laravel 服务提供者 facade初使用及理解

使用服务提供者注册服务进行依赖注入后可以直接Class::method()调用否则得自己new一个实例

<?phpnamespace App\Providers;use Illuminate\Support\ServiceProvider;class MyViewComposer extends ServiceProvider{    /**     * Bootstrap the application services.     *     * @return void     */    public function boot()    {        //    }    /**     * Register the application services.     *     * @return void     */    public function register()    {        $this->app->singleton('myviewcomposera',function(){            //return new TestService();            return new \App\Http\ViewComposers\MyViewComposer;        });        $this->app->bind('App\Contracts\ComposerContract', function() //两种绑定方式        {            return new \App\Http\ViewComposers\MyViewComposer;        });    }}

facade其实就是创建一个静态类

<?phpnamespace App\Facades;use Illuminate\Support\Facades\Facade;class MyViewComposer extends Facade {    protected static function getFacadeAccessor() { return 'myviewcomposera'; }}

config文件夹app.php中注册别名

 'MyViewComposer' => App\Facades\MyViewComposer::class,

创建契约接口方便后面依赖注入

<?phpnamespace App\Contracts;use Illuminate\Contracts\View\View;interface ComposerContract{    public function compose(View $view);    public function setnavbar($data);  }

创建类

<?php namespace App\Http\ViewComposers;use Illuminate\Contracts\View\View;use App\Contracts\ComposerContract;use Cache;use Carbon\Carbon;class MyViewComposer implements ComposerContract{    public function compose(View $view)    {         $view->with('sitename',Cache::get('navbar',[1,0,0,0]));    }    public function setnavbar($data){    Cache::put('navbar', $data, Carbon::now()->addSeconds(300));    }}

使用

<?phpnamespace App\Http\Controllers\Admin;use Illuminate\Http\Request;use App\Http\Controllers\Controller;use App\Role;use App\Permission;use App\Contracts\ComposerContract;//use App\Facades\MyViewComposer; //使用全名use MyViewComposer;//使用别名class RoleController extends Controller{//自己进行依赖注入    public function __construct(ComposerContract $test){ //需要取消使用全名注释        $this->composer = $test;    }    public function welcome()    {    $users=Role::get();    foreach ($users as $user) {    $user->permissions;    }    // $this->composer->setnavbar([0,0,0,[1,0,0]]);          MyViewComposer::setnavbar([0,0,0,[1,0,0]]);    //Cache::put('navbar', [0,0,1,0], Carbon::now()->addSeconds(300));    return view('admin/role',['roledata'=>$users,'permissions'=>Permission::all()]);    }}

facade就相当于帮你依赖注入了