simple_dart_theme_controller 是一个用于管理 Flutter 应用主题的简单插件。它允许你在应用中轻松切换和管理主题，支持亮色和暗色主题的切换。以下是如何使用 simple_dart_theme_controller 插件的步骤：

1. 添加依赖

首先，你需要在 pubspec.yaml 文件中添加 simple_dart_theme_controller 插件的依赖：

dependencies:
  flutter:
    sdk: flutter
  simple_dart_theme_controller: ^1.0.0  # 请使用最新版本

然后运行 flutter pub get 来安装依赖。

2. 初始化主题控制器

在你的应用的入口文件（通常是 main.dart）中，初始化 ThemeController：

import 'package:flutter/material.dart';
import 'package:simple_dart_theme_controller/simple_dart_theme_controller.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  final ThemeController _themeController = ThemeController();

  @override
  Widget build(BuildContext context) {
    return ThemeControllerProvider(
      controller: _themeController,
      child: MaterialApp(
        title: 'Flutter Theme Demo',
        theme: _themeController.lightTheme,
        darkTheme: _themeController.darkTheme,
        themeMode: _themeController.themeMode,
        home: MyHomePage(),
      ),
    );
  }
}

3. 定义主题

你可以在 ThemeController 中定义亮色和暗色主题。例如：

class ThemeController {
  final ThemeData lightTheme = ThemeData(
    primarySwatch: Colors.blue,
    brightness: Brightness.light,
  );

  final ThemeData darkTheme = ThemeData(
    primarySwatch: Colors.blue,
    brightness: Brightness.dark,
  );

  ThemeMode _themeMode = ThemeMode.system;

  ThemeMode get themeMode => _themeMode;

  void setThemeMode(ThemeMode mode) {
    _themeMode = mode;
    // 通知监听器主题已更改
    // 你可以使用 Provider 或 ChangeNotifier 来通知 UI 更新
  }
}

4. 切换主题

你可以在应用的任何地方通过 ThemeController 来切换主题。例如，在一个按钮的点击事件中切换主题：

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final themeController = ThemeControllerProvider.of(context);

    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Theme Demo'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'Current Theme: ${themeController.themeMode == ThemeMode.light ? 'Light' : 'Dark'}',
            ),
            ElevatedButton(
              onPressed: () {
                themeController.setThemeMode(
                  themeController.themeMode == ThemeMode.light
                      ? ThemeMode.dark
                      : ThemeMode.light,
                );
              },
              child: Text('Toggle Theme'),
            ),
          ],
        ),
      ),
    );
  }
}

5. 使用 ThemeControllerProvider

为了在应用的任何地方访问 ThemeController，你可以使用 ThemeControllerProvider。在上面的代码中，我们已经将 ThemeController 提供给了整个应用。

6. 监听主题变化

如果你需要在主题变化时执行某些操作，可以使用 ChangeNotifier 或 Provider 来监听主题的变化。例如：

class ThemeController with ChangeNotifier {
  ThemeData _lightTheme = ThemeData(
    primarySwatch: Colors.blue,
    brightness: Brightness.light,
  );

  ThemeData _darkTheme = ThemeData(
    primarySwatch: Colors.blue,
    brightness: Brightness.dark,
  );

  ThemeMode _themeMode = ThemeMode.system;

  ThemeData get lightTheme => _lightTheme;
  ThemeData get darkTheme => _darkTheme;
  ThemeMode get themeMode => _themeMode;

  void setThemeMode(ThemeMode mode) {
    _themeMode = mode;
    notifyListeners(); // 通知监听器主题已更改
  }
}

然后在 UI 中使用 ChangeNotifierProvider 来监听主题变化：

void main() {
  runApp(
    ChangeNotifierProvider(
      create: (_) => ThemeController(),
      child: MyApp(),
    ),
  );
}