Upload process blocks other requests AFNetworking 3.0 - ios

Question

I am trying to upload data with AFNetworking and its successful. no problem with that but the problem is when I am doing it in background than the other requests blocks and doesn't give any response until upload progress finishes.
What I did is I made a singleton and declare AFURLSessionManager in that because I want all current running task.
+ (id)sharedInstance
{
static SharedManager *sharedMyManager = nil;
#synchronized(self) {
if (sharedMyManager == nil)
sharedMyManager = [[self alloc] init];
}
return sharedMyManager;
}
Let me tell you simple example.. for one controller, I made a request for upload process like below
ViewController1.m
-(void)postImage{
#try {
NSMutableDictionary *otherParameters = [[NSMutableDictionary alloc]initWithDictionary:_currentPlaceParameters];
[otherParameters setObject:[UtitlityManager getUserID] forKey:#"user_id"];
AFHTTPRequestSerializer *serializer = [AFHTTPRequestSerializer serializer];
NSMutableURLRequest *request =
[serializer multipartFormRequestWithMethod:#"POST" URLString:URL_UPLOAD_PHOTO_VIDEO parameters:otherParameters constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
NSData *thumbImageData = UIImageJPEGRepresentation(dataValue, 0.5);
[formData appendPartWithFileData:thumbImageData name:#"thumbnail" fileName:#"image.jpg" mimeType:#"image/jpeg"];
} error:nil];
//show progress bar on window
AFURLSessionManager *manager = [[SharedManager sharedInstance]manager];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
NSURLSessionUploadTask *uploadTask;
uploadTask = [manager uploadTaskWithStreamedRequest:request progress:^(NSProgress * _Nonnull uploadProgress) {
// This is not called back on the main queue.
// You are responsible for dispatching to the main queue for UI updates
float uploadActualPercentage = uploadProgress.fractionCompleted * 100;
NSLog(#"Multipartdata upload in progress: %#",[NSString stringWithFormat:#"%f %%",uploadActualPercentage]);
}
completionHandler:^(NSURLResponse * _Nonnull response, id _Nullable responseObject, NSError * _Nullable error) {
if (error) {
} else {
NSDictionary *result=[NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:&error];
if([[result objectForKey:#"success"] integerValue]==1){
}else{
[Common showMessageWithMessage:#"Failed, Try again"];
}
}
}];
[uploadTask resume];
} #catch (NSException *exception) {
NSLog(#"EXC: %#",[exception description]);
}
}
And than I try to move another view controller and send a request for get other data ...
ViewController2.m
-(void)getData{
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
[manager POST:url parameters:parameters progress:nil success:^(NSURLSessionTask *task, id responseObject) {
NSDictionary* responseDict = [NSJSONSerialization JSONObjectWithData:responseObject options:kNilOptions error:nil];
} failure:^(NSURLSessionTask *operation, NSError *error) {
}];
}
But this doesn't give response until progress finishes... why so??
Even I try to set this upload process in dispatch_sync but it won't work ... any suggestion on this???