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passerby's questions

Martin Hope
passerby
Asked: 2025-04-25 16:53:02 +0800 CST
  • 6

我正在尝试使用 基于现有亮色主题创建暗色主题lightTheme.copyWith(brightness: Brightness.dark)。但是，该应用似乎忽略了暗色主题的亮度。

我的 main.dart 使用以下代码：

@override
Widget build(BuildContext context) {
  return MaterialApp(
      theme: Themes.lightTheme,
      darkTheme: Themes.darkTheme,
      themeMode: ThemeMode.dark,
      ...
  );
}

其中Themes.lightTheme和Themes.darkTheme定义如下：

class Themes {
  static ThemeData get lightTheme => ThemeData(
        colorSchemeSeed: Colors.green,
      );

  static ThemeData get darkTheme => lightTheme.copyWith(
        brightness: Brightness.dark,
      );
}

调试器显示深色主题包含brightness: Brightness.dark。

但是，当我按如下方式定义黑暗主题时，一切正常copyWith：

class Themes {
  static ThemeData get lightTheme => ThemeData(
        colorSchemeSeed: Colors.green,
      );

  static ThemeData get darkTheme => ThemeData(
        colorSchemeSeed: Colors.green,
        brightness: Brightness.dark,
      );
}

有人能指出我对 Dart/Flutter 知识的盲点并解释一下发生了什么吗？

环境：

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.29.3, on Microsoft Windows [Version 10.0.22631.5262], locale xx-XX)
[✓] Windows Version (11 Home 64-bit, 23H2, 2009)
[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.1)
[✓] Chrome - develop for the web
[✓] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.13.6)
[✓] Android Studio (version 2024.3)
[✓] VS Code (version 1.99.3)
[✓] Connected device (3 available)
[✓] Network resources
flutter