React Native 中生成二维码的简单方法

在 React Native 中生成二维码通常需要原生支持来绘制二维码，这可能会带来一些复杂性。然而，有另一种方法可以生成二维码，而无需使用原生代码，那就是使用 JavaScript 库。

1. 安装依赖

首先，我们需要安装一些依赖项。使用以下命令：

expo install react-native-svg react-native-svg-qrcode

2. 导入库

在你的 React Native 组件中，你需要导入以下库：

import React from 'react';
import { View, Text, Button } from 'react-native';
import SvgQrCode from 'react-native-svg-qrcode';

3. 创建二维码

要创建二维码，你可以使用 SvgQrCode 组件。该组件接受一个文本字符串作为 prop，并将其转换为二维码。

const QRCode = () => {
  return (
    <View>
      <SvgQrCode value="Hello, world!" />
    </View>
  );
};

4. 共享二维码

要共享二维码，你可以使用 shareAsync() 方法。该方法接受一个包含二维码图像的 base64 字符串。

const shareQRCode = () => {
  const qrCode = 'data:image/png;base64,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