Flutter多功能工具插件multiutillib的使用

发布于 1周前 作者 yuanlaile 来自 Flutter

Flutter多功能工具插件multiutillib的使用

multiutillib 是一个用于帮助处理实用工具、动画和一些预构建小部件的 Flutter 包。某些小部件具有默认值以便直接使用，并且可以根据您的需求进行自定义。

此包使用了以下依赖项：

  1. intl
  2. shimmer
  3. device_info
  4. url_launcher
  5. package_info
  6. simple_animations
  7. connectivity_plus
  8. loading_animation_widget

示例代码

import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:loading_animation_widget/loading_animation_widget.dart';
import 'package:multiutillib/multiutillib.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: const MyHomePage(),
      title: 'multiutillib Example',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(primarySwatch: Colors.blue, visualDensity: VisualDensity.adaptivePlatformDensity),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  MyHomePageState createState() => MyHomePageState();
}

class MyHomePageState extends State<MyHomePage> with SingleTickerProviderStateMixin {
  late final AnimationController _animationController;
  final TextEditingController _textEditingController = TextEditingController();

  String _isValid = '* Email Id is required.';

  @override
  void initState() {
    super.initState();

    _animationController = AnimationController(vsync: this, duration: const Duration(seconds: 1));
    _animationController.forward();

    _textEditingController.addListener(() {
      final isEmailValid = emailValidator(_textEditingController.value.text);

      if (isEmailValid != _isValid) {
        setState(() => _isValid = isEmailValid!);
      }
    });

    // _showProgressDialog();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.grey[300],
      appBar: AppBar(title: const Text('Multi Util Lib')),
      body: ConnectivityBuilder(
        builder: (isOnline) {
          return MaterialCard(
            borderRadius: 15,
            margin: const EdgeInsets.all(15),
            child: SingleChildScrollView(
              child: Column(
                children: <Widget>[
                  const SizedBox(height: 10),
                  CustomToggleButton(
                    textOn: 'On',
                    textOff: 'Off',
                    onChanged: (value) => debugPrint(value),
                  ),
                  const SizedBox(height: 10),
                  FadeAnimation(
                    delay: 1.5,
                    child: Container(height: 100, color: Colors.black12, width: double.infinity),
                  ),
                  const SizedBox(height: 10),
                  LoadingAnimationWidget.inkDrop(color: Colors.blue, size: 36),
                  const SizedBox(height: 10),
                  Text('Get Current Date: ${getCurrentDate()}'),
                  const SizedBox(height: 10),
                  Text(
                    '${'Get Current Date in $kDateDisplayFormat Format: \n'}${getCurrentDate(newDateTimeFormat: kDateDisplayFormat)}',
                    textAlign: TextAlign.center,
                  ),
                  const SizedBox(height: 10),
                  Text(
                    '${'Get Current Date in $kFullMonthYearFormat Format: \n'}${getCurrentDate(newDateTimeFormat: kFullMonthYearFormat)}',
                    textAlign: TextAlign.center,
                  ),
                  const SizedBox(height: 10),
                  Text(
                    '${'Get Current Date in $kFullDateDisplayFormat Format: \n'}${getCurrentDate(newDateTimeFormat: kFullDateDisplayFormat)}',
                    textAlign: TextAlign.center,
                  ),
                  const SizedBox(height: 10),
                  Text(
                    'Format Date Time in dd-MM-yyyy format: \n${getCurrentDate().formatDateTime(newDateTimeFormat: 'dd-MM-yyyy')}',
                    textAlign: TextAlign.center,
                  ),
                  const SizedBox(height: 10),
                  Text(
                    'Formatting Date Time Object in dd-MM-yyyy format: \n${DateTime.now().formatDateTime(newDateTimeFormat: 'dd-MM-yyyy HH:mm')}',
                    textAlign: TextAlign.center,
                  ),
                  const SizedBox(height: 10),
                  Text(
                    'Convert to Date Time Object: \n${'2021-02-26 14:06:52.55'.toDateTime}',
                    textAlign: TextAlign.center,
                  ),
                  const SizedBox(height: 10),
                  Text(
                    'Convert Time of Day to String: \n${TimeOfDay.now().formatTime()}',
                    textAlign: TextAlign.center,
                  ),
                  const SizedBox(height: 10),
                  Text(
                    'Convert Time of Day String to String: \n${'14:39'.formatTime()}',
                    textAlign: TextAlign.center,
                  ),
                  const SizedBox(height: 10),
                  Text(
                    'Convert Time String to Time of Day: \n${'14:39'.toTimeOfDay}',
                    textAlign: TextAlign.center,
                  ),
                  const SizedBox(height: 10),
                  Text(
                    'Convert DateTime to Time of Day: \n${DateTime.now().toTimeOfDay}',
                    textAlign: TextAlign.center,
                  ),
                  const SizedBox(height: 10),
                  Text(
                    "Convert DateTime to String: \n${DateTime.now().formatDateTime()}",
                    textAlign: TextAlign.center,
                  ),
                  const SizedBox(height: 10),
                  Text('Replace Null With Empty: ${"null".replaceNullWithEmpty}'),
                  const SizedBox(height: 10),
                  Text('Replace Null With Zero: ${"null".replaceNullWithZero}'),
                  const SizedBox(height: 10),
                  Text('Replace True or False: ${"true".replaceTrueOrFalse}'),
                  const SizedBox(height: 10),
                  Text('Replace Null with Double: ${"null".replaceNullWithDouble}'),
                  const SizedBox(height: 10),
                  Text('Format Number: ${"1010.869".formatNumber()}'),
                  const SizedBox(height: 10),
                  Text('Format Number to Compact: ${'88944444'.formatNumberToCompact}'),
                  const SizedBox(height: 10),
                  Text('Is Numeric: ${"1".isNumeric}'),
                  const SizedBox(height: 10),
                  Text('To Duration: ${'01:01:01'.toDuration}'),
                  const SizedBox(height: 10),
                  Text('From Duration: ${'16:35:34'.toDuration.toTimeString(newTimeString: 'mm:ss')}'),
                  const SizedBox(height: 10),
                  Text('To Two Digit: ${"9".toTwoDigits}'),
                  const SizedBox(height: 10),
                  Text('To Three Digit: ${"9".toThreeDigits}'),
                  const SizedBox(height: 10),
                  Text('To Length of String: ${'9'.toLengthOfString(5)}'),
                  const SizedBox(height: 10),
                  // [DecimalInputFormatter] will allow only entered decimal range for the string in text field
                  TextFormField(
                    inputFormatters: [DecimalInputFormatter(decimalRange: 2)],
                    decoration: const InputDecoration(labelText: 'Enter Decimal values'),
                  ),
                  const SizedBox(height: 10),
                  TextFormField(
                    // this method will validate for email id
                    validator: emailValidator,
                    controller: _textEditingController,
                    keyboardType: TextInputType.emailAddress,
                    decoration: InputDecoration(errorText: _isValid, labelText: 'Enter Email Id'),
                  ),
                  const SizedBox(height: 10),
                  FutureBuilder(
                    future: getDeviceName(),
                    builder: (context, snapshot) {
                      var formattedNumber = NumberFormat.compactCurrency(
                        symbol: '',
                        locale: 'en_IN',
                        decimalDigits: 2,
                      ).format(100000);

                      debugPrint('Formatted Number is $formattedNumber');
                      debugPrint('snapshot data is: ${snapshot.data}');

                      if (snapshot.hasData) return Text(snapshot.data!);

                      return const SizedBox.shrink();
                    },
                  ),
                  const SizedBox(height: 10),
                  FutureBuilder(
                    future: getDeviceId(),
                    builder: (context, snapshot) {
                      debugPrint('snapshot data is: ${snapshot.data}');

                      if (snapshot.hasData) return Text(snapshot.data!);

                      return const SizedBox.shrink();
                    },
                  ),
                  const SizedBox(height: 10),
                  const HyperLinkText(url: 'http://www.google.com', text: 'Open Google'),
                  DefaultButton(
                    text: 'Show Date Range Picker',
                    margin: const EdgeInsets.only(top: 10),
                    onPressed: () {
                      showCustomDateRangePicker(
                        context: context,
                        onCancelClick: () {},
                        onApplyClick: (startDate, enDate) {},
                      );
                    },
                  ),
                  DefaultButton(
                    text: 'Show Date Picker',
                    margin: const EdgeInsets.only(top: 10),
                    onPressed: () {
                      showCustomDatePicker(
                        context: context,
                        onCancelClick: () {},
                        onApplyClick: (selectedDate) {},
                      );
                    },
                  ),
                  DefaultButton(
                    text: 'Show Custom Dialog',
                    margin: const EdgeInsets.only(top: 10),
                    onPressed: () {
                      showCustomDialog(
                        context,
                        title: 'Custom Dialog',
                        btnColor: Colors.green,
                        dialogAnimationType: DialogAnimationType.fromBottom,
                        description: 'This is a test to show custom dialog',
                      );
                    },
                  ),
                  DefaultButton(
                    text: 'Show Confirmation Dialog',
                    margin: const EdgeInsets.only(top: 10),
                    onPressed: () {
                      showConfirmationDialog(
                        context,
                        dividerColor: Colors.black,
                        title: 'Confirmation Dialog',
                        positiveBtnColor: Colors.green,
                        negativeBtnColor: Colors.greenAccent,
                        onPositivePressed: () => Navigator.pop(context),
                        dialogAnimationType: DialogAnimationType.fromLeft,
                        description: 'This is a test to show confirmation dialog',
                      );
                    },
                  ),
                  DefaultButton(
                    text: 'Show Progress Dialog',
                    margin: const EdgeInsets.only(top: 10),
                    onPressed: () async {
                      // calling show progress dialog method
                      await showProgressDialog(
                        context, /*progressWidget: const CircularProgressIndicator()*/
                      );

                      await Future.delayed(const Duration(seconds: 3));

                      await hideProgressDialog();
                    },
                  ),
                  const SizedBox(height: 10),
                  const LoadingWidget(itemCount: 1),
                  OTPTextField(
                    autoFocus: false,
                    noOfOtpFields: 6,
                    onCompleted: (enteredOtp) => debugPrint('entered otp is: $enteredOtp'),
                  ),
                  const SizedBox(height: 10),
                  const RichTextWidget(
                    caption: 'Rich',
                    description: 'Text',
                    captionStyle: TextStyle(fontSize: 20, color: Colors.black),
                    descriptionStyle: TextStyle(fontSize: 24, color: Colors.black),
                  ),
                ],
              ),
            ),
          );
        },
      ),
    );
  }

  @override
  void dispose() {
    _animationController.dispose();
    _textEditingController.dispose();

    super.dispose();
  }
}

功能说明

FadeAnimation

FadeAnimation 将帮助子部件执行淡入淡出动画。

FadeAnimation(
    delay: 1,
    child: Container(),
),

SlideAnimation

SlideAnimation 将帮助子部件从顶部、左侧、右侧或底部方向执行滑动动画。

SlideAnimation(
    child: child,
    position: position,
    itemCount: itemCount,
    slideDirection: SlideDirection.fromRight,
    animationController: animationController,
),

OffsetAnimation

OffsetAnimation 将帮助子部件执行偏移动画。

OffsetAnimation(
  end: 20, // 可选参数
  animationController: _animationController, // 必需参数
  widget: YourChildWidget, // 必需参数
),

DateTimeUtils

DateTimeUtils 是一个帮助获取当前日期的实用类。

debugPrint('current date is: ${getCurrentDate()}');

Utils

Utils 是一个帮助获取设备名称、设备ID等信息的实用类。

1. getDeviceName() // 返回字符串Future
2. getDeviceId() // 返回字符串Future
3. getSingleDigitRandomNumber() // 返回单个随机数字
4. getRandomNumber(min: MinValue, max: MaxValue) // 返回在min和max值之间的随机数字
5. getRandomMobileNumber() // 返回随机生成的手机号码
6. getCharFromString(stringToExtract) // 返回传递字符串中的字符
7. getNumbersFromString(stringToExtract) // 返回传递字符串中的数字
8. getAppVersion() // 返回应用的当前版本

Extensions

扩展方法允许将一些实用方法用作扩展。

// 检查字符串、整数或双精度值是否为数字
'123'.isNumeric => 返回true
'String'.isNumeric => 返回false

// 检查字符串是否为空或空
strToCheck.isNullOrEmpty

// 去除字符串最后一个字符
stringToRemoveLastChat.trimLastChar

// 将字符串转换为两位数字
Text('To Two Digit: ${'9'.toTwoDigits}'),

// 将字符串转换为三位数字
Text('To Three Digit: ${'9'.toThreeDigits}'),

// 将字符串转换为固定长度
Text('To Length of String: ${'9'.toLengthOfString(5)}'),

// 格式化数字
Text('Format Number: ' + '1010.869'.formatNumber()),
Text('Format Number to Compact: ' + '88944444'.formatNumberToCompact), // 返回1K, 2k, 2M

Text('Replace Null With Empty: ' + 'null'.replaceNullWithEmpty),
Text('Replace True or False: ' + 'true'.replaceTrueOrFalse.toString()),
Text('Replace Null With Zero: ' + 'null'.replaceNullWithZero.toString()),
Text('Replace Null with Double: ' + 'null'.replaceNullWithDouble.toString()),
Text('Convert Duration to Time String: ' + '16:35:34'.toDuration.toTimeString(newTimeString: 'mm:ss')),

ShowConfirmationDialog

ShowConfirmationDialog 方法会显示一个确认对话框，包含两个按钮以请求确认。

showConfirmationDialog(
    BuildContext context,
    Widget transitionAnimation,
    String negativeBtnText 'No',
    String positiveBtnText: 'Yes',
    bool barrierDismissible: false,
    Color dividerColor: Colors.blue,
    Color positiveBtnColor: Colors.blue,
    Color negativeBtnColor: Colors.blueAccent,
    TextAlign descTextAlign: TextAlign.center,
    TextAlign titleTextAlign: TextAlign.center,
    Duration transitionDuration: const Duration(milliseconds: 400),
    DialogAnimationType dialogAnimationType: DialogAnimationType.grow,
    TextStyle descStyle: const TextStyle(fontSize: 16, letterSpacing: 0.27, color: Colors.black),
    TextStyle titleStyle: const TextStyle(fontSize: 18, letterSpacing: 0.27, fontWeight: FontWeight.bold),
    TextStyle positiveBtnStyle: const TextStyle(fontSize: 18, letterSpacing: 0.27, fontWeight: FontWeight.w400),
    TextStyle negativeBtnStyle: const TextStyle(fontSize: 18, letterSpacing: 0.27, fontWeight: FontWeight.w400),
    required String title,
    required String description,
    required VoidCallback onPositivePressed,
);

ShowCustomDialog

ShowCustomDialog 方法会显示一个对话框，包含一个按钮以显示警告或信息。

showCustomDialog(
  BuildContext context,
  String btnText: 'OK',
  Color btnColor: Colors.blue,
  bool barrierDismissible: false,
  Color dividerColor: Colors.blue,
  TextAlign descTextAlign: TextAlign.center,
  TextAlign titleTextAlign: TextAlign.center,
  Duration transitionDuration: const Duration(milliseconds: 400),
  DialogAnimationType dialogAnimationType: DialogAnimationType.grow,
  TextStyle descStyle: const TextStyle(fontSize: 16, letterSpacing: 0.27, color: Colors.black),
  TextStyle btnStyle: const TextStyle(fontSize: 18, letterSpacing: 0.27, fontWeight: FontWeight.w400),
  TextStyle titleStyle: const TextStyle(fontSize: 18, letterSpacing: 0.27, fontWeight: FontWeight.bold),
  required String title,
  required String description,
);

CustomDateRangePicker

CustomDateRangePicker 类帮助显示自定义日期范围选择对话框。

showCustomDateRangePicker(
  required BuildContext context,
  required Function onCancelClick,
  String applyButtonText: 'Apply',
  String cancelButtonText: 'Cancel',
  Color leftArrowColor: Colors.blue,
  Color rightArrowColor: Colors.blue,
  Color applyButtonColor: Colors.blue,
  Color cancelButtonColor: Colors.red,
  Color weekDaysTextColor: Colors.blue,
  Color selectedRangeColor: Colors.blue,
  Color monthYearTextColor: Colors.black,
  required Function(DateTime startDate, DateTime endDate) onApplyClick,
  TextStyle applyButtonTextStyle: const TextStyle(fontSize: 18, color: Colors.white, fontWeight: FontWeight.bold),
  TextStyle cancelButtonTextStyle: const TextStyle(fontSize: 18, color: Colors.white, fontWeight: FontWeight.bold),
  DateTime minimumDate,
  DateTime maximumDate,
  DateTime initialEndDate,
  DateTime initialStartDate,
  bool barrierDismissible: false,
);

CustomDatePicker

CustomDatePicker 类帮助显示自定义日期选择对话框。

showCustomDatePicker(
  required BuildContext context,
  required Function onCancelClick,
  String applyButtonText: 'Apply',
  String cancelButtonText: 'Cancel',
  Color leftArrowColor: Colors.blue,
  Color rightArrowColor: Colors.blue,
  Color applyButtonColor: Colors.blue,
  Color cancelButtonColor: Colors.red,
  Color weekDaysTextColor: Colors.blue,
  Color selectedDateColor: Colors.blue,
  Color monthYearTextColor: Colors.black,
  required Function(DateTime dateTime) onApplyClick,
  TextStyle applyButtonTextStyle: const TextStyle(fontSize: 18, color: Colors.white, fontWeight: FontWeight.bold),
  TextStyle cancelButtonTextStyle: const TextStyle(fontSize: 18, color: Colors.white, fontWeight: FontWeight.bold),
  DateTime minimumDate,
  DateTime maximumDate,
  DateTime initialStartDate,
  bool barrierDismissible: false,
);

ProgressDialog

ProgressDialog 类帮助显示和隐藏带有自定义加载小部件的进度对话框。

// 显示进度对话框
await showProgressDialog(context);

// 隐藏进度对话框
await hideProgressDialog();

ConnectivityBuilder

ConnectivityBuilder 是一个显示连接状态消息的小部件。

ConnectivityBuilder(
    Key? key,
    required builder,
    gradient,
    offlineWidget,
    bgColor: Colors.red,
    position: Position.bottom,
    disableInteraction: false,
    alignment: Alignment.center,
    message: kInternetNotAvailable,
    textStyle: const TextStyle(fontSize: 14, color: Colors.white),
),

DefaultButton

DefaultButton 是一个按钮小部件。

DefaultButton(
    isEnabled: true,
    isUpperCase: true,
    margin: const EdgeInsets.only(top: 20),
    required String text,
    required Function onPressed,
),

HyperLinkText

HyperLinkText 是一个显示文本并点击时打开 URL 的小部件。

HyperLinkText(url: 'http://www.google.com', text: 'Open Google'),

LoadingWidget

LoadingWidget 会显示一个加载闪烁效果。

LoadingWidget(
    itemCount: 6,
    borderRadius: 12,
    highlightColor: Colors.white,
    baseColor: const Color(0xFFE0E0E0),
),

MaterialCard

MaterialCard 是一个有用的卡片视图小部件，可以直接使用或根据需要进行自定义。

MaterialCard(
    required Widget child,
    onTap,
    borderRadius,
    elevation: 4,
    borderRadiusGeometry,
    color: Colors.white,
    padding: const EdgeInsets.all(12),
    margin: const EdgeInsets.only(top: 12),
),

OTPTextField

OTPTextField 是一个用于输入 OTP 的小部件。

OTPTextField(
    required int noOfOtpFields,
    required ValueChanged<String> onCompleted,
    borderWidth: 2,
    isEnabled: true,
    autoFocus: true,
    autoCorrect: false,
    borderColor: Colors.blue,
    cursorColor: Colors.blue,
    textAlign: TextAlign.center,
    margin: const EdgeInsets.only(top: 20, left: 20, right: 20),
    textStyle: const TextStyle(fontSize: 16, letterSpacing: 0.27, color: Colors.black),
),

RichTextWidget

RichTextWidget 是一个帮助显示标题和描述值的小部件。

RichTextWidget(
    required String caption,
    required String description,
    isDescNewLine: false,
    captionStyle: const TextStyle(fontSize: 14, color: Colors.black, fontWeight: FontWeight.normal),
    descriptionStyle: const TextStyle(fontSize: 14, color: Colors.black, fontWeight: FontWeight.normal),
),

CustomToggleButton

CustomToggleButton 会显示带有文本的切换开关。

CustomToggleButton({
    textOn,
    textOff,
    onChanged,
    width: 200,
    height: 45,
    borderRadius: 50,
    transitionTime: 300,
    activeTextColor: Colors.black,
    activeSwitchColor: Colors.white,
    inactiveTextColor: Colors.white,
    inactiveSwitchColor: Colors.blue,
});

DecimalInputFormatter

DecimalInputFormatter 是一个用于允许输入指定小数范围的 TextInputFormatter。

TextFormField(
  inputFormatters: [DecimalInputFormatter(decimalRange: 2)],
  decoration: InputDecoration(labelText: 'Enter Decimal values'),
),

Validators

Validators 类包含用于验证字符串的方法。

TextFormField(
  // 此方法将验证电子邮件地址
  validator: emailValidator,
  decoration: InputDecoration(labelText: 'Enter Email Id'),
),

更多关于Flutter多功能工具插件multiutillib的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

1 回复

更多关于Flutter多功能工具插件multiutillib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，我可以为你提供一个关于如何使用Flutter多功能工具插件 multi_utillib 的代码示例。首先，确保你已经在 pubspec.yaml 文件中添加了该依赖：

dependencies:
  flutter:
    sdk: flutter
  multi_utillib: ^最新版本号  # 替换为实际最新版本号

然后，运行 flutter pub get 来获取依赖。

以下是一个简单的示例，展示了如何使用 multi_utillib 插件中的一些功能。假设 multi_utillib 提供了字符串处理、日期处理和加密解密等功能，以下代码分别展示了这些功能的用法：

import 'package:flutter/material.dart';
import 'package:multi_utillib/multi_utillib.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'MultiUtilLib Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MultiUtilLibDemo(),
    );
  }
}

class MultiUtilLibDemo extends StatefulWidget {
  @override
  _MultiUtilLibDemoState createState() => _MultiUtilLibDemoState();
}

class _MultiUtilLibDemoState extends State<MultiUtilLibDemo> {
  String? encryptedText;
  String? decryptedText;
  String formattedDate = '';
  String reversedString = '';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('MultiUtilLib Demo'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            // 字符串处理示例：反转字符串
            TextField(
              decoration: InputDecoration(labelText: 'Enter text to reverse'),
              onChanged: (value) {
                setState(() {
                  reversedString = value.split('').reversed.join('');
                });
              },
            ),
            SizedBox(height: 16),
            Text('Reversed Text: $reversedString'),

            // 日期处理示例：格式化当前日期
            SizedBox(height: 16),
            Text('Formatted Date: ${formatDate(DateTime.now())}'),

            // 加密解密示例
            SizedBox(height: 16),
            TextField(
              decoration: InputDecoration(labelText: 'Enter text to encrypt'),
              onEditingComplete: () {
                setState(() {
                  encryptedText = encryptText(reversedString ?? '');
                });
              },
            ),
            SizedBox(height: 16),
            Text('Encrypted Text: $encryptedText'),

            SizedBox(height: 16),
            TextField(
              decoration: InputDecoration(labelText: 'Enter encrypted text to decrypt'),
              onEditingComplete: () {
                setState(() {
                  decryptedText = decryptText(encryptedText ?? '');
                });
              },
            ),
            SizedBox(height: 16),
            Text('Decrypted Text: $decryptedText'),
          ],
        ),
      ),
    );
  }

  // 假设multi_utillib提供了这些函数，实际使用时请参考文档
  String formatDate(DateTime date) {
    // 示例：格式化日期为 YYYY-MM-DD
    return date.toIso8601String().split('T').first;
  }

  String encryptText(String text) {
    // 示例：简单的Base64加密（实际应使用更安全的加密方法）
    return base64Encode(utf8.encode(text));
  }

  String decryptText(String encryptedText) {
    // 示例：简单的Base64解密
    return utf8.decode(base64Decode(encryptedText));
  }
}

注意：

  1. 上述代码中的 formatDate, encryptText, 和 decryptText 函数是假设 multi_utillib 提供了这些功能。实际使用中，你需要根据 multi_utillib 的文档来调用相应的函数。
  2. Base64 加密并不是一种安全的加密方法，仅用于示例。实际应用中应使用更安全的加密方法。
  3. 确保你已经正确导入了 multi_utillib 插件，并且根据该插件的实际API进行了调用。

如果你需要更详细的功能实现，请参考 multi_utillib 的官方文档或示例代码。

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