您可以执行类似的操作(随意更改):

You can do something similar to this (Feel free to change things as you'd like):

首先转到ios/Runner文件夹.接下来打开info.plist并将以下几行添加到Dict部分.

At first go to ios/Runner folder. Next open info.plist and add the following lines into the Dict section.

<key>UIUserInterfaceStyle</key>
<string>Light</string>
<key>UIViewControllerBasedStatusBarAppearance</key>
<true/>

下一步.确保您在MaterialApp的主题设置中包含以下行:

Next. Make sure you have these lines in Theme settings of your MaterialApp:

MaterialApp(
    themeMode: ThemeMode.light, // Change it as you want
    theme: ThemeData(
        primaryColor: Colors.white,
        primaryColorBrightness: Brightness.light,
        brightness: Brightness.light,
        primaryColorDark: Colors.black,
        canvasColor: Colors.white,
        // next line is important!
        appBarTheme: AppBarTheme(brightness: Brightness.light)),
    darkTheme: ThemeData(
        primaryColor: Colors.black,
        primaryColorBrightness: Brightness.dark,
        primaryColorLight: Colors.black,
        brightness: Brightness.dark,
        primaryColorDark: Colors.black,      
        indicatorColor: Colors.white,
        canvasColor: Colors.black,
        // next line is important!
        appBarTheme: AppBarTheme(brightness: Brightness.dark)),