创建可重用控制器
在Yii中,你可以创建可复用的控制器。如果你创建许多应用或者控制器,他们有相同的类型,将所有常用的代码移动到一个可复用的控制器中将会节省很多时间。
在本小节中,我们将会尝试创建一个常用的CleanController
,它会清理临时文件夹以及flush缓存数据。
准备
按照官方指南http://www.yiiframework.com/doc-2.0/guide-start-installation.html的描述,使用Composer包管理器创建一个新的yii2-app-basic
应用。
如何做...
执行如下步骤,创建可复用的控制器:
- 创建
cleaner
目录,并添加独立CleanController
控制器:
<?php
namespace app\cleaner;
use Yii;
use yii\filters\VerbFilter;
use yii\helpers\FileHelper;
use yii\web\Controller;
class CleanController extends Controller
{
public $assetPaths = ['@app/web/assets'];
public $runtimePaths = ['@runtime'];
public $caches = ['cache'];
public function behaviors()
{
return [
'verbs' => [
'class' => VerbFilter::className(),
'actions' => [
'assets' => ['post'],
'runtime' => ['post'],
'cache' => ['post'],
],
],
];
}
public function actionIndex()
{
return $this->render('@app/cleaner/views/index');
}
public function actionAssets()
{
foreach ((array)$this->assetPaths as $path) {
$this->cleanDir($path);
Yii::$app->session->addFlash(
'cleaner',
'Assets path "' . $path . '" is cleaned.'
);
}
return $this->redirect(['index']);
}
public function actionRuntime()
{
foreach ((array)$this->runtimePaths as $path) {
$this->cleanDir($path);
Yii::$app->session->addFlash(
'cleaner',
'Runtime path "' . $path . '" is cleaned.'
);
}
return $this->redirect(['index']);
}
public function actionCache()
{
foreach ((array)$this->caches as $cache) {
Yii::$app->get($cache)->flush();
Yii::$app->session->addFlash(
'cleaner',
'Cache "' . $cache . '" is cleaned.'
);
}
return $this->redirect(['index']);
}
private function cleanDir($dir)
{
$iterator = new \DirectoryIterator(Yii::getAlias($dir));
foreach($iterator as $sub) {
if(!$sub->isDot() && $sub->isDir()) {
FileHelper::removeDirectory($sub->getPathname());
}
}
}
}
- 为
actionIndex
方法创建cleaner/views/index.php
视图文件:actionIndex
<?php
use yii\helpers\Html;
/* @var $this yii\web\View */
$this->title = 'Cleaner';
$this->params['breadcrumbs'][] = $this->title;
?>
<div class="clean-index">
<h1><?= Html::encode($this->title) ?></h1>
<?php if (Yii::$app->session->hasFlash('cleaner')): ?>
<?php foreach
((array)Yii::$app->session->getFlash('cleaner', []) as
$message): ?>
<div class="alert alert-success">
<?= $message ?>
</div>
<?php endforeach; ?>
<?php endif; ?>
<p>
<?= Html::a('Clear Caches', ['cache'], [
'class' => 'btn btn-primary',
'data' => [
'confirm' => 'Are you sure you want to clear all cache data?',
'method' => 'post',
],
]) ?>
<?= Html::a('Clear Assets', ['assets'],
['class' => 'btn btn-primary',
'data' => [
'confirm' => 'Are you sure you want to clear all temporary assets?',
'method' => 'post',
],
]) ?>
<?= Html::a('Clear Runtime', ['runtime'],
['class' => 'btn btn-primary',
'data' => [
'confirm' => 'Are you sure you want to clear all runtime files?',
'method' => 'post',
],
]) ?>
</p>
</div>
- 配置
config/web.php
的controllerMap
部分,附加控制器到应用中:
$config = [
'id' => 'basic',
'basePath' => dirname(__DIR__),
'bootstrap' => ['log'],
'controllerMap' => [
'clean' => 'app\cleaner\CleanController',
],
'components' => [
...
]
...
];
- 添加一个新的条目到主菜单中:
echo Nav::widget([
'options' => ['class' => 'navbar-nav navbar-right'],
'items' => [
['label' => 'Home', 'url' => ['/site/index']],
['label' => 'Cleaner', 'url' => ['/clean/index']],
['label' => 'About', 'url' => ['/site/about']],
...
],
]);
- 打开控制器,并清理assets:
- 如果你用的是yii2高级应用模板,只需要在配置中指定正确的路径:
'controllerMap' => [
'clean' => 'app\cleaner\CleanController',
'assetPaths' => [
'@backend/web/assets',
'@frontend/web/assets',
],
'runtimePaths' => [
'@backend/runtime',
'@frontend/runtime',
'@console/runtime',
],
],
现在我们可以附加这个控制器到任何应用中。
工作原理...
当你运行一个应用时,假如路由是clean/index
,指向CleanController::actionIndex
,Yii检查controllerMap
是否定义了。因为这里我们有一个干净的控制器,Yii会执行它,而不是像常用的方式。
在这个控制器中,我们定义了assetPaths
,runtimePaths
和caches
属性,这能够连接这个控制器到应用的不同路径和缓存结构。当附加这个控制器的时候设置它。
参考
- 为了更多关于控制器和控制器map的信息,参考http://www.yiiframework.com/doc-2.0/guide-structure-controllers.html
- 本章中的创建可复用控制器小节