@override
  Widget build(BuildContext context) {
    return SafeArea(
      child: Scaffold(
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.start,
            children: <Widget>[
              Row(//jakieś coś ),
              FutureBuilder(
                  future: fetchWniosek(),
                  builder:(context, AsyncSnapshot snapshot) {
                    if (!snapshot.hasData) {
                      return Center(child: CircularProgressIndicator());
                    } else {
                      List<WniosekModel> posts = snapshot.data ?? [];
                      return Expanded(
                          child: ListView.builder(
                              itemCount: posts.length,
                              scrollDirection: Axis.vertical,
                              itemBuilder: (BuildContext context, int index) {
                                return Text(posts[index].kod_uzytkownika);
                              }
                          )
                      );
                    }
                  }
              )
            ],
          ),
        ),
      ),
    );
  }
}