Flutter AppBar 去掉底部阴影

 @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('我的'),
          backgroundColor: Colors.deepOrange,
          elevation: 0, //去掉Appbar底部阴影
        ),
        body: Column(
          children: <Widget>[
            Row(
              children: <Widget>[MineHead()],
            )
          ],
        ));
  }