在自定义类中注入 Laravel 5.1“Illuminate\Http\Request”？

这是我的简单应用\库\Gelocation.php class,

namespace App\Libraries;

use Location;
use Illuminate\Http\Request;

class GeoLocation
{
    public function getLocationByIP($ip = null)
    {
        // If IP address is set
        if ($ip) {
            $location = Location::get($ip);
        } else {
            $location = Location::get();
        }

        // Get the location by city
        return $location->cityName;
    }

    public function getLocationByCoordinates($longitute, $latitude)
    {
        //
    }

    public function getLocation(Request $request)
    {
        // Check if the location is already set in the cookie
        if ($request->cookie('location')) {
            return $request->cookie('location');
        } else {
            $location = $this->getLocationByIP();

            // Set location in the cookie
            $request->cookie()->forever('location', $location);

            return $location;
        }
    }
}

我在我的课程中使用这个课程页面控制器.php控制器如下，

namespace App\Http\Controllers;

use App\Libraries\GeoLocation;
use Illuminate\Http\Request;

use App\Http\Requests;
use App\Http\Controllers\Controller;

class PagesController extends Controller
{
    public $location;

    public function __construct(GeoLocation $location)
    {
        $this->location = $location;
    }

    public function index()
    {
        dd($this->location->getLocation());
        return view('pages.index');
    }
}

但是，当我运行此代码时，我收到此错误，

GeoLocation.php 第 28 行中的 ErrorException：

传递给 App\Libraries\GeoLocation::getLocation() 的参数 1 必须是 Illuminate\Http\Request 的实例，未给出，在中调用 /var/www/blogs/app/Http/Controllers/PagesController.php 第 22 行和 定义的

你只需要注入Request在 Geolocation 构造函数中，如下所示：

namespace App\Libraries;

use Location;
use Illuminate\Http\Request;

class GeoLocation
{   

   public function __construct(Request $request){
       $this->request = $request;
   }

    public function getLocationByIP($ip = null)
    {
        // If IP address is set
        if ($ip) {
            $location = Location::get($ip);
        } else {
            $location = Location::get();
        }

        // Get the location by city
        return $location->cityName;
    }

    public function getLocationByCoordinates($longitute, $latitude)
    {
        //
    }

    public function getLocation() //no need to inject here
    {
        // Check if the location is already set in the cookie
        if ($this->request->cookie('location')) {
            return $request->cookie('location');
        } else {
            $location = $this->getLocationByIP();

            // Set location in the cookie
            $request->cookie()->forever('location', $location);

            return $location;
        }
    }
}