Method removeField

/**
 * Method to remove a field from the form definition.
 *
 * @param   string  $name   The name of the form field for which remove.
 * @param   string  $group  The optional dot-separated form group path on which to find the field.
 *
 * @return  boolean  True on success, false otherwise.
 *
 * @since   1.7.0
 * @throws  \UnexpectedValueException
 */
public function removeField($name, $group = null)
{
    // Make sure there is a valid Form XML document.
    if (!$this->xml instanceof \SimpleXMLElement) {
        throw new \UnexpectedValueException(sprintf('%s::%s `xml` is not an instance of SimpleXMLElement', \get_class($this), __METHOD__));
    }
    // Find the form field element from the definition.
    $element = $this->findField($name, $group);
    // If the element exists remove it from the form definition.
    if ($element instanceof \SimpleXMLElement) {
        $dom = dom_import_simplexml($element);
        $dom->parentNode->removeChild($dom);
        return true;
    }
    return false;
}