I refactor this project based on TEditor(https://github.com/XAM-Consulting/TEditor), removed UIWebView, and using WKWebView instead. Refactor project to netstandard lib. TEditor is a HTML editor for Xamarin, it has so many build-in features and easy to use.

Available on Nuget:https://www.nuget.org/packages/TEditor2/

Call single line from any project or PCL, make sure it must be in UIThread.

        TEditorResponse response = await CrossTEditor.Current.ShowTEditor("<p>XAM consulting</p>");
        if (!string.IsNullOrEmpty(response.HTML))
            _displayWebView.Source = new HtmlWebViewSource() { Html = response.HTML };

If user click save it will return html as string. If user click cancel, it return empty string.

TEditor allow user to custom toolbar, you can add features when you need it, like

     var toolbar = new ToolbarBuilder().AddBasic().AddH1();
     TEditorResponse response = await CrossTEditor.Current.ShowTEditor("<p>XAM consulting</p>", toolbar);

Also, you can add a new ToolbarItem with new icon like

    var toolbar = new ToolbarBuilder().AddBasic().AddH1("H1Icon.png");

TEditor2

ZSSRichTextEditor

PopColorPicker

MonoDroid.ColorPickers