Web Page offline show

Hi,

How can i do webpage show offline mode in Xamarin.forms.webpage

I guess, I have to do render webpage for each platform.But how?

These are my sample code:

` public class WebAppPage : BasePage
{

    private WebAppView MyWebAppView;

    public WebAppPage(string targetUrl)
    {

        NavigationPage.SetHasNavigationBar(this, false);


        var stack = new StackLayout
        {
            Orientation = StackOrientation.Vertical,
            HorizontalOptions = LayoutOptions.FillAndExpand,
            VerticalOptions = LayoutOptions.FillAndExpand,

        };

        if (MyWebAppView == null)
        {
            MyWebAppView = new WebAppView
            {
                VerticalOptions = LayoutOptions.FillAndExpand,
                HorizontalOptions = LayoutOptions.FillAndExpand,
                Source =targetUrl
            };
        }

        stack.Children.Add(MyWebAppView);

        Content = stack;


    }

`

and my web page renderer class for ios is:

`[assembly:ExportRenderer(typeof(WebAppView),typeof(WebAppViewRenderer))]
namespace Sample.Wrapper.iOS
{
public class WebAppViewRenderer:WebViewRenderer
{
public WebAppViewRenderer()
{

        Debug.WriteLine("WebAppViewRenderer()");



    }

    protected override void OnElementChanged(VisualElementChangedEventArgs e)
    {
        base.OnElementChanged(e);

        if (e.OldElement==null)
        {

           var cache = new NSUrlCache { DiskCapacity = 512 * 1024 };


            //this.AllowsInlineMediaPlayback = true;

            //NSData myPage = NSData.FromString (this.); 
            //this.LoadData (myPage, "text/html", "UTF-8", new NSUrl (contentDirectoryPath, true))

        //   this.LoadRequest(new NSUrlRequest(new NSUrl(url.Url)));
            this.ScalesPageToFit = true;
            this.ScrollView.ScrollEnabled = false;
            this.Delegate = new MyCustomWebViewDelegate();
            this.ShouldStartLoad += HandleShouldStartLoad;

        }
    }

    private bool HandleShouldStartLoad(UIWebView webview, NSUrlRequest request, UIWebViewNavigationType navigationtype)
    {

        var scheme = "hybrid";

        if (request.Url.Scheme!=scheme.Replace(":",""))
        {
            return true;
        }



        return false;
    }

}`

Thanks..