Undefined variable: (2/2) ErrorException in a View.

I'm trying to import a view to a file in pdf format and it says that I do not have the variable defined. I'm using laravel-dompdf and the migrations are in MySQL .

I have this error:

  

(2/2) ErrorException

     

Undefined variable: cartItems (View: /var/www/html/meso/resources/views/cart/index.blade.php)

PDFController

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Product;
use PDF;

class PDFController extends Controller
{
    public function pdf(Request $request){
    $products=Product::all();
    view()->share('products', $products);
    if ($request->has('descargar')) {

$pdf = PDF::loadView('cart.index');
        return $pdf->download('cotizacion');
    }
return view('cart.index');
}
}

My path in my file web

Route::get('/pdf', 'PDFController@pdf')->name('pdf');

My controller where he calls to my eyes that I want to import:

CartController

namespace App\Http\Controllers;

use App\Product;
use Gloudemans\Shoppingcart\Facades\Cart;
use Illuminate\Http\Request;

class CartController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
public function index()
{
    $cartItems=Cart::content();
    return view('cart.index',compact('cartItems'));
}

This is the view cart/index.blade.php and it's where I call my route in a button at the end of the code:

@extends('layouts.main')

@section('content')
    <div class="row">
        <h3>Cart Items</h3>


    <table class="table table-hover">
        <thead>
        <tr>
            <th>Name</th>
            <th>Price</th>
            <th>qty</th>
            <th>size</th>
            <th>Action</th>
        </tr>
        </thead>
        <tbody>
        @foreach($cartItems as $cartItem)
            <tr>
                <td>{{$cartItem->name}}</td>
                <td>{{$cartItem->price}}</td>
                <td width="50px">
                    {!! Form::open(['route' => ['cart.update',$cartItem->rowId], 'method' => 'PUT']) !!}
                    <input name="qty" type="text" value="{{$cartItem->qty}}">


                </td>
                <td>
                    <div > {!! Form::select('size', ['small'=>'Small','medium'=>'Medium','large'=>'Large'] , $cartItem->options->has('size')?$cartItem->options->size:'' ) !!}
                       </div>

                </td>

                <td>
                    <input style="float: left"  type="submit" class="button success small" value="Ok">
                    {!! Form::close() !!}

                    <form action="{{route('cart.destroy',$cartItem->rowId)}}"  method="POST">
                       {{csrf_field()}}
                       {{method_field('DELETE')}}
                       <input class="button small alert" type="submit" value="Delete">
                     </form>
                </td>
            </tr>
        @endforeach

        <tr>
            <td></td>
            <td>
                Tax: ${{Cart::tax()}} <br>
                Sub Total: $ {{Cart::subtotal()}} <br>
                Grand Total: $ {{Cart::total()}}
            </td>
            <td>Items: {{Cart::count()}}

            </td>
            <td></td>
            <td></td>

        </tr>
        </tbody>
    </table>

    <a href="{{route('checkout.shipping')}}" class="button">Checkout</a>
    <a href="{{route('pdf')}}" class="button small alert">Import to PDF</a>
</div>



@endsection