flutter 强制屏幕坚屏显示

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]).then(
    (value) {
     // intFluroRouter();
      runApp(ProviderScope(child: Myapp()));
    },
  );
}