推荐开源项目：React Native Qiniu SDK - 高效可靠的七牛云存储客户端SDK

// 安装七牛云SDK
npm install qiniu-js
 
// 在React Native项目中使用七牛云SDK上传文件
import React, { useState } from 'react';
import { Button, Text, View } from 'react-native';
import * as FileSystem from 'expo-file-system';
import * as MediaLibrary from 'expo-media-library';
import uuidv4 from 'uuid/v4';
import * as Permissions from 'expo-permissions';
import * as ImagePicker from 'expo-image-picker';
import * as Constants from 'expo-constants';
import * as mime from 'mime-types';
import * as SDK from 'qiniu-js';
 
export default function App() {
  const [uploadResult, setUploadResult] = useState(null);
 
  const uploadToQiniu = async (fileUri) => {
    const { status } = await Permissions.askAsync(Permissions.CAMERA_ROLL);
    if (status !== 'granted') {
      alert('无权访问相册');
      return;
    }
 
    const credentials = await Secrets.getQiniuCredentials();
    const putPolicy = new SDK.rs.PutPolicy({ scope: credentials.bucket });
    const uploadToken = putPolicy.uploadToken(credentials.mac);
    const key = `${uuidv4()}.${mime.extension(fileUri)}`;
 
    const observer = {
      next(res) {
        // 主要用于设置上传进度
        console.log(res.total.percent);
      },
      error(err) {
        console.error(err);
        setUploadResult(err);
      },
      complete(res) {
        console.log(res);
        setUploadResult(res);
      },
    };
 
    SDK.upload(fileUri, { key, token: uploadToken }, observer);
  };
 
  // 选择图片并上传
  const pickImageAndUpload = async () => {
    let pickerResult = await ImagePicker.launchImageLibraryAsync({
      mediaTypes: ImagePicker.MediaTypeOptions.Images,
      allowsEditing: true,
      aspect: [4, 3],
    });
 
    if (!pickerResult.cancelled) {
      uploadToQiniu(pickerResult.uri);
    }
  };
 
  return (
    <View>
      <Button title="选择图片" onPress={pickImageAndUpload} />
      {uploadResult && <Text>{JSON.stringify(uploadResult)}</Text>}
    </View>
  );
}

这段代码示例展示了如何在React Native应用中使用七牛云的JavaScript SDK进行文件上传。首先，它请求相册权限，然后使用uuid生成唯一的文件名，并获取上传凭证。最后，它调用七牛云的SDK.upload函数来上传文件。这个例子简洁明了，并包含了错误处理和进度跟踪，对开发者有很好的教育意义。