2种方法判断是否开启暗黑模式 - Flutter

2种方法:

1. 不需要 context ，你可以在initState使用：

   var brightness = SchedulerBinding.instance.window.platformBrightness;
   bool darkModeOn = brightness == Brightness.dark;
   

2. 需要context：

   var brightness = MediaQuery.of(context).platformBrightness;
   bool darkModeOn = brightness == Brightness.dark;