我有这个问题，我需要一个CPT有几个布局选项和使用模板。最初，WP不支持自定义帖子的模板，但我知道可以通过元框自定义数据手动完成。

这是我在函数中的代码片段，可以选择模板并保存它。它工作正常-将数据添加到数据库并保存/更新模板。我的问题是在最后一部分，我试图将主题重定向到正确的模板，以及它不起作用的一些原因。

 // --------Add actions
 add_action(\'add_meta_boxes\', \'custom_template_add_custom_box\');

 /* Do something with the data entered */
 add_action(\'save_post\', \'custom_template_save_postdata\');


 // --------Add functions
 /* Adds a box to the main column on the Post and Page edit screens */
 function custom_template_add_custom_box() {
     add_meta_box( \'custom-post-type-choice\', \'Choose custom template\', \'custom_template_inner_box\', \'campaign\', \'side\' );
 }

 /* Prints the box content */
 function custom_template_inner_box( $post ) {

     // Use nonce for verification
     wp_nonce_field( plugin_basename(__FILE__), \'custom_template_noncename\' );

     if ( 0 != count( get_page_templates() ) ) {
         $page_template = get_post_meta($post->ID, \'_wp_page_template\', TRUE); ?>
     <p><strong><?php _e(\'Template\') ?></strong></p>
     <label class="screen-reader-text" for="page_template"><?php _e(\'Page Template\') ?></label>
     <select name="page_template" id="page_template">
         <option value=\'default\'><?php _e(\'Default Template\'); ?></option>
         <?php page_template_dropdown($page_template); ?>
     </select>
 <?php }
 }

 /* When the post is saved, saves our custom data */
 function custom_template_save_postdata( $post_id ) {

     // verify this came from the our screen and with proper authorization,
     // because save_post can be triggered at other times

     if ( !isset( $_POST[\'custom_template_noncename\'] ) || !wp_verify_nonce( $_POST[\'custom_template_noncename\'], plugin_basename(__FILE__) ) )
         return $post_id;

     // verify if this is an auto save routine. 
     // If it is our form has not been submitted, so we dont want to do anything
     if ( defined(\'DOING_AUTOSAVE\') && DOING_AUTOSAVE ) 
         return $post_id;


     // Check permissions
     if ( \'page\' == $_POST[\'post_type\'] ) {
         if ( !current_user_can( \'edit_page\', $post_id ) )
             return $post_id;
         }
     else {
         if ( !current_user_can( \'edit_post\', $post_id ) )
             return $post_id;
     }

     // OK, we\'re authenticated: we need to find and save the data

     $page_template = $_POST[\'page_template\'];

     if ( !empty($page_template) && \'campaign\' == get_post_type($post_id) ) {
         $page_templates = get_page_templates();
         if ( \'default\' != $page_template && !in_array($page_template, $page_templates) ) {
             if ( $wp_error )
                 return new WP_Error(\'invalid_page_template\', __(\'The page template is invalid.\'));
             else
                 return 0;
         }
         update_post_meta($post_id, \'_wp_page_template\',  $page_template);
     }
 }

 /* Custom template redirection hook */

 function custom_template_redirect() {
     global $post;

     if ( is_single() && \'campaign\' == get_post_type($post) ) {
         $page_template = get_page_template();
         include($page_template);
         exit;
     }
 }
 add_action("template_redirect", \'custom_template_redirect\');