Flutter文本表单封装插件text_form_field_wrapper的使用
Flutter文本表单封装插件text_form_field_wrapper的使用
text_form_field_wrapper
是一个用于装饰 TextFormField
的 Flutter 插件,它提供了带有边框和圆角的功能,并且可以轻松调整这些属性,适用于需要放置在一起的 TextFormFields
。
安装
在你的 Flutter 项目的 pubspec.yaml
文件中添加以下依赖:
dependencies:
text_form_field_wrapper: ^1.0.0
然后导入到你使用的每个文件中:
import 'package:text_form_field_wrapper/text_form_field_wrapper.dart';
使用
示例 1:基本用法
这是一个非常基础的、独立的 TextFormFieldWrapper
示例:
TextEditingController myController = TextEditingController();
TextFormFieldWrapper(
formField: TextFormField(
controller: myController,
decoration: const InputDecoration(
border: InputBorder.none),
),
position: TextFormFieldPosition.alone,
),
示例 2:复杂布局
这个示例展示了如何在一个列中放置一个文本字段,在该列下方有两个并排的文本字段:
TextEditingController myController1 = TextEditingController();
TextEditingController myController2 = TextEditingController();
TextEditingController myController3 = TextEditingController();
Column(children: [
TextFormFieldWrapper(
formField: TextFormField(
controller: myController1,
decoration: const InputDecoration(
border: InputBorder.none),
),
position: TextFormFieldPosition.top,
),
Row(children: [
Expanded(child: TextFormFieldWrapper(
formField: TextFormField(
controller: myController2,
decoration: const InputDecoration(
border: InputBorder.none),
),
position: TextFormFieldPosition.bottomLeft,
)),
Expanded(child: TextFormFieldWrapper(
formField: TextFormField(
controller: myController3,
decoration: const InputDecoration(
border: InputBorder.none),
),
position: TextFormFieldPosition.bottomRight,
)),
]),
]),
完整示例 Demo
下面是一个完整的示例代码,展示了如何在实际应用中使用 text_form_field_wrapper
插件:
import 'package:flutter/material.dart';
import 'package:text_form_field_wrapper/text_form_field_wrapper.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(primarySwatch: Colors.blue),
home: const MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key}) : super(key: key);
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
TextFormField formField = TextFormField(
initialValue: '',
decoration: const InputDecoration(border: InputBorder.none),
);
return Scaffold(
appBar: AppBar(
title: const Text('Text Form Field Wrapper'),
),
body: SafeArea(
child: Center(
child: SingleChildScrollView(
child: Container(
constraints: const BoxConstraints(maxWidth: 600),
padding: const EdgeInsets.symmetric(horizontal: 16),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
const SizedBox(height: 20),
// Standalone field with no suffix or prefix
const Padding(
padding: EdgeInsets.symmetric(horizontal: 12.0, vertical: 4.0),
child: Text('Standalone field with no suffix or prefix'),
),
TextFormFieldWrapper(
formField: formField,
position: TextFormFieldPosition.alone,
),
const SizedBox(height: 20),
// Standalone field with prefix only
const Padding(
padding: EdgeInsets.symmetric(horizontal: 12.0, vertical: 4.0),
child: Text('Standalone field with prefix only'),
),
TextFormFieldWrapper(
formField: formField,
position: TextFormFieldPosition.alone,
prefix: const Text('Prefix'),
),
const SizedBox(height: 20),
// Standalone field with suffix only
const Padding(
padding: EdgeInsets.symmetric(horizontal: 12.0, vertical: 4.0),
child: Text('Standalone field with suffix only'),
),
TextFormFieldWrapper(
formField: formField,
position: TextFormFieldPosition.alone,
suffix: const Text('Suffix'),
),
const SizedBox(height: 20),
// Standalone field with prefix and suffix
const Padding(
padding: EdgeInsets.symmetric(horizontal: 12.0, vertical: 4.0),
child: Text('Standalone field with prefix and suffix'),
),
TextFormFieldWrapper(
formField: formField,
position: TextFormFieldPosition.alone,
prefix: const Text('Prefix'),
suffix: const Text('Suffix'),
),
const SizedBox(height: 20),
// Two fields side by side
const Padding(
padding: EdgeInsets.symmetric(horizontal: 12.0, vertical: 4.0),
child: Text('Two fields side by side'),
),
Row(
children: [
Expanded(
child: TextFormFieldWrapper(
formField: formField,
position: TextFormFieldPosition.left,
),
),
Expanded(
child: TextFormFieldWrapper(
formField: formField,
position: TextFormFieldPosition.right,
),
),
],
),
const SizedBox(height: 20),
// Multiple fields stacked on top of another
const Padding(
padding: EdgeInsets.symmetric(horizontal: 12.0, vertical: 4.0),
child: Text('Multiple fields stacked on top of another'),
),
Column(
children: [
TextFormFieldWrapper(
formField: formField,
position: TextFormFieldPosition.top,
),
TextFormFieldWrapper(
formField: formField,
position: TextFormFieldPosition.center,
),
TextFormFieldWrapper(
formField: formField,
position: TextFormFieldPosition.bottom,
),
],
),
const SizedBox(height: 20),
// Collection of textfields to mimic credit card input
const Padding(
padding: EdgeInsets.symmetric(horizontal: 12.0, vertical: 4.0),
child: Text('Collection of textfields to mimic credit card input'),
),
Column(
children: [
TextFormFieldWrapper(
formField: TextFormField(
initialValue: '',
textAlign: TextAlign.center,
decoration: const InputDecoration(
hintText: '1234 1234 1234 1234',
hintStyle: TextStyle(letterSpacing: 6, fontSize: 18),
border: InputBorder.none),
),
position: TextFormFieldPosition.top,
suffix: const Icon(Icons.credit_card),
),
Row(
children: [
Expanded(
child: TextFormFieldWrapper(
formField: TextFormField(
initialValue: '',
textAlign: TextAlign.center,
decoration: const InputDecoration(
hintText: 'MM/YY',
hintStyle: TextStyle(letterSpacing: 6, fontSize: 18),
border: InputBorder.none),
),
position: TextFormFieldPosition.bottomLeft,
),
),
Expanded(
child: TextFormFieldWrapper(
formField: TextFormField(
initialValue: '',
textAlign: TextAlign.center,
decoration: const InputDecoration(
hintText: 'CVV',
hintStyle: TextStyle(letterSpacing: 6, fontSize: 18),
border: InputBorder.none),
),
position: TextFormFieldPosition.bottomRight,
),
),
],
),
const SizedBox(height: 80),
],
),
],
),
),
),
),
),
);
}
}
这个示例展示了如何在不同的布局中使用 TextFormFieldWrapper
,包括单独的字段、带有前缀或后缀的字段、并排的字段以及堆叠的字段。你可以根据自己的需求进行修改和扩展。
更多关于Flutter文本表单封装插件text_form_field_wrapper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文本表单封装插件text_form_field_wrapper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,下面是一个关于如何使用 text_form_field_wrapper
插件的 Flutter 代码示例。这个插件可以帮助你更轻松地封装和重用文本表单字段。假设你已经将这个插件添加到了你的 pubspec.yaml
文件中:
dependencies:
flutter:
sdk: flutter
text_form_field_wrapper: ^最新版本号
然后,你可以在你的 Flutter 应用中这样使用它:
import 'package:flutter/material.dart';
import 'package:text_form_field_wrapper/text_form_field_wrapper.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final _formKey = GlobalKey<FormState>();
String _username = '';
String _email = '';
void _submit() {
if (_formKey.currentState!.validate()) {
_formKey.currentState!.save();
print('Username: $_username');
print('Email: $_email');
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Text Form Field Wrapper Demo'),
),
body: Padding(
padding: const EdgeInsets.all(16.0),
child: Form(
key: _formKey,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
TextFormFieldWrapper(
labelText: 'Username',
validator: (value) {
if (value == null || value.isEmpty) {
return 'Username is required';
}
return null;
},
onSaved: (value) {
_username = value!;
},
),
SizedBox(height: 16),
TextFormFieldWrapper(
labelText: 'Email',
validator: (value) {
if (value == null || value.isEmpty) {
return 'Email is required';
}
if (!value!.contains('@')) {
return 'Invalid email address';
}
return null;
},
onSaved: (value) {
_email = value!;
},
keyboardType: TextInputType.emailAddress,
),
SizedBox(height: 24),
ElevatedButton(
onPressed: _submit,
child: Text('Submit'),
),
],
),
),
),
);
}
}
在这个示例中,我们做了以下几件事:
- 引入必要的包:引入了
flutter
和text_form_field_wrapper
包。 - 定义表单状态:使用
GlobalKey<FormState>
来管理表单状态,并定义了两个字符串变量_username
和_email
来保存表单数据。 - 创建表单:使用
Form
组件,并在其中使用TextFormFieldWrapper
封装了两个文本字段,一个用于用户名,一个用于电子邮件。 - 验证和保存数据:为每个文本字段提供了验证器和保存回调。验证器用于检查输入是否有效,保存回调用于在验证通过后保存输入数据。
- 提交按钮:在表单下方添加了一个
ElevatedButton
,点击按钮时调用_submit
方法来验证和提交表单。
请注意,你需要确保 text_form_field_wrapper
插件已经正确安装,并且你使用的是最新版本。如果插件的 API 有所变化,请查阅最新的文档以获取更新信息。