Yii2 behavior運用

class ReturnDataTypeBehaviors extends Behavior
{

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

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

    /**
     * 返回數據類型判斷
     * @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;
    }

}

寫在BaseController 里面 ，其他的控制器繼承Base ,設定請求返回的數據

<?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
{
    /**
     * 默認分頁值 默認10
    */
    const PAGE_SIZE = 6;
    
    
    public function behaviors()
    {
        return [

            'myBehavior' => [

                'class' => ReturnDataTypeBehaviors::className(),
                # 'type'=>'json',
                #'pcOrMobile'=>'pc'
            ]
        ];
    }
    public function init()
    {
        //設置回調url
        $this->_redirectUrl();
        // 登錄驗證
        $this->_checkLogin();
        //session存留時間
        $this->_setSessionTime();
    }

    // 登錄回調
    private function _redirectUrl()
    {
        $redirectUrl = Yii::$app->request->url;

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

            $redirectUrl = '/desktop';
        }
        //設置登錄后的回調路徑
        Yii::$app->session->setFlash('redirectUrl', $redirectUrl);
    }

    // 權限驗證
    private function _rbac()
    {

        //超級管理員不用過濾


    }

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

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

    }
    //設置session的存儲時間
    private function _setSessionTime()
    {
        Yii::$app->session->setTimeout(1440 * 2 );
    }

}

?

Controller::EVENT_BEFORE_ACTION => 'beforeType' 觸發事件調用‘beforeType’方法