@override
Widget build(BuildContext context) {
  return SafeArea(
    child: WillPopScope(
      onWillPop: _onBack,
      child: Scaffold(
          body: yuklendimi == false ? loadingContent() : kriptoBodyContent()),
    ),
  );
}

Center loadingContent() => Center(child: CircularProgressIndicator());

Widget kriptoBodyContent() {
  return StickyHeader(
    header: Text("BAŞLIK"),

   content: GridContent(),);
}

Widget GridContent() {
  return Padding(
    padding:
    EdgeInsets.only(top: 0, bottom: 30, left: 10, right: 10),
    child: Container(
        child: GridView.builder(
          itemCount: kriptoModel.length,
          gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
            crossAxisCount: 1,
            mainAxisExtent: 65,
          ),
          itemBuilder: (BuildContext contex, int index) {
            KriptoResModel model = kriptoModel[index];
            print(model.id);
            return Padding(
              padding: EdgeInsets.only(top: 5),
              child: Material(
                //elevation: 10,
                elevation: 3,
                shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.all(
                      Radius.circular(10.0),
                    )),
                child: InkWell(
                  onTap: () {},
                  child: Padding(
                    padding: EdgeInsets.all(2),
                    child: Container(
                      child: getColumnItem(model),
                    ),
                  ),
                ),
              ),
            );
          },
        )));
}