Yii2 behavior运用

 class ReturnDataTypeBehaviors extends Behavior
 {

     public $type = 'json';
     public $pcOrMobile = 'pc'; // or  mobile

     //控制器执行之后事件
     public function events()
     {
         return [Controller::EVENT_BEFORE_ACTION => 'beforeType'];
     }

     /**
      * 返回数据类型判断
      * @param $event
      * @return bool
      */
     public function beforeType($event)
     {
         if ($this->pcOrMobile == 'pc') {
             if (Yii::$app->request->isAjax) {
                 if ($this->type == 'json') {
                     Yii::$app->response->format = Response::FORMAT_JSON;
                 } elseif ($this->type == 'xml') {
                     Yii::$app->response->format = Response::FORMAT_XML;
                 }
             }
         } else {
             if ($this->type == 'json') {
                 Yii::$app->response->format = Response::FORMAT_JSON;
             } elseif ($this->type == 'xml') {
                 Yii::$app->response->format = Response::FORMAT_XML;
             }
         }
         return true;
     }

 }

写在BaseController 里面 ，其他的控制器继承Base ,设定请求返回的数据

 <?php

 namespace app\controllers;

 use app\behaviors\ReturnDataTypeBehaviors;
 use app\helpers\Util;
 use yii\helpers\Url;
 use yii\web\Controller;
 use app\models\Configuration;
 use Yii;

 class BaseController extends Controller
 {
     /**
      * 默认分页值 默认10
     */
     const PAGE_SIZE = 6;

     public function behaviors()
     {
         return [

             'myBehavior' => [

                 'class' => ReturnDataTypeBehaviors::className(),
                 # 'type'=>'json',
                 #'pcOrMobile'=>'pc'
             ]
         ];
     }
     public function init()
     {
         //设置回调url
         $this->_redirectUrl();
         // 登录验证
         $this->_checkLogin();
         //session存留时间
         $this->_setSessionTime();
     }

     // 登录回调
     private function _redirectUrl()
     {
         $redirectUrl = Yii::$app->request->url;

         if ($redirectUrl == '/site/login') {

             $redirectUrl = '/desktop';
         }
         //设置登录后的回调路径
         Yii::$app->session->setFlash('redirectUrl', $redirectUrl);
     }

     // 权限验证
     private function _rbac()
     {

         //超级管理员不用过滤

     }

     // 登录验证
     private function  _checkLogin()
     {
         if (!(Yii::$app->request->url == '/site/login') && !Yii::$app->user->getId()) {
         header('Location:'.Yii::$app->request->getHostInfo().'/site/login');
         exit;
     }

     }
     //弹出小框提示
     public function TipsBox($msg='',$url='')
     {

     }
     //设置session的存储时间
     private function _setSessionTime()
     {
         Yii::$app->session->setTimeout(1440 * 2 );
     }

 }

Controller::EVENT_BEFORE_ACTION => 'beforeType' 触发事件调用‘beforeType’方法