Pause/Resume download with AFNetworking 3.0 and NSURLSessionDownloadTask Objective-C, OSX - objective-c

Question

I have trouble with creating Pause/Resume download methods in my Objective-C osx app, I have tried some of the answers I found here but nothing seems to work.
Here is my code: `-(void)pauseDownload:(id)sender {
if(!downloadTask) return;
[downloadTask cancelByProducingResumeData:^(NSData * _Nullable resumeData) {
if (!resumeData) return;
[self setDownloadResumeData:resumeData];
[self setDownloadTask:nil];
}];
NSString *datastring = [[NSString alloc] initWithData:downloadResumeData encoding:NSUTF8StringEncoding];
isDownloading = NO;
NSLog(#"data %#", datastring);}`
Continue method:
-(void)continueDownload:(id)sender {
if (!self.downloadResumeData) {
return;
}
self.downloadTask = [manager.session downloadTaskWithResumeData:self.downloadResumeData];
[self.downloadTask resume];
[self setDownloadResumeData:nil];}
And download request with download task:
-(void)downloadRequest:(NSString *)url toDirectory:(NSString *)directoryName atIndex:(NSInteger) rowIndex {
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
NSURL *URL = [NSURL URLWithString:url];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];
NSString *downloadDirectoryPath = [[NSUserDefaults standardUserDefaults] objectForKey:#"downloadPath"];
NSURL *downloadURL;
if (directoryName != nil || ![directoryName isEqualToString:#""]) {
downloadURL = [self createDownloadDirectoryIn:downloadDirectoryPath withName:directoryName];
} else {
downloadURL = [NSURL URLWithString:[[NSUserDefaults standardUserDefaults] objectForKey:#"downloadFolderPath"]];
}
downloadTask = [manager downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) {
NSLog(#"%#", downloadProgress);
// [self downloadStartedWithDownloadId:downloadID andDeviceId:userDeviceID];
isDownloading = YES;
NSNumber *downloadPercentage = [NSNumber numberWithInteger:downloadProgress.fractionCompleted *100];
progressArray[rowIndex] = downloadPercentage;
[self updateProgressBars];
} destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
return [downloadURL URLByAppendingPathComponent:[response suggestedFilename]];
} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
[[files objectAtIndex:self.tableOfContents.selectedRow] setIsFinishedDownloading:YES];
// [self downloadFinishedWithDownloadID:downloadID andDeviceID:userDeviceID];
NSLog(#"File downloaded to: %#", filePath);
}] ;
[downloadTask resume];}
Appreciate any help.