ImageDetailPage.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:views="clr-namespace:CustomMediaGallery.Views"
             x:Class="CustomMediaGallery.ImageDetailPage">
    <ContentPage.Content>
        <Grid Padding="20">
			<views:PinchToZoomContainer>
				<views:PinchToZoomContainer.Content>
					<Image x:Name="image" />
				</views:PinchToZoomContainer.Content>
			</views:PinchToZoomContainer>
		</Grid>
    </ContentPage.Content>
</ContentPage>