我正在为woocommerce制定一种定制发货方法，我的问题是，可以将其添加到管理区域的特定区域&；调整设置即可。但出于某种原因，它没有出现在结账页面上——我也不知道为什么。

这应该是非常直接的，实际上我以前做过几次（3.0之前）-但我现在根本无法让它工作。

主要类别

abstract class Main_Shipping extends WC_Shipping_Method
{
abstract protected function register_shipping($methods);
abstract protected function addActions();
abstract protected function addFilters();

function init() 
{
    $this->instance_form_fields                     = include(\'setting/shipping-settings.php\' );
    $this->title                                    = $this->get_option(\'title\' );
    $this->tax_status                               = $this->get_option(\'tax_status\');
    $this->shipping_price                           = $this->get_option(\'shipping_price\');
    $this->enable_free_shipping                     = $this->get_option(\'enable_free_shipping\');
    $this->free_shipping_total                      = $this->get_option(\'free_shipping_total\');

    $this->init_settings(); 

    add_action( \'woocommerce_update_options_shipping_\' . $this->id, array( $this, \'process_admin_options\' ) );
}

public function calculate_shipping($package = array())
{
    global $woocommerce;
    $return_price = $this->shipping_price;
    if(!isset($return_price))
    {
       $return_price = 0;
    }
    $rate = array(
        \'id\'      => $this->id .\'_\'. $this->instance_id,
        \'label\'   => $this->title,
        \'cost\'    => $return_price,
       );
    $this->add_rate( $rate );
}

public function oaship_pickuppoint()
{ 
    ob_start();
    ?>
        <div>
            test
        </div>

    <?php
    $sContent = ob_get_clean();
    echo $sContent;
}
}

 require_once(\'main-shipping.php\');
 class GLS_Shipping_Pickuppoint extends Main_Shipping
{
public function __construct( $instance_id = 0 ) 
{
    $this->id                    = \'gls_shipping_pickuppoint\';
    $this->instance_id           = absint( $instance_id );
    $this->method_title          = __(\'GLS Pickup Point OA\', \'\');
    $this->method_description    = __(\'Adds the option to ship with the GLS pickup point to the checkout\', \'\');
    $this->supports              = array(
        \'shipping-zones\',
        \'instance-settings\',
    );
    $this->init(); 
}

function addActions()
{     
    add_action(\'woocommerce_after_shipping_rate\', array($this, \'check_choosen_shipping_method\') );
}

function addFilters()
{
    add_filter(\'woocommerce_shipping_methods\', array($this, \'register_shipping_method\'));
}

function register_shipping($methods) 
{

    $methods[\'gls_shipping_pickuppoint\'] = \'GLS_Shipping_Pickuppoint\';

    return $methods;
}

function check_choosen_shipping_method($rate)
{

    $chosen_methods = WC()->session->get( \'chosen_shipping_methods\' );
    $chosen_shipping = preg_replace(\'/[0-9]+/\', \'\', $chosen_methods[0]);;
    if($chosen_shipping === \'gls_shipping_pickuppoint\')
    {
        if ($rate->method_id == \'gls_shipping_pickuppoint\') {
            $this->oaship_pickuppoint();
        }
    }
}
}

$oOAGlsPickupPoint = new GLS_Shipping_Pickuppoint();
$oOAGlsPickupPoint->addActions();
 $oOAGlsPickupPoint->addFilters();