npm react-native-fetch-blob - "RNFetchBlob.fetch is not a function"

Question

我正在使用 npm 包 react-native-fetch-blob。
我已按照 git repository 中的所有步骤使用该包。

然后我使用以下行导入了包：

var RNFetchBlob = require('react-native-fetch-blob');

我正在尝试从服务器请求包含图像的 BLOB。

这是我的主要方法。

fetchAttachment: function(attachment_uri) {

   var authToken = 'youWillNeverGetThis!'
   var deviceId = '123';
   var xAuthToken = deviceId+'#'+authToken

   //Authorization : 'Bearer access-token...',
   // send http request in a new thread (using native code)
   RNFetchBlob.fetch('GET', config.apiRoot+'/app/'+attachment_uri, {

       'Origin': 'http://10.0.1.23:8081',
       'X-AuthToken': xAuthToken
    })
    // when response status code is 200
    .then((res) => {
       // the conversion is done in native code
       let base64Str = res.base64()
       // the following conversions are done in js, it's SYNC
       let text = res.text()
       let json = res.json()
    })
    // Status code is not 200
    .catch((errorMessage, statusCode) => {
       // error handling
    });
}

我不断收到以下错误：

"Possible Unhandled Promise Refection(id: 0): TypeError: RNFetchBlob.fetch is not a function".

有什么想法吗？

Answer 1

问题是您正在使用 ES5 风格的 require 语句和针对 ES6/ES2015 编写的库。您有两个选择：

ES5:

var RNFetchBlob = require('react-native-fetch-blob').default

ES6:

import RNFetchBlob from 'react-native-fetch-blob'

Answer 2

我的导入看起来像这样：从 'rn-fetch-blob' 导入 RNFetchBlob；

但我遇到错误：类型错误：RNFetchBlob.scanFile 不是函数

我的代码：

const downloadAudio = async () => {
    const { config, fs } = RNFetchBlob;
    const meditationFilesPath =
      Platform.OS == 'android'
        ? `${fs.dirs.DownloadDir}/meditations/${id}`
        : `${fs.dirs.DocumentDir}/meditations/${id}`;
    let audio_URL = track;
    let options = {
      fileCache: true,
      path: meditationFilesPath + `/${id}.mp3`,
      addAndroidDownloads: {
        // Related to the Android only
        useDownloadManager: true,
        notification: true,
        path: meditationFilesPath + `/${id}.mp3`,
        description: 'Audio',
      },
    };
    try {
      const resAudio = await config(options).fetch('GET', audio_URL.uri);
      if (resAudio) {
        const audio = await RNFetchBlob.fs.scanFile([
          { path: resAudio.path(), mime: 'audio/mpeg' },
        ]);
        console.log('res -> ', audio);
        Alert.alert('Audio Downloaded Successfully.');
      }
    } catch (error) {
      console.error('error from downloadAudio', error);
    }
  };

npm react-native-fetch-blob - "RNFetchBlob.fetch is not a function"

npm react-native-fetch-blob - "RNFetchBlob.fetch is not a function"

fetch

node.js

npm

react-native