使用元发布图像值创建分页发布

Question

我有画廊帖子，价值帖子是meta帖子中的图片，我想像这样fiddle作此帖子，但我不知道该怎么做，我曾尝试使用此代码

<?php 
while ( have_posts() ) : the_post();
global $post;
$val = get_post_meta($post->ID,'value_gallery',false);
$args = array(
    'posts_per_page' => 6,
    'order'          => 'ASC',
    'post_mime_type' => 'image',
    // 'post_parent'    => the_ID(),
);

$attachments = get_children( $args );

if ( $attachments ) {
        foreach ($val as $key ) {
        $keys = explode(",", $key);
        foreach ($keys as $values) {
            ?>
     <div class="col-lg-4">
        <?php echo wp_get_attachment_image( $values,  "cherry-thumb-a", array( "class" => "img-responsive" ) );  ?>
     </div>
            <?php
        }
    }
}
?>
<!-- pagination -->
<div class="nav-pagination">
<?php the_posts_pagination( array(
'mid_size'  => 2,
'prev_text' => __( '<', 'textdomain' ),
'next_text' => __( '>', 'textdomain' ),) );
 ?>
 </div>

但是分页导航没有显示，并且显示项目仍未在每页显示6条，如果有人可以帮助我，我将很高兴