Flutter密码输入插件reactive_fancy_password_field的使用
Flutter密码输入插件reactive_fancy_password_field的使用
reactive_fancy_password_field 是一个用于在 Flutter 应用中处理密码输入的插件。它结合了 fancy_password_field 和 reactive_forms 的功能，使得密码输入更加直观和安全。
安装
首先，在你的 pubspec.yaml 文件中添加依赖：
dependencies:
reactive_fancy_password_field: ^版本号
reactive_forms: ^版本号
然后运行 flutter pub get 来安装这些依赖。
使用示例
以下是一个完整的示例，展示了如何在 Flutter 应用中使用 reactive_fancy_password_field 插件。
示例代码
import 'package:flutter/material.dart';
import 'package:reactive_fancy_password_field/reactive_fancy_password_field.dart';
import 'package:reactive_forms/reactive_forms.dart';
import 'package:step_progress_indicator/step_progress_indicator.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
// 构建表单
FormGroup buildForm() => fb.group({
'input': FormControl<String>(),
});
// 根据强度返回进度条的当前步骤
int getStep(double strength) {
if (strength == 0) {
return 0;
} else if (strength < .1) {
return 1;
} else if (strength < .2) {
return 2;
} else if (strength < .3) {
return 3;
} else if (strength < .4) {
return 4;
} else if (strength < .5) {
return 5;
} else if (strength < .6) {
return 6;
} else if (strength < .7) {
return 7;
}
return 8;
}
// 根据强度返回颜色
Color? getColor(double strength) {
if (strength == 0) {
return Colors.grey[300];
} else if (strength < .1) {
return Colors.red;
} else if (strength < .2) {
return Colors.red;
} else if (strength < .3) {
return Colors.yellow;
} else if (strength < .4) {
return Colors.yellow;
} else if (strength < .5) {
return Colors.yellow;
} else if (strength < .6) {
return Colors.green;
} else if (strength < .7) {
return Colors.green;
}
return Colors.green;
}
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: Scaffold(
body: SafeArea(
child: SingleChildScrollView(
physics: const BouncingScrollPhysics(),
padding: const EdgeInsets.symmetric(
horizontal: 20.0,
vertical: 20.0,
),
child: ReactiveFormBuilder(
form: buildForm,
builder: (context, form, child) {
return Column(
children: [
// 密码输入字段
ReactiveFancyPasswordField<String>(
formControlName: 'input',
decoration: const InputDecoration(
prefixIcon: Icon(Icons.lock),
border: OutlineInputBorder(),
hintText: 'Password',
),
validationRules: {
UppercaseValidationRule(), // 大写字母验证规则
LowercaseValidationRule(), // 小写字母验证规则
DigitValidationRule(), // 数字验证规则
SpecialCharacterValidationRule(), // 特殊字符验证规则
MinCharactersValidationRule(6), // 最小字符数验证规则
},
strengthIndicatorBuilder: (strength) {
return Padding(
padding: const EdgeInsets.symmetric(vertical: 8),
child: StepProgressIndicator(
totalSteps: 8,
currentStep: getStep(strength),
selectedColor: getColor(strength)!,
unselectedColor: Colors.grey[300]!,
),
);
},
validationRuleBuilder: (rules, value) {
return Wrap(
runSpacing: 8,
spacing: 4,
children: rules.map(
(rule) {
final ruleValidated = rule.validate(value);
return Chip(
label: Row(
mainAxisSize: MainAxisSize.min,
children: [
if (ruleValidated) ...[
const Icon(
Icons.check,
color: Color(0xFF0A9471),
),
const SizedBox(width: 8),
],
Text(
rule.name,
style: TextStyle(
color: ruleValidated
? const Color(0xFF0A9471)
: const Color(0xFF9A9FAF),
),
),
],
),
backgroundColor: ruleValidated
? const Color(0xFFD0F7ED)
: const Color(0xFFF4F5F6),
);
},
).toList(),
);
},
),
const SizedBox(height: 16),
// 注册按钮
ElevatedButton(
child: const Text('Sign Up'),
onPressed: () {
if (form.valid) {
// 忽略：打印表单值
print(form.value);
} else {
form.markAllAsTouched();
}
},
),
],
);
},
),
),
),
),
);
}
}
代码解释
-
导入库：
import 'package:flutter/material.dart'; import 'package:reactive_fancy_password_field/reactive_fancy_password_field.dart'; import 'package:reactive_forms/reactive_forms.dart'; import 'package:step_progress_indicator/step_progress_indicator.dart'; -
构建表单：
FormGroup buildForm() => fb.group({ 'input': FormControl<String>(), }); -
根据强度返回进度条的当前步骤：
int getStep(double strength) { if (strength == 0) { return 0; } else if (strength < .1) { return 1; } else if (strength < .2) { return 2; } else if (strength < .3) { return 3; } else if (strength < .4) { return 4; } else if (strength < .5) { return 5; } else if (strength < .6) { return 6; } else if (strength < .7) { return 7; } return 8; } -
根据强度返回颜色：
Color? getColor(double strength) { if (strength == 0) { return Colors.grey[300]; } else if (strength < .1) { return Colors.red; } else if (strength < .2) { return Colors.red; } else if (strength < .3) { return Colors.yellow; } else if (strength < .4) { return Colors.yellow; } else if (strength < .5) { return Colors.yellow; } else if (strength < .6) { return Colors.green; } else if (strength < .7) { return Colors.green; } return Colors.green; } -
构建应用主界面：
[@override](/user/override) Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: Colors.blue, visualDensity: VisualDensity.adaptivePlatformDensity, ), home: Scaffold( body: SafeArea( child: SingleChildScrollView( physics: const BouncingScrollPhysics(), padding: const EdgeInsets.symmetric( horizontal: 20.0, vertical: 20.0, ), child: ReactiveFormBuilder( form: buildForm, builder: (context, form, child) { return Column( children: [ ReactiveFancyPasswordField<String>( formControlName: 'input', decoration: const InputDecoration( prefixIcon: Icon(Icons.lock), border: OutlineInputBorder(), hintText: 'Password', ), validationRules: { UppercaseValidationRule(), LowercaseValidationRule(), DigitValidationRule(), SpecialCharacterValidationRule(), MinCharactersValidationRule(6), }, strengthIndicatorBuilder: (strength) { return Padding( padding: const EdgeInsets.symmetric(vertical: 8), child: StepProgressIndicator( totalSteps: 8, currentStep: getStep(strength), selectedColor: getColor(strength)!, unselectedColor: Colors.grey[300]!, ), ); }, validationRuleBuilder: (rules, value) { return Wrap( runSpacing: 8, spacing: 4, children: rules.map( (rule) { final ruleValidated = rule.validate(value); return Chip( label: Row( mainAxisSize: MainAxisSize.min, children: [ if (ruleValidated) ...[ const Icon( Icons.check, color: Color(0xFF0A9471), ), const SizedBox(width: 8), ], Text( rule.name, style: TextStyle( color: ruleValidated ? const Color(0xFF0A9471) : const Color(0xFF9A9FAF), ), ), ], ), backgroundColor: ruleValidated ? const Color(0xFFD0F7ED) : const Color(0xFFF4F5F6), ); }, ).toList(), ); }, ), const SizedBox(height: 16), ElevatedButton( child: const Text('Sign Up'), onPressed: () { if (form.valid) { // 忽略：打印表单值 print(form.value); } else { form.markAllAsTouched(); } }, ), ], ); }, ), ), ), ), ); }
更多关于Flutter密码输入插件reactive_fancy_password_field的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html
1 回复
更多关于Flutter密码输入插件reactive_fancy_password_field的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
reactive_fancy_password_field 是一个 Flutter 插件，用于处理密码输入的表单字段。它是基于 reactive_forms 包的扩展，提供了密码输入的相关功能，如密码可见性切换、密码强度验证等。
安装
首先，你需要在 pubspec.yaml 文件中添加依赖：
dependencies:
reactive_forms: ^10.0.0
reactive_fancy_password_field: ^1.0.0
然后运行 flutter pub get 来安装依赖。
基本使用
以下是一个简单的示例，展示如何使用 reactive_fancy_password_field：
import 'package:flutter/material.dart';
import 'package:reactive_forms/reactive_forms.dart';
import 'package:reactive_fancy_password_field/reactive_fancy_password_field.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: Text('Reactive Fancy Password Field Example')),
body: PasswordForm(),
),
);
}
}
class PasswordForm extends StatelessWidget {
final form = FormGroup({
'password': FormControl<String>(validators: [Validators.required]),
});
@override
Widget build(BuildContext context) {
return ReactiveForm(
formGroup: form,
child: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
children: <Widget>[
ReactiveFancyPasswordField(
formControlName: 'password',
decoration: InputDecoration(labelText: 'Password'),
validationMessages: {
ValidationMessage.required: (error) => 'The password must not be empty',
},
),
const SizedBox(height: 20),
ElevatedButton(
child: Text('Submit'),
onPressed: () {
if (form.valid) {
print('Form is valid');
print('Password: ${form.control('password').value}');
} else {
print('Form is invalid');
}
},
),
],
),
),
);
}
}
主要功能
-
密码可见性切换：默认情况下，密码字段会显示一个眼睛图标，点击图标可以切换密码的可见性。
-
密码强度验证：你可以通过
strengthChecker参数来添加密码强度验证逻辑。 -
自定义装饰：你可以通过
decoration参数自定义输入框的装饰，如标签、提示文本等。 -
验证消息：你可以通过
validationMessages参数自定义验证错误消息。
自定义密码强度验证
你可以通过 strengthChecker 参数来添加自定义的密码强度验证逻辑。例如：
ReactiveFancyPasswordField(
formControlName: 'password',
decoration: InputDecoration(labelText: 'Password'),
strengthChecker: (value) {
if (value.length < 8) {
return 'Password must be at least 8 characters long';
}
return null; // 返回 null 表示密码强度足够
},
validationMessages: {
ValidationMessage.required: (error) => 'The password must not be empty',
},
),