flutter项目关闭暗黑模式

写了个flutter项目，小米手机夜晚会自动进入暗黑模式，自己的app没有适配暗黑模式，导致显示和UI设计出入很大，想关闭app的暗黑模式，摸索了很久，后来发现原来设置个 brightness 属性为 Brightness.light 就行了！踩个坑，记录一下，希望能帮助遇到问题的其他人
我的完整代码

CupertinoApp(
           localizationsDelegates: [
             CupertinoLocalizationsDelegate(),
             GlobalMaterialLocalizations.delegate, 
             GlobalWidgetsLocalizations.delegate,
           ],
           supportedLocales: [
             const Locale('zh', 'CH'),
             const Locale('en', 'US')
           ],
           debugShowCheckedModeBanner: true,
           navigatorObservers: [navObserver],
           theme: CupertinoThemeData(
             scaffoldBackgroundColor: Colors.white,
             brightness: Brightness.light,
             textTheme: CupertinoTextThemeData(textStyle:TextStyle(fontFamily: 'PingFang SC',color: Colors.black)),
           ),
           home: AppIndexPage(),
           routes: routerConfigMap(),
         )