Yii 主题化

主题化可以帮助您在不修改原来的视图文件的情况下替换一组视图。您需要将视图应用组件的 theme 属性设置为使用主题化。

您还应该定义以下属性：

• yii\base\Theme::$basePath - 定义CSS、JS、图片等资源的基础目录。

• yii\base\Theme::$baseUrl - 定义主题化资源的基础URL。

• yii\base\Theme::$pathMap - 定义替换规则。

例如，如果您在UserController中调用 $this->render(‘create’) ，将渲染 @app/views/user/create.php 视图文件。然而，如果您像下面的应用配置一样启用了主题化，将会渲染 @app/themes/basic/user/create.php 视图文件。

步骤1 - 修改 config/web.php 文件的方式如下。

<?php
   params = require(__DIR__ . '/params.php');config = [
      'id' => 'basic',
      'basePath' => dirname(__DIR__),
      'bootstrap' => ['log'],
      'components' => [
         'request' => [
            // !!! insert a secret key in the following (if it is empty) - this
               //is required by cookie validation
            'cookieValidationKey' => 'ymoaYrebZHa8gURuolioHGlK8fLXCKjO',
         ],
         'cache' => [
            'class' => 'yii\caching\FileCache',
         ],
         'user' => [
            'identityClass' => 'app\models\User',
            'enableAutoLogin' => true,
         ],
         'errorHandler' => [
            'errorAction' => 'site/error',
         ],
         'mailer' => [
            'class' => 'yii\swiftmailer\Mailer',
            // send all mails to a file by default. You have to set
            // 'useFileTransport' to false and configure a transport
            // for the mailer to send real emails.
            'useFileTransport' => true,
         ],
         'log' => [
            'traceLevel' => YII_DEBUG ? 3 : 0,
            'targets' => [
               [
                  'class' => 'yii\log\FileTarget',
                  'levels' => ['error', 'warning'],
               ],
            ],
         ],
         'view' => [
            'theme' => [
               'basePath' => '@app/themes/basic',
               'baseUrl' => '@web/themes/basic',
               'pathMap' => [
                  '@app/views' => '@app/themes/basic',
               ],
            ],
         ],
         'db' => require(__DIR__ . '/db.php'),
      ],
      'modules' => [
         'hello' => [
            'class' => 'app\modules\hello\Hello',
         ],
      ],
      'params' => params,
   ];
   if (YII_ENV_DEV) {
      // configuration adjustments for 'dev' environmentconfig['bootstrap'][] = 'debug';
      config['modules']['debug'] = [
         'class' => 'yii\debug\Module',
      ];config['bootstrap'][] = 'gii';
      config['modules']['gii'] = [
         'class' => 'yii\gii\Module',
      ];
   }
   returnconfig;
?>

我们已经添加了视图应用组件。

步骤2 − 现在创建 web/themes/basic 目录结构和 themes/basic/site 。在themes/basic/site文件夹内创建一个名为 about.php 的文件，并添加以下代码。

<?php
   /* @var this yii\web\View */
   use yii\helpers\Html;this->title = 'About';
   this->params['breadcrumbs'][] =this->title;
   this->registerMetaTag(['name' => 'keywords', 'content' => 'yii, developing,
      views, meta, tags']);this->registerMetaTag(['name' => 'description', 'content' => 'This is the
      description of this page!'], 'description');
?>

<div class = "site-about">
   <h1><?= Html::encode($this->title) ?></h1>

   <p style = "color: red;">
      This is the About page. You may modify the following file to customize its content:
   </p> 
</div>

步骤3 − 现在，转到 http://localhost:8080/index.php?r=site/about ，将会呈现 themes/basic/site/about.php 文件，而不是 views/site/about.php 。

步骤4 − 针对主题模块，按照以下方式配置 yii\base\Theme::$pathMap 属性。

'pathMap' => [
   '@app/views' => '@app/themes/basic',
   '@app/modules' => '@app/themes/basic/modules',
],

步骤5 - 要为小部件设置主题，请按以下方式配置 yii\base\Theme::$pathMap 属性。

'pathMap' => [
   '@app/views' => '@app/themes/basic',
   '@app/widgets' => '@app/themes/basic/widgets', // <-- !!!
],

有时您需要指定一个包含应用程序的基本外观的基本主题。为了实现这个目标，您可以使用主题继承。

步骤6 - 以以下方式修改视图应用程序组件。

'view' => [
   'theme' => [
      'basePath' => '@app/themes/basic',
      'baseUrl' => '@web/themes/basic',
      'pathMap' => [
         '@app/views' => [
            '@app/themes/christmas',
            '@app/themes/basic',
         ],
      ]
   ],
],

在上述配置中， @app/views/site/index.php 视图文件将会被主题化为 @app/themes/christmas/site/index.php 或 @app/themes/basic/site/index.php，取决于哪个文件存在。如果两个文件都存在，则使用第一个。

步骤7 - 创建目录结构 themes/christmas/site 。

步骤8 - 现在，在 themes/christmas/site 文件夹中，创建一个名为 about.php 的文件，其中包含以下代码。

<?php
   /* @var this yii\web\View */
   use yii\helpers\Html;this->title = 'About';
   this->params['breadcrumbs'][] =this->title;
   this->registerMetaTag(['name' => 'keywords', 'content' => 'yii, developing,
      views, meta, tags']);this->registerMetaTag(['name' => 'description', 'content' => 'This is the
      description of this page!'], 'description');
?>

<div class = "site-about">
   <h2>Christmas theme</h2>
   <img src = "http://pngimg.com/upload/fir_tree_PNG2514.png" alt = ""/>
   <p style = "color: red;">
      This is the About page. You may modify the following file to customize its content:
   </p>
</div>

步骤9 − 如果你访问 http://localhost:8080/index.php?r=site/about ，你将会看到使用圣诞主题的更新的关于页面。