一. Upload Image – fetch

export function postData (url, params, fileURL) {
  let data = new FormData()
  if (fileURL) {
    data.append('image', {uri: fileURL, name: 'image.jpg', type: 'image/jpg'})
  }
  _.each(params, (value, key) => {
    if (value instanceof Date) {
      data.append(key, value.
 
toISOString())
    } else {
      data.append(key, String(value))
    }
  })
  const config = {
    method: 'POST',
    headers: {
      'Accept': 'application/json',
      'Content-Type': 'multipart/form-data; boundary=6ff46e0b6b5148d984f148b6542e5a5d',
      'Content-Language': React.NativeModules.RNI18n.
 
locale,
      'Authorization': 'Token ABCDEF123457890',
    },
    body: data,
  }
  return fetch(API_URL + url, config)
    .then(checkStatusAndGetJSONResponse)
}

var options = {
      title: 'Upload image',
      cancelButtonTitle: 'Cancel',
      takePhotoButtonTitle: 'Take Photo...',
      chooseFromLibraryButtonTitle
 
: 'Choose from Library...',
      returnBase64Image: true,
      returnIsVertical: false
    };
UIImagePickerManager.showImagePicker(options, (type, response) => {
      if (type !== 'cancel') {
        var source;
        if (type === 'data') { 
          source = {uri: 'data:image/jpeg;base64,' + response, isStatic: true};
        } else { 
          source = {uri: response};
        }

        console.log("uploading image");

         fetch('server-endpoint',{
           method: 'post',
           body: "data=" + encodeURIComponent(source.uri)
         }).then(response => {
           console.log("image uploaded")
           console.log(response)
         }).catch(console.log);

        //this.setState({avatarSource:source});
      } else {
        console.log('Cancel');
      }
    });