YII框架的主题是什么？YII框架如何切换主题？

config/web.php

config/main.php

components

yii\base\Theme

@app/themes/basic

'components' => [
    'view' => [
        'theme' => [
            'basePath' => '@app/themes/basic', // 主题文件的物理路径
            'baseUrl' => '@web/themes/basic',   // 主题资源的Web可访问URL
        ],
    ],
    // ... 其他组件配置
],

basic

adminlte

.php

site/index.php

user/profile.php

layouts

main.php

$content

assets

css/site.css

js/script.js

images/logo.png

AssetBundle.php

themes/
├── basic/
│   ├── views/
│   │   ├── site/
│   │   │   └── index.php
│   │   ├── layouts/
│   │   │   └── main.php
│   │   └── user/
│   │       └── profile.php
│   └── web/
│       ├── css/
│       │   └── style.css
│       ├── js/
│       │   └── script.js
│       └── images/
│           └── logo.png
│   └── BasicAsset.php  (如果主题有自己的AssetBundle)
└── another_theme/
    └── ...

themes/your_theme/web/

sourcePath

// themes/basic/BasicAsset.php
namespace app\themes\basic;

use yii\web\AssetBundle;

class BasicAsset extends AssetBundle
{
    public $sourcePath = '@app/themes/basic/web';
    public $css = [
        'css/style.css',
    ];
    public $js = [
        'js/script.js',
    ];
    public $depends = [
        'yii\web\YiiAsset',
        'yii\bootstrap\BootstrapAsset', // 假设你还在用Bootstrap
    ];
}

themes/basic/views/layouts/main.php

<?php
use app\themes\basic\BasicAsset;
BasicAsset::register($this);
?>

runtime/cache

@web

init()

beforeAction()

?theme=dark

// 在你的某个控制器中，比如 SiteController.php
namespace app\controllers;

use Yii;
use yii\web\Controller;
use yii\base\Theme;

class SiteController extends Controller
{
    public function init()
    {
        parent::init();

        $requestedTheme = Yii::$app->request->get('theme');

        if ($requestedTheme === 'dark') {
            Yii::$app->view->theme = new Theme([
                'basePath' => '@app/themes/dark',
                'baseUrl' => '@web/themes/dark',
            ]);
        } elseif ($requestedTheme === 'light') {
            Yii::$app->view->theme = new Theme([
                'basePath' => '@app/themes/light',
                'baseUrl' => '@web/themes/light',
            ]);
        }
        // 也可以从用户会话、数据库配置中读取主题设置
        // $userTheme = Yii::$app->user->identity->theme_preference ?? 'default';
        // if ($userTheme !== 'default') { ... }
    }

    public function actionIndex()
    {
        return $this->render('index');
    }

    // ... 其他动作
}

frontend/config/main.php

as behaviors

web.php

// config/web.php
'as themeSelector' => [
    'class' => 'app\behaviors\ThemeSelectorBehavior', // 假设你创建了这个行为
    // 'themeMap' => [...] // 可以在这里定义主题映射
],

Yii::$app->view->theme