Example of Sliding Panel in Xamarin.Forms applications - http://julianocustodio.com/sliding-panel

MainPageLeft.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:DemoSlidingPanel"
             x:Class="DemoSlidingPanel.MainPage">

    <AbsoluteLayout VerticalOptions="FillAndExpand" x:Name="Page">        
        <StackLayout  AbsoluteLayout.LayoutBounds="0,0,1,1" AbsoluteLayout.LayoutFlags="All" BackgroundColor="White">
                <Image Source="LeftBlue.png" HorizontalOptions="EndAndExpand" VerticalOptions="CenterAndExpand" >
                    <Image.GestureRecognizers>
                        <TapGestureRecognizer Tapped="LeftBlue_Tapped"/>
                        <PanGestureRecognizer PanUpdated="LeftBlue_Tapped" />
                    </Image.GestureRecognizers>
                </Image>
        </StackLayout>        

        <StackLayout x:Name="PageLeft" AbsoluteLayout.LayoutBounds="0,0,1,1" AbsoluteLayout.LayoutFlags="All"
                     Orientation="Vertical" VerticalOptions="FillAndExpand" Spacing="0">
            <StackLayout VerticalOptions="FillAndExpand" BackgroundColor="#006df0">
                <Image Source="LeftWhite.png" HorizontalOptions="EndAndExpand" VerticalOptions="CenterAndExpand" >
                    <Image.GestureRecognizers>
                        <TapGestureRecognizer Tapped="LeftWhite_Tapped"/>
                        <PanGestureRecognizer PanUpdated="LeftWhite_Tapped" />
                    </Image.GestureRecognizers>
                </Image>
            </StackLayout>
        </StackLayout>

    </AbsoluteLayout>
</ContentPage>