code: def add_string_pairs_from_text_field_element(xib_file, results, text_field, special_ui_components_prefix):
      
      text_field_entry_comment = extract_element_internationalized_comment(text_field)
      if text_field_entry_comment is None:
          return
  
      if text_field.hasAttribute('usesAttributedText') and text_field.attributes['usesAttributedText'].value == 'YES':
          add_string_pairs_from_attributed_ui_element(results, text_field, text_field_entry_comment)
      else:
          try:
              text_field_entry_key = text_field.attributes['text'].value
              results.append((text_field_entry_key, text_field_entry_comment + ' default text value'))
          except KeyError:
              pass
      try:
          text_field_entry_key = text_field.attributes['placeholder'].value
          results.append((text_field_entry_key, text_field_entry_comment + ' placeholder text value'))
      except KeyError:
          pass
      warn_if_element_not_of_class(text_field, 'TextField', special_ui_components_prefix)
docs: Adds string pairs from a textfield element.
  
      Args:
          xib_file (str): Path to the xib file.
          results (list): The list to add the results to.
          text_field(element): The textfield element from the xib, to extract the string pairs from.
          special_ui_components_prefix (str):
              If not None, extraction will not warn about internationalized UI components with this class prefix.