Flutter 如何更改CupertinodePicker显示语言?

Flutter 如何更改CupertinodePicker显示语言?,flutter,Flutter,我正跟着弗利特医生向库比诺达提克展示。但语言总是英语。请告诉我如何改变这个 这是我的代码: void _showDatePicker(BuildContext context, bool isYou) { showModalBottomSheet( context: context, builder: (context) { return CupertinoDatePicker( onDateTimeChange

我正跟着弗利特医生向库比诺达提克展示。但语言总是英语。请告诉我如何改变这个

这是我的代码:

void _showDatePicker(BuildContext context, bool isYou) {
    showModalBottomSheet(
        context: context,
        builder: (context) {
          return CupertinoDatePicker(
            onDateTimeChanged: (DateTime value) {
              setState(() {
                if (isYou) {
                  _dateOfBirth = value;
                } else {
                  _dateOfBirthAnother = value;
                }
              });
            },

            initialDateTime: DateTime.now(),
            mode: CupertinoDatePickerMode.date,
            maximumYear: 2018,
            minimumYear: 1950,
          );
        });
  }

将所需语言添加到MaterialApp(或CupertinoApp)配置中。 像这样:

return MaterialApp(
    localizationsDelegates: [
      // ... app-specific localization delegate[s] here
      GlobalMaterialLocalizations.delegate,
      GlobalWidgetsLocalizations.delegate,
      DefaultCupertinoLocalizations.delegate,
    ],
    supportedLocales: [
      const Locale('en', 'US'), // English
      const Locale('de', 'DE'), // German
      // ... other locales the app supports
    ],  <the rest of your configuration> );
此外,Cupertino小部件尚未完全本地化。 但是您可以编写自己的本地化配置类,并将它们添加到我的代码中的“DefaultCupertinoLocalizations.delegate”行下面

例如,为了在德语中使用CupertinodePicker,我必须创建自定义德语本地化,如下所示:

import 'dart:async';
import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/widgets.dart';


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

  @override
  bool isSupported(Locale locale) => locale.languageCode == 'de';

  @override
  Future<CupertinoLocalizations> load(Locale locale) => GermanCupertinoLocalizations.load(locale);

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

  @override
  String toString() => 'DefaultCupertinoLocalizations.delegate(de_DE)';
}

/// US English strings for the cupertino widgets.
class GermanCupertinoLocalizations implements CupertinoLocalizations {
  /// Constructs an object that defines the cupertino widgets' localized strings
  /// for US English (only).
  ///
  /// [LocalizationsDelegate] implementations typically call the static [load]
  /// function, rather than constructing this class directly.
  const GermanCupertinoLocalizations();

  static const List<String> _shortWeekdays = <String>[
    'Mo',
    'Di',
    'Mi',
    'Do',
    'Fr',
    'Sa',
    'So',
  ];

  static const List<String> _shortMonths = <String>[
    'Jan',
    'Feb',
    'Mär',
    'Apr',
    'Mai',
    'Jun',
    'Jul',
    'Aug',
    'Sep',
    'Okt',
    'Nov',
    'Dez',
  ];

  static const List<String> _months = <String>[
    'Januar',
    'Februar',
    'März',
    'April',
    'Mai',
    'Juni',
    'Juli',
    'August',
    'September',
    'Oktober',
    'November',
    'Dezember',
  ];



  @override
  String datePickerYear(int yearIndex) => yearIndex.toString();

  @override
  String datePickerMonth(int monthIndex) => _months[monthIndex - 1];

  @override
  String datePickerDayOfMonth(int dayIndex) => dayIndex.toString();

  @override
  String datePickerHour(int hour) => hour.toString();

  @override
  String datePickerHourSemanticsLabel(int hour) => hour.toString() + " Uhr";

  @override
  String datePickerMinute(int minute) => minute.toString().padLeft(2, '0');

  @override
  String datePickerMinuteSemanticsLabel(int minute) {
    if (minute == 1)
      return '1 Minute';
    return minute.toString() + ' Minuten';
  }

  @override
  String datePickerMediumDate(DateTime date) {
    return '${_shortWeekdays[date.weekday - DateTime.monday]} '
        '${_shortMonths[date.month - DateTime.january]} '
        '${date.day.toString().padRight(2)}';
  }

  @override
  DatePickerDateOrder get datePickerDateOrder => DatePickerDateOrder.mdy;

  @override
  DatePickerDateTimeOrder get datePickerDateTimeOrder => DatePickerDateTimeOrder.date_time_dayPeriod;

  @override
  String get anteMeridiemAbbreviation => 'AM';

  @override
  String get postMeridiemAbbreviation => 'PM';

  @override
  String get alertDialogLabel => 'Info';

  @override
  String timerPickerHour(int hour) => hour.toString();

  @override
  String timerPickerMinute(int minute) => minute.toString();

  @override
  String timerPickerSecond(int second) => second.toString();

  @override
  String timerPickerHourLabel(int hour) => hour == 1 ? 'Stunde' : 'Stunden';

  @override
  String timerPickerMinuteLabel(int minute) => 'Min';

  @override
  String timerPickerSecondLabel(int second) => 'Sek';

  @override
  String get cutButtonLabel => 'Ausschneiden';

  @override
  String get copyButtonLabel => 'Kopieren';

  @override
  String get pasteButtonLabel => 'Einfügen';

  @override
  String get selectAllButtonLabel => 'Alles auswählen';

  /// Creates an object that provides US English resource values for the
  /// cupertino library widgets.
  ///
  /// The [locale] parameter is ignored.
  ///
  /// This method is typically used to create a [LocalizationsDelegate].
  static Future<CupertinoLocalizations> load(Locale locale) {
    return SynchronousFuture<CupertinoLocalizations>(const GermanCupertinoLocalizations());
  }

  /// A [LocalizationsDelegate] that uses [DefaultCupertinoLocalizations.load]
  /// to create an instance of this class.
  static const LocalizationsDelegate<CupertinoLocalizations> delegate = _CupertinoLocalizationsDelegate();
}
导入'dart:async';
进口“包装:颤振/cupertino.dart”;
进口“包装:颤振/基础.dart”;
导入“package:flatter/widgets.dart”;
类_CupertinoLocalizationsDelegate扩展本地化sDelegate{
const_cupertinologizationsdelegate();
@凌驾
bool isSupported(Locale)=>Locale.languageCode=='de';
@凌驾
未来加载(Locale)=>GermanSupertinolocalizations.load(Locale);
@凌驾
bool应该重新加载(_cupertinologizationsdelegateold)=>false;
@凌驾
字符串toString()=>“DefaultCupertinoLocalizations.delegate(de_de)”;
}
///cupertino小部件的美英字符串。
类GermanSuperTinoLocalizations实现CupertinoLocalization{
///构造一个对象,该对象定义cupertino小部件的本地化字符串
///我们只有英语。
///
///[LocalizationsDelegate]实现通常调用静态[load]
///函数,而不是直接构造此类。
常量GermanSupertinolocalizations();
静态常量列表_短工作日=[
"莫",,
"地",,
"米",,
“做”,
“Fr”,
"Sa",,
“那么”,
];
静态常量列表_shortMonths=[
“一月”,
二月,,
“Mär”,
“四月”,
"麦",,
"六月",,
七月,,
"八月",,
"九月",,
“好的”,
十一月,,
“迪兹”,
];
静态常量列表_个月=[
“一月”,
“二月”,
“马尔兹”,
"四月",,
"麦",,
"Juni",,
"朱莉",,
“八月”,
"九月",,
“Oktober”,
"十一月",,
“Dezember”,
];
@凌驾
字符串datePickerYear(int yearIndex)=>yearIndex.toString();
@凌驾
字符串datePickerMonth(int-monthIndex)=>\u个月[monthIndex-1];
@凌驾
字符串datePickerDayOfMonth(int dayIndex)=>dayIndex.toString();
@凌驾
字符串datePickerHour(整小时)=>hour.toString();
@凌驾
字符串datePickerHourSemanticsLabel(整数小时)=>hour.toString()+“Uhr”;
@凌驾
字符串datePickerMinute(int-minute)=>minute.toString().padLeft(2,'0');
@凌驾
字符串DatePickerMinuteManticsLabel(整数分钟){
如果(分钟==1)
返回“1分钟”;
返回minute.toString()+'Minuten';
}
@凌驾
字符串datePickerMediumDate(日期时间日期){
返回“${u shortWeekdays[date.weekday-DateTime.monday]}”
“${u shortMonths[date.month-DateTime.一月]}”
“${date.day.toString().padRight(2)}”;
}
@凌驾
DatePickerDateOrder get DatePickerDateOrder=>DatePickerDateOrder.mdy;
@凌驾
DatePickerDateTimeOrder获取DatePickerDateTimeOrder=>DatePickerDateTimeOrder.date\u time\u dayPeriod;
@凌驾
字符串get ANTEMERIDIEMABREVIATION=>AM';
@凌驾
字符串get POSTERDIEMABREVIATION=>PM';
@凌驾
字符串get-alertDialogLabel=>'Info';
@凌驾
字符串timerPickerHour(int hour)=>hour.toString();
@凌驾
字符串timerPickerMinute(int minute)=>minute.toString();
@凌驾
字符串timerPickerSecond(int second)=>second.toString();
@凌驾
字符串timerPickerHourLabel(int hour)=>hour==1?'Stunde':'Stunden';
@凌驾
字符串timerPickerMinuteLabel(int-minute)=>“Min”;
@凌驾
字符串timerPickerSecondLabel(整数秒)=>“Sek”;
@凌驾
字符串get cutButtonLabel=>Ausschneiden';
@凌驾
字符串get copyButtonLabel=>Kopieren';
@凌驾
字符串get pasteButtonLabel=>Einfügen';
@凌驾
字符串get-selectAllButtonLabel=>“Alles auswählen”;
///创建一个对象,该对象向我们提供
///cupertino库小部件。
///
///忽略[locale]参数。
///
///此方法通常用于创建[LocalizationsDelegate]。
静态未来加载(区域设置){
返回SynchronousFuture(const GermanSupertinolocalizations());
}
///使用[DefaultCupertinoLocalizations.load]的[LocalizationsDelegate]
///创建此类的实例。
static const LocalizationsDelegate委托=_cupertinologizationsdelegate();
}

我已经找到了问题的解决方案,必须向本地化数据包添加回退,如下所示:

localizationsDelegates: [ ..... const FallbackCupertinoLocalisationsDelegate(), ]
代表:

class FallbackCupertinoLocalisationsDelegate extends LocalizationsDelegate {
    const FallbackCupertinoLocalisationsDelegate();

    @override
    bool isSupported(Locale locale) => true;

    @override
    Future load(Locale locale) =>
    DefaultCupertinoLocalizations.load(locale);

    @override
    bool shouldReload(FallbackCupertinoLocalisationsDelegate old) => false;
    }

首先,您应该将其添加到pubspec.yaml中

flutter_cupertino_localizations: ^1.0.1

flutter_localizations: 
  sdk: flutter
MaterialApp(
...
本地化授权:[
GlobalMaterialAllocalizations.delegate,
GlobalWidgetsLocalizations.delegate,
GlobalSuperTinoLocalizations.delegate,
]
)


这就解决了问题。

不,你不需要所有这些工作。只需添加您的特定本地化,日期选择器将始终像您的Localeflutter\u cupertino\u本地化是正确的解决方案,请检查@malibayram91答案
flutter_cupertino_localizations: ^1.0.1

flutter_localizations: 
  sdk: flutter