自定义插件开发获取帮助上下文以在WP 4.3中工作

我被自定义插件的“帮助”选项卡卡住了。过去我用过

   //ADD HELP INFO
// add_action(\'contextual_help\', array($this, \'my_plugin_help\'));

现在我正在尝试转换插件帮助部分

    add_action(\'load-\' .CUSTOM_POST_TYPE, \'my_plugin_add_help\');
    function my_plugin_add_help() {

        wp_die(\'it works!\');
        $screen = get_current_screen();
        //
        $screen->add_help_tab(array(
            \'id\' => CUSTOM_POST_TYPE,
            \'title\' => \'Plugin help\',
            \'content\' => \'help content\'));       
    }

但是没有显示“帮助”选项卡？有什么建议吗？

[编辑]我意识到我在班上工作，所以这里有一点

    class Participant{

    public function __construct() {
add_action(\'load-\' .CUSTOM_POST_TYPE, \'my_plugin_add_help\');
.......
}

    function my_plugin_add_help() {

        wp_die(\'it works!\');
        $screen = get_current_screen();
        //
        $screen->add_help_tab(array(
            \'id\' => CUSTOM_POST_TYPE,
            \'title\' => \'Plugin help\',
            \'content\' => \'help content\'));       
    }

，但我仍然没有正确的钩。我测试过

add_action(\'admin_init\', array($this, \'my_plugin_add_help\'));

[编辑2]可行的解决方案

    class MyClass {


        public function __construct() {


            add_action(\'admin_head\' , array($this, \'my_plugin_add_help\'));
    ......
    }

     public function my_plugin_add_help() {

            $screen = get_current_screen();
            //print_r($screen);

            if($screen->post_type == CUSTOM_POST_TYPE){//make it only visible on custom plugin page
            $screen->add_help_tab(array(
                \'id\' => CUSTOM_POST_TYPE,
                \'title\' => \'Help title\',
                \'content\' => \'help content\'));
            }
        }
}

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