theme: ThemeData(
appBarTheme: AppBarTheme(brightness: Brightness.light), // light为黑色 dark为白色
// brightness: Brightness.light, // 不能让所有的页面都改色
),
theme: ThemeData(
appBarTheme: AppBarTheme(brightness: Brightness.light), // light为黑色 dark为白色
// brightness: Brightness.light, // 不能让所有的页面都改色
),