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

MainPageUp.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="DownBlue.png" HorizontalOptions="CenterAndExpand" VerticalOptions="StartAndExpand" >
                <Image.GestureRecognizers>
                    <TapGestureRecognizer Tapped="DownBlue_Tapped"/>
                    <PanGestureRecognizer PanUpdated="DownBlue_Tapped" />
                </Image.GestureRecognizers>
            </Image>
        </StackLayout>

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

</ContentPage>