AFNetworking 3.0 Background Upload not working - ios

Question

I have implemented
-(void)uploadMultipleImagesUsingAFNetworkingMultipartFormat:(id)sender {
NSArray * directoryContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[[FileUtility basePath] stringByAppendingPathComponent:[self getPathOfRootImageFolderDocumentId:#"1"]] error:nil];
NSString *path = [directoryContents objectAtIndex:0];
NSString* filePath=[[[FileUtility basePath] stringByAppendingPathComponent:[self getPathOfRootImageFolderDocumentId:#"1"]] stringByAppendingPathComponent:path];
NSURLSessionConfiguration *config = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:#"com.uploadDocument.Background"];
MBProgressHUD *progres = [MBProgressHUD showHUDAddedTo:[[AppDelegate sharedInstance] window] animated:YES];
progres.mode = MBProgressHUDModeDeterminateHorizontalBar;
progres.progress = 0.0;
if (!self.sessionManager) {
_sessionManager = [[AFHTTPSessionManager alloc] initWithSessionConfiguration:config];
}
NSError *error;
NSMutableURLRequest *requet= [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:#"POST" URLString:#"URLTO UPLOAD" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> _Nonnull formData) {
NSError *error1;
[formData appendPartWithFileURL:[NSURL fileURLWithPath:filePath] name:#"fileUpload" fileName:path mimeType:#"image/jpeg" error:&error1];
NSLog(#"%#",error1);
} error:&error];
NSURLSessionUploadTask *uploadTask = [self.sessionManager uploadTaskWithRequest:requet fromFile:[NSURL fileURLWithPath:filePath] progress:^(NSProgress * _Nonnull uploadProgress) {
dispatch_async(dispatch_get_main_queue(), ^{
[progres setProgress:uploadProgress.fractionCompleted];
});
NSLog(#" Progress %f",uploadProgress.fractionCompleted);
} completionHandler:^(NSURLResponse * _Nonnull response, id _Nullable responseObject, NSError * _Nullable error) {
dispatch_async(dispatch_get_main_queue(), ^{
[MBProgressHUD hideHUDForView:[AppDelegate sharedInstance].window animated:YES];
});
}];
[uploadTask resume];
}
But when i put it in background, and set active after some time. i observe that process start from where is paused.
How to continue upload task in background too?

Answer 1

plz on background fetch in background modes then try :)

Answer 2

You just need to add below code as there is bug in NSURLSessionTask for background task.
// Prepare a temporary file to store the multipart request prior to sending it to the server due to an alleged
// bug in NSURLSessionTask.
NSString* tmpFilename = [NSString stringWithFormat:#"%f", [NSDate timeIntervalSinceReferenceDate]];
NSURL* tmpFileUrl = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:tmpFilename]];
// Dump multipart request into the temporary file.
[[AFHTTPRequestSerializer serializer] requestWithMultipartFormRequest:requet
writingStreamContentsToFile:tmpFileUrl
completionHandler:^(NSError *error)
{
// Once the multipart form is serialized into a temporary file, we can initialize
// the actual HTTP request using session manager.
// Here note that we are submitting the initial multipart request. We are, however,
// forcing the body stream to be read from the temporary file.
NSURLSessionUploadTask *uploadTask = [self.sessionManager uploadTaskWithRequest:requet fromFile:tmpFileUrl progress:^(NSProgress * _Nonnull uploadProgress) {
dispatch_async(dispatch_get_main_queue(), ^{
[progres setProgress:uploadProgress.fractionCompleted];
});
NSLog(#" Progress %f",uploadProgress.fractionCompleted);
} completionHandler:^(NSURLResponse * _Nonnull response, id _Nullable responseObject, NSError * _Nullable error) {
dispatch_async(dispatch_get_main_queue(), ^{
[MBProgressHUD hideHUDForView:[AppDelegate sharedInstance].window animated:YES];
});
}];
[uploadTask resume];
}];
Hope this will help you. And if you have any question then please ask.