flutter_i18next

A package to bring i18next support for Flutter! This is heavily based on flutter_i18n but with lots of modification and simplifications.

Usage

First, Add flutter_i18next to your pubspec.yaml:

dependencies:
  flutter_i18next: ^0.3.0

Next, Add an instance of I18NextDelegate to your app's localizationsDelegates:

MaterialApp(
  supportedLocales: [
    Locale('en'),
    Locale('fa'),
  ],
  localizationsDelegates: [
    I18NextDelegate(
      translationLoader: FileTranslationLoader(
        useCountryCode: false,
        basePath: 'assets/i18n',
      ),
    ),
    GlobalMaterialLocalizations.delegate,
    GlobalWidgetsLocalizations.delegate
  ],
)

Now you can get the translation using the extension method on BuildContext or the I18Next class directly:

I18Next.t(context, 'label.main')
//or
context.t('label.main')

Accessing Key

You can pass a normal key or a deep key with a default value and a list of fallback keys when retrieving translation:

I18Next.t(context, 'deep.key', defaultValue: 'value', fallbackKeys: ['key1', 'key2'])

Namespaces are not supported yet.

Interpolation

Only the basic interpolation from i18next is supported:

I18Next.t(context, 'key', params: {'param': 'value'})

Formatting

You can provide an instance of InterpolationOptions to handle formatting.

I18NextDelegate(
  interpolationOptions:
      InterpolationOptions(formatter: (value, format, locale) {
    if (format == 'uppercase') {
      return value.toString().toUpperCase();
    } else if (value is DateTime) {
      return DateFormat(format).format(value);
    }
    return value;
  }),
)

Plurals

Right now, it's only possible to define singular and plural key:

I18Next.t('key', count: 2)

Interval plurals and Languages with multiple plurals are not supported yet.

Locale Changing

It's also possible to use the I18NextLocaleBuilder widget provided with the plugin to handle locale changes. First you need to wrap your app inside a I18NextLocaleBuilder:

I18NextLocaleBuilder(
  defaultLocale: Locale('en'),
  builder: (context, locale) => MaterialApp(
    locale: locale,
    ...
  ),
)

Now to change the locale you can use:

I18NextLocaleBuilder.of(context).locale = Locale('en');
//or
context.locale = Locale('en');

The given locale should be in the supportedLocales of your app and your app (MaterialApp or CupertinoApp) will take care of the rest (loading translations using delegator and changing app direction).