希望这对你有帮助

void main() {
  SystemChrome.setSystemUIOverlayStyle(
    const SystemUiOverlayStyle(
      statusBarColor: Colors.red,
    ),
  );
  runApp(MyApp());
}

这个工作对我来说

@override 
Widget build(BuildContext context) {
return Scaffold(
  body: AnnotatedRegion<SystemUiOverlayStyle>(
    value: SystemUiOverlayStyle.light,
    child: BodyWidget(),
  ),
);
}

另一种有效的方法是：

class MyWidget extends StatelessWidget {
  const MyWidget({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return AnnotatedRegion<SystemUiOverlayStyle>(
      value: SystemUiOverlayStyle(
        statusBarColor: Colors.red,
        systemNavigationBarColor: Colors.red,
        statusBarIconBrightness: Brightness.dark,
        systemNavigationBarIconBrightness: Brightness.dark,
      ),
      child: Scaffold(),
    );
  }
}