding Light=lightlogo.png, Dark=darklogo.png}" />
    </StackLayout>
</ContentPage>

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<Grid touch:TouchEff.PressedBackgroundColor="{StaticResource light_blue}"
      touch:TouchEff.RegularBackgroundColor="{StaticResource white}"
      touch:TouchEff.Command="{Binding OpenThemePickerCommand}">
    ...
</Grid>

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using System.ComponentModel;
using MyProject.iOS.Renderers;
using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

[assembly: ExportRenderer(typeof(Entry), typeof(NumericKeyboardEntryRenderer))]
namespace MyProject.iOS.Renderers
{
	public class NumericKeyboardEntryRenderer : EntryRenderer

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using Android.Content;
using MyProject.Controls;
using MyProject.Droid.Renderers;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;
using WebView = Android.Webkit.WebView;

[assembly: ExportRenderer(typeof(ExtendedWebView), typeof(ExtendedWebViewRenderer))]
namespace MyProject.Droid.Renderers
{

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<yummy:PancakeView Border="{yummy:BorderMarkup Color=Orange, Thickness=10}">
  
  ...
  
</yummy:PancakeView>

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<yummy:PancakeView>
    <yummy:PancakeView.Border>
        <yummy:Border Thickness="10" Color="Orange" />
    </yummy:PancakeView.Border>
    
    ...
    
</yummy:PancakeView>

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public class Border
{
    public int Thickness { get; set; }
    public Color Color { get; set; }
    public DashPattern DashPattern { get; set; }
    public BorderDrawingStyle DrawingStyle { get; set; }
    public Point GradientStartPoint { get; set; }
    public Point GradientEndPoint { get; set; }
    public GradientStopCollection GradientStops { get; set; }
}

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<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:Foodie.Controls"
             xmlns:pagemodels="clr-namespace:Foodie.PageModels"
             x:Class="Foodie.Pages.MainPage">

    <local:AppFrame x:DataType="{x:Type pagemodels:MainPageModel}" Title="Meals">
        <local:AppFrame.Content>
            <Grid Padding="0,16">
              ...

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public partial class AppFrame : Grid
{
    public static readonly BindableProperty TitleProperty = BindableProperty.Create(nameof(Content), typeof(string), typeof(AppFrame), default(string));

    public string Title
    {
        get { return (string)GetValue(TitleProperty); }
        set { SetValue(TitleProperty, value); }
    }