这里没有专门的钩子。然而，钩子switch_theme 应该对你有用。

/**
 * Switches current theme to new template and stylesheet names.
 *
 * @since unknown
 * @uses do_action() Calls \'switch_theme\' action on updated theme display name.
 *
 * @param string $template Template name
 * @param string $stylesheet Stylesheet name.
 */
function switch_theme($template, $stylesheet) {
    update_option(\'template\', $template);
    update_option(\'stylesheet\', $stylesheet);
    delete_option(\'current_theme\');
    $theme = get_current_theme();
    do_action(\'switch_theme\', $theme);
}

add_action(\'switch_theme\', function($theme){
    if ( \'Your_Theme_Name\' == $theme )
    {
        // do something.
    }

    // do others.

    return;
});