Prism NavigationPage

PrismNavigationPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<NavigationPage xmlns="http://xamarin.com/schemas/2014/forms"
                xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                BackgroundColor="{Binding BackgroundColor}"
                BarBackgroundColor="{Binding BarBackgroundColor}"
                BarTextColor="{Binding BarTextColor}"
                Title="{Binding Title}"                
                x:Class="MyProject.Views.PrismNavigationPage">

</NavigationPage>

PrismNavigationPage.xaml.cs

using Prism.Navigation;
using Xamarin.Forms;

namespace MyProject.Views
{
    public partial class PrismNavigationPage : NavigationPage
    {
        Page _lastPage;

        public PrismNavigationPage()
        {
            InitializeComponent();

            this.Popped += OnPoppedHandler;
            this.Pushed += OnPushedHandler;
        }

        void OnPoppedHandler( object sender, NavigationEventArgs e )
        {
            var parameters = new NavigationParameters();

            if( _lastPage != null )
            {
                HandleINavigationAware( _lastPage as INavigationAware, parameters, true );
                HandleINavigationAware( _lastPage.BindingContext as INavigationAware, parameters, true );
            }

            HandleINavigationAware( CurrentPage as INavigationAware, parameters, false );
            HandleINavigationAware( CurrentPage.BindingContext as INavigationAware, parameters, false );

            _lastPage = CurrentPage;
        }

        void OnPushedHandler( object sender, NavigationEventArgs e )
        {
            _lastPage = CurrentPage;
        }

        void HandleINavigationAware( INavigationAware aware, NavigationParameters parameters, bool ExecuteFrom )
        {
            if (aware == null) return;

            if( ExecuteFrom ){
                aware.OnNavigatedFrom(parameters);
            }
            else{
                aware.OnNavigatedTo(parameters);
            }
        }
    }
}

PrismNavigationPageViewModel.cs

using Prism.Navigation;
using Xamarin.Forms;

namespace MyProject.ViewModels
{
    public class PrismNavigationPageViewModel : BindableBase, INavigationAware
    {
        private Color _backgroundColor = Color.White;
        public Color BackgroundColor
        {
            get { return _backgroundColor; }
            set { SetProperty( ref _backgroundColor, value ); }
        }

        private Color _barBackgroundColor = Color.Black;
        public Color BarBackgroundColor
        {
            get { return _barBackgroundColor; }
            set { SetProperty( ref _barBackgroundColor, value ); }
        }

        private Color _barTextColor = Color.White;
        public Color BarTextColor
        {
            get { return _barTextColor; }
            set { SetProperty( ref _barTextColor, value ); }
        }

        private string _title;
        public string Title
        {
            get { return _title; }
            set { SetProperty( ref _title, value ); }
        }

        public void OnNavigatedFrom( NavigationParameters parameters )
        {

        }

        public void OnNavigatedTo( NavigationParameters parameters )
        {
            if( parameters.ContainsKey( "title" ) )
                Title = ( string )parameters[ "title" ];

            if( parameters.ContainsKey( "backgroundColor" ) )
                BackgroundColor = GetColor( parameters[ "backgroundColor" ] );

            if( parameters.ContainsKey( "barBackgroundColor" ) )
                BarBackgroundColor = GetColor( parameters[ "barBackgroundColor" ] );

            if( parameters.ContainsKey( "barTextColor" ) )
                BarTextColor = GetColor( parameters[ "barTextColor" ] );
        }

        private Color GetColor( object colorParam )
        {
            var converter = new ColorTypeConverter();
            return (Color)converter.ConvertFromInvariantString( colorParam.ToString() );
        }
    }
}