使用 qr_flutter 包时，我收到错误“参数类型‘QrImage’无法分配给参数类型‘Widget？’。”对于 QrImage()

Question

在使用 qr_flutter 包时，我收到错误“参数类型‘QrImage’无法分配给参数类型‘Widget？’。”对于 QrImage()

import 'package:flutter/material.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:qr_flutter/qr_flutter.dart';

class ProfileScreen extends StatelessWidget {
  final String userId;

  const ProfileScreen({Key? key, required this.userId}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Your Profile'),
        actions: [
          IconButton(
            icon: const Icon(Icons.logout),
            onPressed: () async {
              try {
                await FirebaseAuth.instance.signOut();
                Navigator.of(context).pushReplacementNamed('/login');
              } catch (e) {
                print('Logout failed: $e');
                // Handle logout failure
              }
            },
          ),
        ],
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Center(
              child: QrImage(
                data: userId, // Use the provided user ID to generate a unique QR code
                version: QrVersions.auto,
                size: 200.0,
              ),
            ),
            const SizedBox(height: 20),
            // Additional user information widgets can be added here
            // For example, you can fetch and display the user's name, email, etc.
          ],
        ),
      ),
    );
  }
}

我有flutter版本“Flutter 3.16.2”。并且依赖项也添加到pubspec.yaml文件中。

仍然出现如图所示的错误：

我已将频道更改为 Beta（之后又恢复为稳定版） flutter 升级到最新版本 添加了适当的依赖项 尝试重新打开 vscode

Answer 1

使用

QRImageView

小部件。

Center(
  child: QrImageView(
    data: userId, // Use the provided user ID to generate a unique QR code
    version: QrVersions.auto,
    size: 200.0,
  ),
),