woocommerce custom shipping method not appearing in shipping zone - php

Question

EDITED - Progress made on original post
I have created a simple custom shipping method plugin stub (see code below).
The plugin is registered and now appears in the shipping method dropdown when I'm creating a shipping zone. However when selected the custom field doesn't appear for the shipping zone (see gif)
<?php
if ( ! defined( 'ABSPATH' ) ) {
exit; // Exit if accessed directly
}
if (in_array('woocommerce/woocommerce.php', apply_filters('active_plugins', get_option('active_plugins')))) {
function launch_shipping_method() {
if (!class_exists('Launch_Shipping_Method')) {
class Launch_Shipping_Method extends WC_Shipping_Method {
public function __construct( $instance_id = 0 ) {
$this->id = 'launch_shipping';
$this->instance_id = absint( $instance_id );
$this->method_title = __('Launch Simple Shipping', 'launch_shipping');
$this->method_description = __('Custom Simple Shipping Method', 'launch_shipping');
$this->supports = array(
'shipping-zones',
'instance-settings',
'instance-settings-modal',
);
$this->init();
}
/**
* Initialize Launch Simple Shipping.
*/
public function init() {
// Load the settings.
$this->init_form_fields();
$this->init_settings();
// Define user set variables.
$this->title = isset($this->settings['title']) ? $this->settings['title'] : __('Launch Shipping', 'launch_shipping');
add_action('woocommerce_update_options_shipping_' . $this->id, array($this, 'process_admin_options'));
}
/**
* Init form fields.
*/
public function init_form_fields() {
$this->form_fields = array(
'title' => array(
'title' => __( 'Title', 'launch_shipping' ),
'type' => 'text',
'description' => __( 'This controls the title which the user sees during checkout.', 'launch_shipping' ),
'default' => $this->method_title,
'desc_tip' => true,
)
);
}
/**
* Get setting form fields for instances of this shipping method within zones.
*
* #return array
*/
public function get_instance_form_fields() {
return parent::get_instance_form_fields();
}
/**
* Always return shipping method is available
*
* #param array $package Shipping package.
* #return bool
*/
public function is_available( $package ) {
$is_available = true;
return apply_filters( 'woocommerce_shipping_' . $this->id . '_is_available', $is_available, $package, $this );
}
/**
* Free shipping rate applied for this method.
*
* #uses WC_Shipping_Method::add_rate()
*
* #param array $package Shipping package.
*/
public function calculate_shipping( $package = array() ) {
$this->add_rate(
array(
'label' => $this->title,
'cost' => 0,
'taxes' => false,
'package' => $package,
)
);
}
}
}
}
add_action('woocommerce_shipping_init', 'Launch_Shipping_Method');
function add_launch_shipping_method($methods) {
$methods[] = 'launch_shipping_method';
return $methods;
}
add_filter('woocommerce_shipping_methods', 'add_launch_shipping_method');
}

Answer 1

Try this:
function add_launch_shipping_method($methods) {
$methods['launch_shipping'] = 'launch_shipping_method';
return $methods;
}
It should fix things. If you need to debug it or want to understand more have a look at:
wp-content/plugins/woocommerce/includes/class-wc-shipping-zone.php
look at
function add_shipping_method($type)
Briefly: the id you register the class with in your woocommerce_shipping_init hook must match the class id property (the one you set with $this->id = 'launch_shipping';)