关于flutter:Flutter-AppBar-使用-TabBar且去掉-Title

应用 PreferredSize

class TabBarTestView extends StatelessWidget {  const TabBarTestView({super.key});  @override  Widget build(BuildContext context) {    return DefaultTabController(        initialIndex: 1,        length: 2,        child: Scaffold(          appBar: const PreferredSize(            preferredSize: Size.fromHeight(kToolbarHeight),            child: TabBar(tabs: <Widget>[              Tab(text: "Tab 1"),              Tab(text: "Tab 2"),            ]),          ),          body: TabBarView(            children: [...],          ),        ));  }}