[英]how to pass index inside Radio listTile in Flutter?
I am trying to pass the index inside the Radio button list tile in order to set Locale language and also save settings into shared preferences.我正在尝试在单选按钮列表磁贴中传递索引,以设置区域设置语言并将设置保存到共享首选项中。
This is a the part of main code where i want to pass the index:这是我要传递索引的主要代码的一部分:
body: CupertinoPageScaffold(
child: Container(
child: SingleChildScrollView(
child: Container(
child: CupertinoFormSection.insetGrouped(
header: Text('choose_a_language'.tr()),
children: [
RadioListTile( title: Text('English'), value: Language.English, groupValue: _selecLangIndex, subtitle: Text('English'), selected: _selectedIndex == 0 , onChanged: (newValue) =>
setState(() => _selecIndex = newValue)),
RadioListTile(title: Text('French'), value: Language.French, groupValue: _selecLangIndex, subtitle: Text('French'), selected: _selectedIndex == 1, onChanged: (newValue) =>
setState(() => _selecIndex = newValue)),
RadioListTile(title: Text('Italian'), value: Language.Italian, groupValue: _selecLangIndex, subtitle: Text('Italian'), selected: _selectedIndex == 2, onChanged: (newValue) =>
setState(() => _selecIndex = newValue)),
TextButton(onPressed:
_saveSettings,
child: Text('save'.tr().toUpperCase(),
style: TextStyle(fontWeight: FontWeight.bold),),
Right now on Save button
, with onPressed method, i am able to save settings, but i cannot set locale language.现在在
Save button
上,使用 onPressed 方法,我可以保存设置,但我无法设置语言环境。 I also tried to implement this code, without any result.我也尝试实现此代码,但没有任何结果。
void setLocale() {
int index = 0;
setState(() => _selectedIndex == index );
if (index == 0){
context.setLocale(Locale('en','US'));
}
else if (index == 1){
context.setLocale(Locale('fr','FR'));
}
else if (index == 2){
context.setLocale(Locale('it','IT'));
}
print(index);
}
You can do something like this你可以做这样的事情
onChanged: (newValue) {
setLocale(); //
_selecIndex = newValue ;
setState((){});
},
If your setLocale
is not using/updating the _selectedIndex
.如果您的
setLocale
没有使用/更新_selectedIndex
。 You can pass index on setLocale(0)
and it doesnt need to have setState because we already call setState end of onChanged
您可以在
setLocale(0)
上传递索引,它不需要 setState 因为我们已经调用了onChanged
的 setState end
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