怎樣的Yii2更換@應用程序/視圖/佈局/用@應用程序/主題/基本/佈局/ main.php main.php，當我使用視圖組件

Question

如果我使用視圖組件，如文件說

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

這是否意味着@ app/themes/basic/layouts/main.php文件夾中的main.php會替換文件夾@app/views/layouts/main.php中的main.php？

以及yii2如何實現這一目標？我無法弄清楚，儘管我追蹤了控制器，發現了一些可以幫助我理解邏輯的東西。

我追蹤了下面的代碼，但是我沒有發現在使用主題時佈局main.php是如何被替換的。

1.SiteController，默認操作指數，然後渲染視圖

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

2.call Controller類功能使

public function render($view, $params = []) 
{ 
    $content = $this->getView()->render($view, $params, $this); 
    return $this->renderContent($content); 
} 

3.get的警予\網絡\查看

public function getView() 
{ 
    if ($this->_view === null) { 
     $this->_view = Yii::$app->getView(); 
    } 
    return $this->_view; 
} 

4.使用View類功能渲染

public function render($view, $params = [], $context = null) 
{ 
    $viewFile = $this->findViewFile($view, $context); 
    return $this->renderFile($viewFile, $params, $context); 
} 

5.find視圖文件，獲取視圖文件路徑

protected function findViewFile($view, $context = null) 
{ 
    if (strncmp($view, '@', 1) === 0) { 
     // e.g. "@app/views/main" 
     $file = Yii::getAlias($view); 
    } elseif (strncmp($view, '//', 2) === 0) { 
     // e.g. "//layouts/main" 
     $file = Yii::$app->getViewPath() . DIRECTORY_SEPARATOR . ltrim($view, '/'); 
    } elseif (strncmp($view, '/', 1) === 0) { 
     // e.g. "/site/index" 
     if (Yii::$app->controller !== null) { 
      $file = Yii::$app->controller->module->getViewPath() . DIRECTORY_SEPARATOR . ltrim($view, '/'); 
     } else { 
      throw new InvalidCallException("Unable to locate view file for view '$view': no active controller."); 
     } 
    } elseif ($context instanceof ViewContextInterface) { 
     $file = $context->getViewPath() . DIRECTORY_SEPARATOR . $view; 
    } elseif (($currentViewFile = $this->getViewFile()) !== false) { 
     $file = dirname($currentViewFile) . DIRECTORY_SEPARATOR . $view; 
    } else { 
     throw new InvalidCallException("Unable to resolve view file for view '$view': no active view context."); 
    } 

    if (pathinfo($file, PATHINFO_EXTENSION) !== '') { 
     return $file; 
    } 
    $path = $file . '.' . $this->defaultExtension; 
    if ($this->defaultExtension !== 'php' && !is_file($path)) { 
     $path = $file . '.php'; 
    } 
    return $path; 
} 

6.render這個視圖文件

public function renderFile($viewFile, $params = [], $context = null) 
{ 
    $viewFile = Yii::getAlias($viewFile); 
    if ($this->theme !== null) { 
     $viewFile = $this->theme->applyTo($viewFile); 
    } 
    if (is_file($viewFile)) { 
     $viewFile = FileHelper::localize($viewFile); 
    } else { 
     throw new ViewNotFoundException("The view file does not exist: $viewFile"); 
    } 

    $oldContext = $this->context; 
    if ($context !== null) { 
     $this->context = $context; 
    } 
    $output = ''; 
    $this->_viewFiles[] = $viewFile; 

    if ($this->beforeRender($viewFile, $params)) { 
     Yii::trace("Rendering view file: $viewFile", __METHOD__); 
     $ext = pathinfo($viewFile, PATHINFO_EXTENSION); 
     if (isset($this->renderers[$ext])) { 
      if (is_array($this->renderers[$ext]) || is_string($this->renderers[$ext])) { 
       $this->renderers[$ext] = Yii::createObject($this->renderers[$ext]); 
      } 
      /* @var $renderer ViewRenderer */ 
      $renderer = $this->renderers[$ext]; 
      $output = $renderer->render($this, $viewFile, $params); 
     } else { 
      $output = $this->renderPhpFile($viewFile, $params); 
     } 
     $this->afterRender($viewFile, $params, $output); 
    } 

    array_pop($this->_viewFiles); 
    $this->context = $oldContext; 

    return $output; 
} 

7.如果主題不爲空，則系統會調用$ this-> theme-> applyTo（$ viewFile）來獲取主題視圖文件和renderPhpFile

$output = $this->renderPhpFile($viewFile, $params); 

8.get the conten t的文件

Answer 1

發生這種情況是因爲當Yii2在config/components中執行渲染檢查時，視圖容器direrctory的實際映射。

這可以與所有的意見，你的情況

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

或可與一些廠商或模作爲

'view' => [ 
    'theme' => [ 
     'pathMap' => [ 
      '@dektrium/user/views' => '@backend/views/my-view-user' // mapping per overriding s dektrium views with personal views 
     ], 
    ], 
], 

你可以看看的意見參考文檔http://www.yiiframework.com/doc-2.0/yii-base-view.html

和https://github.com/yiisoft/yii2/blob/master/framework/base/View.php