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return Column(
children: <Widget>[
...
// Returns 'no wombats'
Text(AppLocalizations.of(context)!.nWombats(0)),
// Returns '1 wombat'
Text(AppLocalizations.of(context)!.nWombats(1)),
// Returns '5 wombats'
Text(AppLocalizations.of(context)!.nWombats(5)),
],
);<code_end>
Similar to plurals,
you can also choose a value based on a String placeholder.
This is most often used to support gendered languages.
The syntax is as follows:The next example defines a message that
selects a pronoun based on gender:
<code_start>"pronoun": "{gender, select, male{he} female{she} other{they}}",
"@pronoun": {
"description": "A gendered message",
"placeholders": {
"gender": {
"type": "String"
}
}
}<code_end>
Use this feature by
passing the gender string as a parameter:
<code_start>// Examples of internationalized strings.
return Column(
children: <Widget>[
...
// Returns 'he'
Text(AppLocalizations.of(context)!.pronoun('male')),
// Returns 'she'
Text(AppLocalizations.of(context)!.pronoun('female')),
// Returns 'they'
Text(AppLocalizations.of(context)!.pronoun('other')),
],
);<code_end>
Keep in mind that when using select statements,
comparison between the parameter and the actual
value is case-sensitive.
That is, AppLocalizations.of(context)!.pronoun("Male")
defaults to the “other” case, and returns “they”.<topic_end>
<topic_start>
Escaping syntax
Sometimes, you have to use tokens,
such as { and }, as normal characters.
To ignore such tokens from being parsed,
enable the use-escaping flag by adding the
following to l10n.yaml:The parser ignores any string of characters
wrapped with a pair of single quotes.
To use a normal single quote character,
use a pair of consecutive single quotes.
For example, the follow text is converted
to a Dart String:The resulting string is as follows:<topic_end>
<topic_start>
Messages with numbers and currencies
Numbers, including those that represent currency values,
are displayed very differently in different locales.
The localizations generation tool in
flutter_localizations uses the
NumberFormat
class in the intl package to format
numbers based on the locale and the desired format.The int, double, and number types can use any of the
following NumberFormat constructors:The starred NumberFormat constructors in the table
offer optional, named parameters.
Those parameters can be specified as the value
of the placeholder’s optionalParameters object.
For example, to specify the optional decimalDigits
parameter for compactCurrency,
make the following changes to the lib/l10n/app_en.arg file:
<code_start>"numberOfDataPoints": "Number of data points: {value}",
"@numberOfDataPoints": {
"description": "A message with a formatted int parameter",
"placeholders": {
"value": {
"type": "int",
"format": "compactCurrency",
"optionalParameters": {
"decimalDigits": 2
}
}
}
}<code_end>
<topic_end>
<topic_start>
Messages with dates
Dates strings are formatted in many different ways
depending both the locale and the app’s needs.Placeholder values with type DateTime are formatted with
DateFormat in the intl package.There are 41 format variations,
identified by the names of their DateFormat factory constructors.
In the following example, the DateTime value
that appears in the helloWorldOn message is
formatted with DateFormat.yMd:In an app where the locale is US English,
the following expression would produce “7/9/1959”.
In a Russian locale, it would produce “9.07.1959”.<topic_end>
<topic_start>
Localizing for iOS: Updating the iOS app bundle
Typically, iOS applications define key application metadata,