我也遇到了同样的问题，最终解决了。基于您拥有的线程followed, 现在必须扩展WP-core/WP-includes/js/media视图的“更新”功能。js。

转到“jQuery（document）.ready（function（）…”“print\\u media\\u templates”操作的一部分，然后尝试以下操作：

<script>

    jQuery(document).ready(function()
    {
      wp.media.view.Settings.Gallery = wp.media.view.Settings.Gallery.extend({

        // add your custom options template (you probably already did this)
        template: function(view){
          return wp.media.template(\'gallery-settings\')(view)
               + wp.media.template(\'custom-gallery-setting\')(view);
        },

        // now extend the update function 
        update: function( key ) {

           // call originial function: you want to *extend* it, 
           // not to override it completely!
           wp.media.view.Settings.prototype.update.call( this, key );

           // get the current value of your gallery_image_title_text_size attribute
           var currentTextSize = this.model.attributes.gallery_image_title_text_size;

           // get the data-setting elements, in your case \'gallery_image_title_text_size\':
           $setting = this.$( \'[data-setting="gallery_image_title_text_size"]\' );

                    // for each of this setting (if it\'s a radio button),
                    // check the value stored by your attributes 
                    // and set the radio button accordingly
                    $setting.each( function ( index ) {
                        if ( $( this ).is( \'input[type="radio"]\' ) && 
                             currentTextSize == $( this ).val() ) {
                            $( this ).attr( \'checked\', true );
                        } else {
                            $( this ).attr( \'checked\', false );
                        }

                     } );
            }
        } );
    } );           
</script>