正确解决：Flutter Textfield长按报错修复:NosuchMethodError: The getter ‘pasterButtonLabel’ was ca ？？？？？？？？？

为什么叫正确解决？？
关于这个问题，我在百度上看过很多人的答案，基本无一例外都是，说：“Cupertino缺少了对应的非英文版本的支持”。
大家真的看过源码吗？真的是缺少Cupertino么？我是真不相信的，flutter出了这么多年，连个中文都不支持？然后我就查阅了源码：
我发现了这个类 GlobalCupertinoLocalizations
有木有很眼熟，他和
GlobalMaterialLocalizations & GlobalWidgetsLocalizations 没啥区别

class _GlobalCupertinoLocalizationsDelegate extends LocalizationsDelegate<CupertinoLocalizations> {
  const _GlobalCupertinoLocalizationsDelegate();

  @override
  bool isSupported(Locale locale) => kCupertinoSupportedLanguages.contains(locale.languageCode);

  static final Map<Locale, Future<CupertinoLocalizations>> _loadedTranslations = <Locale, Future<CupertinoLocalizations>>{};

  @override
  Future<CupertinoLocalizations> load(Locale locale) {
    assert(isSupported(locale));
    return _loadedTranslations.putIfAbsent(locale, () {
      util.loadDateIntlDataIfNotLoaded();

      final String localeName = intl.Intl.canonicalizedLocale(locale.toString());
      assert(
        locale.toString() == localeName,
        'Flutter does not support the non-standard locale form $locale (which '
        'might be $localeName',
      );

      late intl.DateFormat fullYearFormat;
      late intl.DateFormat dayFormat;
      late intl.DateFormat mediumDateFormat;
      // We don't want any additional decoration here. The am/pm is handled in
      // the date picker. We just want an hour number localized.
      late intl.DateFormat singleDigitHourFormat;
      late intl.DateFormat singleDigitMinuteFormat;
      late intl.DateFormat doubleDigitMinuteFormat;
      late intl.DateFormat singleDigitSecondFormat;
      late intl.NumberFormat decimalFormat;

      void loadFormats(String? locale) {
        fullYearFormat = intl.DateFormat.y(locale);
        dayFormat = intl.DateFormat.d(locale);
        mediumDateFormat = intl.DateFormat.MMMEd(locale);
        // TODO(xster): fix when https://github.com/dart-lang/intl/issues/207 is resolved.
        singleDigitHourFormat = intl.DateFormat('HH', locale);
        singleDigitMinuteFormat = intl.DateFormat.m(locale);
        doubleDigitMinuteFormat = intl.DateFormat('mm', locale);
        singleDigitSecondFormat = intl.DateFormat.s(locale);
        decimalFormat = intl.NumberFormat.decimalPattern(locale);
      }

      if (intl.DateFormat.localeExists(localeName)) {
        loadFormats(localeName);
      } else if (intl.DateFormat.localeExists(locale.languageCode)) {
        loadFormats(locale.languageCode);
      } else {
        loadFormats(null);
      }

      return SynchronousFuture<CupertinoLocalizations>(getCupertinoTranslation(
        locale,
        fullYearFormat,
        dayFormat,
        mediumDateFormat,
        singleDigitHourFormat,
        singleDigitMinuteFormat,
        doubleDigitMinuteFormat,
        singleDigitSecondFormat,
        decimalFormat,
      )!);
    });
  }

  @override
  bool shouldReload(_GlobalCupertinoLocalizationsDelegate old) => false;

  @override
  String toString() => 'GlobalCupertinoLocalizations.delegate(${kCupertinoSupportedLanguages.length} locales)';
}

源码中加载语言也没说不支持中文啊！！
还有网上很多配置本地化时候都是这么写的：

          GlobalMaterialLocalizations.delegate,
          GlobalWidgetsLocalizations.delegate,

仔细看了源码，我想说：
这么写不香么？？
GlobalMaterialLocalizations.delegates

  /// A value for [MaterialApp.localizationsDelegates] that's typically used by
  /// internationalized apps.
  ///
  /// ## Sample code
  ///
  /// To include the localizations provided by this class and by
  /// [GlobalWidgetsLocalizations] in a [MaterialApp],
  /// use [GlobalMaterialLocalizations.delegates] as the value of
  /// [MaterialApp.localizationsDelegates], and specify the locales your
  /// app supports with [MaterialApp.supportedLocales]:
  ///
  /// ```dart
  /// new MaterialApp(
  ///   localizationsDelegates: GlobalMaterialLocalizations.delegates,
  ///   supportedLocales: [
  ///     const Locale('en', 'US'), // English
  ///     const Locale('he', 'IL'), // Hebrew
  ///   ],
  ///   // ...
  /// )
  /// ```
  static const List<LocalizationsDelegate<dynamic>> delegates = <LocalizationsDelegate<dynamic>>[
    GlobalCupertinoLocalizations.delegate,
    GlobalMaterialLocalizations.delegate,
    GlobalWidgetsLocalizations.delegate,
  ];
}

仅此一篇文章，我希望大家认真阅读源码，提升水平