flutter 中文本地化（长按复制、粘贴等）

第一步 在ios工程中，在项目的info设置语言环境

• Mac环境下打开Xcode，在info中设置：

• Win环境下，打开项目ios => Runner => Info.plist,把(DEVELOPMENT _ LANGUAGE)设置zh_CN

第二步 首先在pubspec.yaml的dependencies下加入

dependencies:
  flutter:
    sdk: flutter
    #国际化支持
  flutter_localizations:
    sdk: flutter

第三步 写一个类继承一下CupertinoLocalizations，在项目中我这个类名叫ChineseCupertinoLocalizations(就是localizationsDelegates中的第三个)

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 == 'zh';

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

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

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

/// US English strings for the cupertino widgets.
class ChineseCupertinoLocalizations 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.
  ChineseCupertinoLocalizations(Locale local);

  static const List<String> _shortWeekdays = <String>[
    '周一',
    '周二',
    '周三',
    '周四',
    '周五',
    '周六',
    '周日',
  ];

  static const List<String> _shortMonths = <String>[
    'Jan',
    'Feb',
    'Mar',
    'Apr',
    'May',
    'Jun',
    'Jul',
    'Aug',
    'Sep',
    'Oct',
    'Nov',
    'Dec',
  ];

  static const List<String> _months = <String>[
    '01月',
    '02月',
    '03月',
    '04月',
    '05月',
    '06月',
    '07月',
    '08月',
    '09月',
    '10月',
    '11月',
    '12月',
  ];

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

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

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

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

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

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

  @override
  String datePickerMinuteSemanticsLabel(int minute) {
    return '1 分钟';
  }

  @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.ymd;

  @override
  DatePickerDateTimeOrder get datePickerDateTimeOrder => DatePickerDateTimeOrder.date_time_dayPeriod;

  @override
  String get anteMeridiemAbbreviation => 'AM';

  @override
  String get postMeridiemAbbreviation => 'PM';

  @override
  String get alertDialogLabel => '提示信息';

  @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) => '时';

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

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

  @override
  String get cutButtonLabel => '剪切';

  @override
  String get copyButtonLabel => '复制';

  @override
  String get pasteButtonLabel => '粘贴';

  @override
  String get selectAllButtonLabel => '全选';

  /// 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>(ChineseCupertinoLocalizations(locale));
  }

  /// A [LocalizationsDelegate] that uses [DefaultCupertinoLocalizations.load]
  /// to create an instance of this class.
  static const LocalizationsDelegate<CupertinoLocalizations> delegate = _CupertinoLocalizationsDelegate();

  @override
  // TODO: implement todayLabel
  String get todayLabel => null;
}

第四步 在main的文件中添加

List<Locale> an = [
  const Locale('zh', 'CH'),
  const Locale('en', 'US'),
];
List<Locale> ios = [
  const Locale('en', 'US'),
  const Locale('zh', 'CH'),
];
void main() {
  runApp(MaterialApp(
    title: '点赞哦！！！！',
    // 国际化支持
    localizationsDelegates: [
      GlobalMaterialLocalizations.delegate,
      GlobalWidgetsLocalizations.delegate,
      ChineseCupertinoLocalizations.delegate,
    ],
    supportedLocales: Platform.isIOS ? ios : an,

到这里就重新启动你的项目吧！完成咯！

随手点赞👍好习惯！！感谢支持！