Laravel框架实现多个视图共享相同数据的方法详解

$menu = DB::table('menu')- get();
return view('xx',['menu'= $menu]);

class BaseController{
  protected $menu = null;//菜单数据
  public function __construct(){
    $this- getMenu();//获取导航菜单
  }
  public function getMenu(){
    $this- menu = DB::table('menu')- get();
  }
}

class AController extends BaseController{
  public function index(){
    return view('admin.index',['menu'= $this- menu,'user'= $user]);
  }
}

<?php
namespace AppProviders;
use IlluminateSupportFacadesView;
use IlluminateSupportServiceProvider;
class ComposerServiceProvider extends ServiceProvider {
  /**
   * Register bindings in the container.
   *
   * @return void
   */
  public function boot() {
    // 基于类的view composer
    View::composer(
      'admin.common.*', 'AppHttpViewComposersAdminComposer'
    );
  }
  /**
   * Register the service provider.
   *
   * @return void
   */
  public function register() {
    //
  }
}

AppProvidersComposerServiceProvider::class,

<?php
namespace AppHttpViewComposers;
use AppLibsCommonUtils;
use IlluminateHttpRequest;
use IlluminateViewView;
class AdminComposer {
  private $data = null;//CommonUtils对象
  public function __construct(Request $request) {
    $this- data = new CommonUtils($request);//新建一个CommonUtils对象
  }
  public function compose(View $view) {
    $view- with([
      'admin' =  $this- data- admin,
      'mbx' =  $this- data- mbx,
      'menu' =  $this- data- menu,
      'msg' =  $this- data- msg
    ]);//填充数据
  }
}

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2017/4/20 0020
 * Time: 19:49
 */
namespace AppLibs;
use AppAdmin;
use AppPerm;
use IlluminateHttpRequest;
use IlluminateSupportFacadesDB;
class CommonUtils {
  public $admin = null;//管理员对象
  public $menu = null;//菜单对象
  public $mbx = null;//面包屑对象
  public $msg = null;//消息对象
  /**
   * 构造函数
   */
  public function __construct(Request $request) {
    $this- init($request);
  }
  /**
   * 初始化函数
   */
  private function init(Request $request) {
    $this- getAdmin($request);
    $this- getMsg();
    $this- getMenu($request);
    $this- getMbx($request);
  }
  /**
   * 获取管理员数据
   */
  private function getAdmin() {
    $this- admin = session('admin');
  }
  /**
   * 获取后台菜单数据
   */
  private function getMenu(Request $request) {
    $menu = DB::table('menu')- where('parentid', 0)- orderBy('sort')- get();
    $router = $request- getPathInfo();
    $perm = new Perm();
    $mbx = $perm- getMbx($router);
    foreach ($menu as $k =  $m) {
      $m- active = '';
      //读取子菜单
      $childMenu = DB::table('menu')- where('parentid', $m- id)- orderBy('sort')- get();
      if (count($childMenu)   0) {
        foreach($childMenu as $v){
          $v- active = '';
          if($mbx[0]- router == $v- router){
            $v- active = 'active';
            $m- active = 'active';
          }
        }
        $m- childMenu = $childMenu;
      } else {
        $m- childMenu = null;
      }
    }
    $this- menu = $menu;
  }
  /**
   * 获取面包屑
   */
  private function getMbx(Request $request) {
    $router = $request- getPathInfo();
    $perm = new Perm();
    $mbx = $perm- getMbx($router);
    $this- mbx = $mbx;
  }
  /**
   * 获取未读消息
   */
  private function getMsg() {
    $adminModel = new Admin();
    $toId = $this- admin- id;
    $this- msg = $adminModel- getUnReadMsg($toId);
  }
}