我还在学习设置API，所以请原谅我的noob问题。我有三个字段：复选框、颜色选择器和文本字段（它们正在工作），但我想这样做：安装主题后，将“选中”状态添加到我的复选框中，但允许用户“取消选中”，如果为空，则将默认颜色添加到我的颜色选择器中。。。我不知道怎么做，所以请帮帮我！

我的代码现在是这样的（谢谢@Chip Bennett！）：

<?php
add_action(\'admin_menu\',\'create_theme_options_page\');
function create_theme_options_page(){
add_options_page(\'Theme Options\',\'Theme Options\',\'administrator\',__FILE__,\'build_options_page\');
}
   function build_options_page(){
   ?>
   <div id="theme-options-wrap">
   <div style="float:left;margin-top:19px;position:absolute;" class="icon32" id="icon-tools"><br/></div>
   <h2>My options page</h2>
   <form method="post" action="options.php">
   <?php settings_fields(\'plugin_options\');?>
   <?php do_settings_sections(__FILE__); ?>
   <p class="submit">
   <input name="Submit" type="submit" class="button-primary" value="<?php esc_attr_e(\'Save changes\');?>"/>
   </p>
   </form>
   </div>
   <?php
   }

     add_action(\'admin_init\',\'register_and_build_fields\');
     function register_and_build_fields(){
     register_setting(\'plugin_options\',\'plugin_options\',\'validate_setting\');
     add_settings_section(\'main_section\',\'<br/><br/>Main Settings\',\'section_cb\',__FILE__);
     add_settings_field(\'banner_heading\',\'Banner Heading:\',\'banner_heading_setting\',__FILE__,\'main_section\');
     add_settings_field(\'display_sidebar\',\'Display Sidebar:\',\'display_sidebar_setting\',__FILE__,\'main_section\');
     add_settings_field(\'display_colorpicker\',\'Display Colorpicker:\',\'display_colorpicker_setting\',__FILE__,\'main_section\');
     }
       //Install Iris colorpicker
       add_action( \'admin_enqueue_scripts\', \'mw_enqueue_color_picker\' );
       function mw_enqueue_color_picker( $hook_suffix ) {
       // first check that $hook_suffix is appropriate for your admin page
       wp_enqueue_style( \'wp-color-picker\' );
       wp_enqueue_script( \'my-script-handle\', get_template_directory_uri() . \'/js/my-script.js\', array( \'wp-color-picker\' ), false, true );
       }

         //Colorpicker
         //Now how to add a default color on theme install?
         function display_colorpicker_setting(){
         $options = get_option(\'plugin_options\');
         echo"<input type=\'text\' id=\'color1\' name=\'plugin_options[display_colorpicker]\' value=\'{$options[\'display_colorpicker\']}\'/>";
         }

          //Sidebar checkbox
          //Now how to add a default state "checked" on theme install?
          function display_sidebar_setting(){
          $options = get_option(\'plugin_options\');
          echo "<input type=\'checkbox\' name=\'plugin_options[display_sidebar]\' {$options[\'display_sidebar\']} id=\'display_sidebar\' />";
          }

            //Banner Heading
            function banner_heading_setting(){
            $options = get_option(\'plugin_options\');
            echo "<input name=\'plugin_options[banner_heading]\' type=\'text\' value=\'{$options[\'banner_heading\']}\'/>";
            }
              //Validate our settings here
              function validate_setting($plugin_options){   
              return $plugin_options;
              }

               function section_cb(){
               }
?>