progress(진행상태) 표시

• 공식문서 : https://github.com/joltup/rn-fetch-blob#uploaddownload-progress

[1] Upload progress

// listen to upload progress event
.uploadProgress((written, total) => {
    console.log('uploaded', written / total)
})

[2] Download progress

// listen to download progress event
.progress((received, total) => {
    console.log('progress', received / total)
})

[3] progress 측정 예시

RNFetchBlob.fetch('POST', 'http://www.example.com/upload', {
      //... some headers,
      'Content-Type' : 'octet-stream'
    }, base64DataString)
    // listen to upload progress event
    .uploadProgress((written, total) => {
        console.log('uploaded', written / total)
    })
    // listen to download progress event
    .progress((received, total) => {
        console.log('progress', received / total)
    })
    .then((resp) => {
      // ...
    })
    .catch((err) => {
      // ...
    })