TiApp_changes.m

// at the top of the file
@interface TiApp()
- (void)checkBackgroundServices;
- (void)appBoot;
@property (atomic) NSMutableDictionary *responsesData; //here we are holding the responsesData, using their taskIdentifiers as keys
@end
// Here I initialise the property
- (void)appBoot
{	
	kjsBridge = [[KrollBridge alloc] initWithHost:self];	
	[kjsBridge boot:self url:nil preload:nil];
	[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    self.responsesData = [[NSMutableDictionary alloc] init]; //initialising the dictionary holding the responses
}
//delegate method from NSURLSessionDataDelegate , not implemented yet in TiApp.m
-(void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data
{
    //Not very nice but I defined and initialised self.responsesData which is an NSMutableDictionary holding responses data
    // defined as @property (atomic) NSMutableDictionary *responsesData
    //initialised in appBoot
    NSMutableData *responseData = self.responsesData[@(dataTask.taskIdentifier)];
    if (!responseData) {
        responseData = [NSMutableData dataWithData:data];
        self.responsesData[@(dataTask.taskIdentifier)] = responseData;       
    } else {
        [responseData appendData:data];
    }
}

-(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error
{
    //FunctionName();
    
    NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                 [NSNumber numberWithUnsignedInteger:task.taskIdentifier], @"taskIdentifier",
                          nil];
    
    if (session.configuration.identifier) {
        [dict setObject:session.configuration.identifier forKey:@"sessionIdentifier"];
    }
    
    if (error) {
        NSDictionary * errorinfo = [NSDictionary dictionaryWithObjectsAndKeys:NUMBOOL(NO), @"success",
                                                NUMINTEGER([error code]), @"errorCode",
                                                [error localizedDescription], @"message",
                                                nil];
        [dict addEntriesFromDictionary:errorinfo];
    } else {
        NSMutableData *responseData = self.responsesData[@(task.taskIdentifier)];
        NSString *responseText = nil;
        if (responseData) {
            //we only send responseText as this is the responsesData dictionary only gets filled with data from uploads
            responseText = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
            
            [self.responsesData removeObjectForKey:@(task.taskIdentifier)];
        }
        
        NSDictionary * success = [NSMutableDictionary dictionaryWithObjectsAndKeys:NUMBOOL(YES), @"success",
                                              NUMINT(0), @"errorCode",
                                              @"", @"message",
                                              responseText,@"responseText",
                                              nil];
        [dict addEntriesFromDictionary:success];
    }
    [[NSNotificationCenter defaultCenter] postNotificationName:kTiURLSessionCompleted object:self userInfo:dict];
}