Flutter 字体大小不跟随系统

 @override
  Widget build(BuildContext context) {
    return MaterialApp(
      localizationsDelegates: [
        CupertinoLocalizationsDelegate(),
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
      ],
      supportedLocales: [
        const Locale('zh', 'CN'),
      ],
      navigatorKey: App.navigatorKey,
      debugShowCheckedModeBanner: false,
      title: CommConf.app_name,
      routes: <String, WidgetBuilder>{
        "/tab_navigator": (context) => TabNavigator(),
        "/loginPage": (context) => LoginPage().buildPage(null),
        "/balanceListPage": (context) => BalanceListPage()
      },
      theme: ThemeData(
        /// 修改光标指引颜色
        textSelectionHandleColor: Colors.transparent,
        backgroundColor: Colors.white,

        /// 通用背景色
        scaffoldBackgroundColor: Colors.white,
        primaryColor: Colors.white,
        primaryColorBrightness: Brightness.light,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home:
          ifLogin ? TabNavigator() : this.routes.buildPage("/login_page", null),
      builder: (context, widget) {
        return MediaQuery(
          //设置文字大小不随系统设置改变
          data: MediaQuery.of(context).copyWith(textScaleFactor: 1.0),
          child: widget,
        );
      },
      // home: this.routes.buildPage("/login_page", null),
      onGenerateRoute: (RouteSettings settings) {
        return MaterialPageRoute<Object>(builder: (BuildContext context) {
          return routes.buildPage(settings.name, settings.arguments);
        });
      },
    );
  }