com.unity.uiwidgets/Samples/UIWidgetsGallery/demo/cupertino/cupertino_activity_indicator_demo.cs

using Unity.UIWidgets.cupertino;
using Unity.UIWidgets.widgets;

namespace UIWidgetsGallery.gallery {
    /*
    class CupertinoProgressIndicatorDemo : StatelessWidget {
        public static string routeName = "/cupertino/progress_indicator";

        public override
            Widget build(BuildContext context) {
            return new CupertinoPageScaffold(
                navigationBar: new CupertinoNavigationBar(
                    previousPageTitle: "Cupertino",
                    middle: new Text("Activity Indicator"),
                    trailing: new CupertinoDemoDocumentationButton(routeName)
                ),
                child: new Center(
                    child: new CupertinoActivityIndicator()
                )
            );
        }
    }
    */
}