Flutter货币输入格式化插件cash_input_formatter的使用

Flutter货币输入格式化插件cash_input_formatter的使用

cash_input_formatter 是一个简单的货币输入格式化插件。大多数格式化工具默认会在输入时添加分隔符（如逗号或空格），而此插件只会让用户在输入小数点后添加小数部分。

使用

TextFormField(
  textAlign: TextAlign.center,
  inputFormatters: const [
    CashInputFormatter(),
  ],
),

完整示例代码

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

void main() {
  // 在根目录运行示例应用：flutter run example
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: '现金输入格式化示例',
      theme: ThemeData(
        primarySwatch: Colors.green,
      ),
      home: const MyHomePage(title: '现金输入格式化示例'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  final String title;

  const MyHomePage({super.key, required this.title});

  [@override](/user/override)
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Padding(
          padding: const EdgeInsets.symmetric(horizontal: 20),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              /// 显示带有符号的组件
              Column(
                children: [
                  const Align(
                    alignment: Alignment.centerLeft,
                    child: Text("带符号："),
                  ),
                  Padding(
                    padding: const EdgeInsets.symmetric(vertical: 16.0),
                    child: Column(
                      children: [
                        const Text("在此处输入金额"),
                        Padding(
                          padding: const EdgeInsets.symmetric(horizontal: 50),
                          child: TextFormField(
                            textAlign: TextAlign.center,

                            /// 只需将插件作为输入格式化器添加即可。
                            inputFormatters: const [
                              CashInputFormatter(),
                            ],
                          ),
                        ),
                      ],
                    ),
                  ),
                ],
              ),
              // 元素之间的间距
              const Padding(
                padding: EdgeInsets.symmetric(vertical: 40.0),
              ),

              /// 显示不带符号的组件
              Column(
                children: [
                  Padding(
                    padding: const EdgeInsets.symmetric(vertical: 16.0),
                    child: Column(
                      children: [
                        const Align(
                          alignment: Alignment.centerLeft,
                          child: Text("不带符号："),
                        ),
                        const Text("在此处输入金额"),
                        Padding(
                          padding: const EdgeInsets.symmetric(horizontal: 50),
                          child: TextFormField(
                            textAlign: TextAlign.center,
                            inputFormatters: const [
                              /// 只需将插件作为输入格式化器添加即可。
                              CashInputFormatter(useSymbol: false)
                            ],
                          ),
                        )
                      ],
                    ),
                  ),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }
}