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 appcontrollers;

use appehaviorsReturnDataTypeBehaviors;
use apphelpersUtil;
use yiihelpersUrl;
use yiiwebController;
use appmodelsConfiguration;
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