BindingResolutionException和目标未实例化

Question

错误：

BindingResolutionException in Container.php line 887: 
Target [App\Helpers\Contracts\AccessTokenInterface] is not instantiable. 

路线：

Route::get('/', 'LoginController@handleProviderCallback'); 

控制器：

namespace App\Http\Controllers; 

use App\Helpers\Contracts\AccessTokenInterface; 

class LoginController extends Controller 
{ 

    public function handleProviderCallback(AccessTokenInterface $accessTokenInstance) 
    { 

     return $accessTokenInstance->getSomething(); 
    } 
} 

提供者：

namespace App\Providers; 

use Illuminate\Support\ServiceProvider; 
use App\Helpers\Contracts\AccessTokenInterface; 
use AccessToken; 

class TokenServiceProvider extends ServiceProvider 
{ 
    protected $defer = true; 

    public function boot() 
    { 
     // 
    } 

    public function register() 
    { 
     $this->app->bind('AccessTokenInterface::class', function(){ 
      return new AccessToken(); 
     }); 
    } 
} 

助手：

namespace App\Helpers; 

use App\Helpers\Contracts\AccessTokenInterface; 

class AccessToken implements AccessTokenInterface 
{ 
    protected $something; 

    public function setSomething() 
    { 
     $something = 100; 
    } 

    public function __construct() 
    { 
     $this->setSomething(); 
    } 

    public function getSomething(){ 
     return $something; 
    } 

接口：

namespace App\Helpers\Contracts; 

Interface AccessTokenInterface 
{ 

    public function getSomething(); 
    public function setSomething(); 
} 

我已经注册的供应商提供商和的accessToken在Helper的别名。

我已阅读一些计算器的答案，但无法找到解决方案。我是新来的。

我哪里去错了？

Answer 1

在您的提供商取下bind方法引号：

$this->app->bind(AccessTokenInterface::class, function(){ 
    return new AccessToken(); 
});