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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def add_string_pairs_from_text_field_element(xib_file, results, text_field, special_ui_components_prefix):
 """ 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. """

    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)