请问 flutter 如何去掉 appBar Title 部分高度?

Question

请问图中红色框子里的这一栏怎么去掉呢？

class HomeScreenState extends State<HomeScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        brightness: Brightness.light,
      ),
      body: SearchBar(),
      backgroundColor: Colors.orange,
    );
  }
}

Answer 1

        appBar: PreferredSize(
            child: AppBar(
            ),
            preferredSize: Size.fromHeight(0)),

Answer 2

appBar传入null
或者用搜索栏
flutter搜索栏代码参考