如何使用Flutter实现生成二维码

  flutter:
    sdk: flutter
  qr_flutter: ^4.0.1

import 'package:flutter/material.dart';
import 'package:qr_flutter/qr_flutter.dart';  // 导入 qr_flutter 插件
 
void main() {
  runApp(MyApp());
}
 
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: QRCodeScreen(),
    );
  }
}
 
class QRCodeScreen extends StatefulWidget {
  @override
  _QRCodeScreenState createState() => _QRCodeScreenState();
}
 
class _QRCodeScreenState extends State<QRCodeScreen> {
  // 用于存储二维码的文本内容
  TextEditingController _controller = TextEditingController();
 
  @override
  void initState() {
    super.initState();
    // 默认二维码内容
    _controller.text = '输入内容改变二维码';
  }
 
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('QR Code Example'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            // 一行显示两个二维码
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                // 普通二维码
                Column(
                  children: <Widget>[
                    QrImageView(
                      data: _controller.text,  // 使用输入框的内容
                      version: QrVersions.auto,
                      size: 160,  // 设置二维码大小
                      gapless: false,
                    ),
                    const SizedBox(height: 10),
                    const Text('普通二维码', style: TextStyle(fontSize: 16)),
                  ],
                ),
                const SizedBox(width: 20),
                // 带图像的二维码
                Column(
                  children: <Widget>[
                    QrImageView(
                      data: _controller.text,  // 使用输入框的内容
                      version: QrVersions.auto,
                      size: 160,  // 设置二维码大小
                      gapless: false,
                      embeddedImage: const AssetImage('assets/weChat.png'),  // 嵌入图片
                      embeddedImageStyle: const QrEmbeddedImageStyle(
                        size: Size(20, 20),
                      ),
                    ),
                    SizedBox(height: 10),
                    Text('带图二维码', style: TextStyle(fontSize: 16)),
                  ],
                ),
              ],
            ),
            const SizedBox(height: 30),
            // 输入框，用户可以更改二维码内容
            TextField(
              controller: _controller,  // 使用文本控制器
              decoration: const InputDecoration(
                labelText: 'Enter QR code content',
                border: OutlineInputBorder(),
              ),
              onChanged: (value) {
                setState(() {});  // 更新UI，当输入框内容变化时刷新二维码
              },
            ),
          ],
        ),
      ),
    );
  }
}