Flutter国家选择器插件country_picker_flutter的使用
Flutter国家选择器插件country_picker_flutter的使用
country_picker_flutter
是一个用于在 Flutter 应用程序中展示国家代码选择器的插件。它支持70种语言的国际化。
示例图片
使用方法
首先,你需要将 CountryCodePicker
组件添加到你的应用中,并设置 onChanged
回调。
import 'package:country_picker_flutter/country_code_picker.dart';
import 'package:flutter/material.dart';
import 'dart:developer';
@override
Widget build(BuildContext context) => new Scaffold(
body: Center(
child: CountryCodePicker(
onChanged: print,
// 初始选择和收藏可以是国家代码('IT')或区号('+39')
initialSelection: 'IT',
favorite: ['+39','PK'],
// 只显示国家名称和旗帜
showCountryOnly: false,
// 关闭时只显示国家名称和旗帜
showOnlyCountryWhenClosed: false,
// 将旗帜和文本对齐到左侧
alignLeft: false,
),
),
);
示例代码
以下是一个完整的示例,展示了如何在应用程序中使用 CountryCodePicker
:
import 'package:country_picker_flutter/country_code_picker.dart';
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => new _MyAppState();
}
class _MyAppState extends State<MyApp> {
@override
Widget build(BuildContext context) {
return new MaterialApp(
home: new Scaffold(
appBar: new AppBar(
title: const Text('CountryPicker Example'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
CountryCodePicker(
onChanged: print,
// 初始选择和收藏可以是国家代码('IT')或区号('+39')
initialSelection: 'IT',
favorite: ['+39', 'FR'],
countryFilter: ['IT', 'FR'],
showFlagDialog: false,
comparator: (a, b) => b.name!.compareTo(a.name!),
// 获取初始选择的国家信息
onInit: (code) => print("on init ${code!.name} ${code.dialCode} ${code.name}"),
),
CountryCodePicker(
onChanged: print,
// 初始选择和收藏可以是国家代码('IT')或区号('+39')
initialSelection: 'IT',
favorite: ['+39', 'FR'],
countryFilter: ['IT', 'FR'],
// 标志可以通过 BoxDecoration 的 `borderRadius` 和 `shape` 字段进行样式设置
flagDecoration: BoxDecoration(
borderRadius: BorderRadius.circular(7),
),
),
SizedBox(
width: 400,
height: 60,
child: CountryCodePicker(
onChanged: print,
hideMainText: true,
showFlagMain: true,
showFlag: false,
initialSelection: 'TF',
hideSearch: true,
showCountryOnly: true,
showOnlyCountryWhenClosed: true,
alignLeft: true,
),
),
SizedBox(
width: 400,
height: 60,
child: CountryCodePicker(
onChanged: (e) => print(e.toLongString()),
initialSelection: 'TF',
showCountryOnly: true,
showOnlyCountryWhenClosed: true,
favorite: ['+39', 'FR'],
),
),
SizedBox(
width: 100,
height: 60,
child: CountryCodePicker(
enabled: false,
onChanged: (c) => c.name,
initialSelection: 'TF',
showCountryOnly: true,
showOnlyCountryWhenClosed: true,
favorite: ['+39', 'FR'],
),
),
],
),
),
),
);
}
}
国际化(i18n)
要启用国际化功能,只需将 CountryLocalizations.delegate
添加到应用的委托列表中:
return new MaterialApp(
supportedLocales: [
Locale("af"),
Locale("am"),
Locale("ar"),
Locale("az"),
Locale("be"),
Locale("bg"),
Locale("bn"),
Locale("bs"),
Locale("ca"),
Locale("cs"),
Locale("da"),
Locale("de"),
Locale("el"),
Locale("en"),
Locale("es"),
Locale("et"),
Locale("fa"),
Locale("fi"),
Locale("fr"),
Locale("gl"),
Locale("ha"),
Locale("he"),
Locale("hi"),
Locale("hr"),
Locale("hu"),
Locale("hy"),
Locale("id"),
Locale("is"),
Locale("it"),
Locale("ja"),
Locale("ka"),
Locale("kk"),
Locale("km"),
Locale("ko"),
Locale("ku"),
Locale("ky"),
Locale("lt"),
Locale("lv"),
Locale("mk"),
Locale("ml"),
Locale("mn"),
Locale("ms"),
Locale("nb"),
Locale("nl"),
Locale("nn"),
Locale("no"),
Locale("pl"),
Locale("ps"),
Locale("pt"),
Locale("ro"),
Locale("ru"),
Locale("sd"),
Locale("sk"),
Locale("sl"),
Locale("so"),
Locale("sq"),
Locale("sr"),
Locale("sv"),
Locale("ta"),
Locale("tg"),
Locale("th"),
Locale("tk"),
Locale("tr"),
Locale("tt"),
Locale("uk"),
Locale("ug"),
Locale("ur"),
Locale("uz"),
Locale("vi"),
Locale("zh")
],
localizationsDelegates: [
CountryLocalizations.delegate,
GlobalMaterialLocalizations.delegate,
GlobalWidgetsLocalizations.delegate,
],
);
更多关于Flutter国家选择器插件country_picker_flutter的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
更多关于Flutter国家选择器插件country_picker_flutter的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
当然,以下是如何在Flutter项目中使用country_picker_flutter
插件的一个详细代码示例。这个插件允许用户从列表中选择一个国家,并获取相关的国家信息,如国家代码、拨号代码等。
1. 添加依赖
首先,在你的pubspec.yaml
文件中添加country_picker_flutter
依赖:
dependencies:
flutter:
sdk: flutter
country_picker_flutter: ^0.2.0 # 请检查最新版本号
然后运行flutter pub get
来安装依赖。
2. 导入插件
在你的Dart文件中导入插件:
import 'package:flutter/material.dart';
import 'package:country_picker_flutter/country_picker.dart';
3. 使用CountryPicker
下面是一个完整的示例,展示了如何在Flutter应用中使用CountryPicker
。
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Country Picker Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: CountryPickerScreen(),
);
}
}
class CountryPickerScreen extends StatefulWidget {
@override
_CountryPickerScreenState createState() => _CountryPickerScreenState();
}
class _CountryPickerScreenState extends State<CountryPickerScreen> {
Country? selectedCountry;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Country Picker Demo'),
),
body: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
selectedCountry != null
? '${selectedCountry!.name} (+${selectedCountry!.phoneCode})'
: 'Select a country',
style: TextStyle(fontSize: 20),
),
SizedBox(height: 20),
ElevatedButton(
onPressed: () async {
final result = await showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: Text('Select a country'),
content: SingleChildScrollView(
child: CountryPicker(
onChanged: (Country country) {
setState(() {
selectedCountry = country;
});
},
favorite: ['+1', 'cn', 'in'], // 可选:设置默认显示的“收藏”国家代码
search: true, // 可选:启用搜索功能
),
),
actions: <Widget>[
TextButton(
onPressed: () {
Navigator.of(context).pop();
},
child: Text('Cancel'),
),
TextButton(
onPressed: () {
if (selectedCountry != null) {
Navigator.of(context).pop(selectedCountry);
}
},
child: Text('OK'),
),
],
);
},
);
// 如果用户点击了“OK”按钮,result将包含所选国家
if (result != null) {
// 这里可以进一步处理所选国家的信息
print('Selected country: ${result!.name} (+${result!.phoneCode})');
}
},
child: Text('Select Country'),
),
],
),
),
);
}
}
代码解释
- 依赖添加:在
pubspec.yaml
中添加country_picker_flutter
。 - 导入插件:在需要使用插件的Dart文件中导入
package:country_picker_flutter/country_picker.dart
。 - UI构建:
- 使用
ElevatedButton
触发对话框。 - 在对话框中使用
CountryPicker
来显示国家列表。 - 用户选择国家后,通过
onChanged
回调更新selectedCountry
状态。 - 用户点击“OK”按钮后,对话框返回所选国家对象。
- 使用
这样,你就可以在Flutter应用中集成并使用country_picker_flutter
插件来选择国家并获取相关信息了。