我的库比蒂诺应用程序包括一个材料设计风格的小部件（导航轨道）。我想所有的小部件使用相同的主题。
我的一些代码：

@override
Widget build(BuildContext context) {
  final Brightness platformBrightness = WidgetsBinding.instance.window.platformBrightness;
  return Theme(
    data: ThemeData(
      brightness: platformBrightness,
    ),
    child: CupertinoApp(
      onGenerateTitle: (context) => S.of(context).AppName,
      localizationsDelegates: const [
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
        GlobalCupertinoLocalizations.delegate,
        S.delegate
      ],
      supportedLocales: S.delegate.supportedLocales,
      theme: CupertinoThemeData(
        brightness: platformBrightness,
      ),
      home: const Scaffold(
        resizeToAvoidBottomInset: false,
        body: SafeArea(
          bottom: false,
          child: HomePage(),
        ),
      ),
    ),
  );
}

主页返回

return Row(
  children: <Widget>[
    SingleChildScrollView(
      controller: ScrollController(),
      scrollDirection: Axis.vertical,
      child: IntrinsicHeight(
        child: AppRightSideControls(_controller.future),
      ),
    ),
    const VerticalDivider(thickness: 1, width: 1),
    // This is the main content.
    Expanded(
      ...
    ),
  ],
);

class AppRightSideControls extends StatelessWidget {
  ...

  @override
  Widget build(BuildContext context) {
    return FutureBuilder(
      future: _webViewControllerFuture,
      builder:
          (BuildContext context, AsyncSnapshot<WebViewController> snapshot) {
        ...
        return NavigationRail(
          labelType: NavigationRailLabelType.all,
          ...
        );
      },
    );
  }
}

我试着把CupertinoApp作为主题的子项。让ThemeData和CupertinoThemeData使用相同的亮度。但是我得到了黑色和白色两种颜色。
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