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 {
const _GlobalCupertinoLocalizationsDelegate();

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

static final Map> _loadedTranslations = >{};

@override
Future 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  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(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> delegates = >[

    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