react-native-file-transfer 
This little plugin lets you easily upload files from your photo library to a web server using a standard multipart/form-data POST request. It does not incorporate the tranfer of photo library images data from Objective-C to JavaScript (which is slow). The request are being made directly from Objective-C.
installation
npm install react-native-file-transfer;- In xcode: Add
RTCFileTransfer.minYour Project > Libraries > React > Base.
how to use it
When you properly add the RCTFileTransfer.m file to your xcode project you may now use it in the js files. Example usage:
var { NativeModules } = require('react-native');
var obj = {
uri, // either an 'assets-library' url (for files from photo library) or an image dataURL
uploadUrl,
fileName,
fileKey, // (default="file") the name of the field in the POST form data under which to store the file
mimeType,
headers,
data: {
// whatever properties you wish to send in the request
// along with the uploaded file
}
};
NativeModules.FileTransfer.upload(obj, (err, res) => {
// handle response
// it is an object with 'status' and 'data' properties
// if the file path protocol is not supported the status will be 0
// and the request won't be made at all
});pull-requests welcome