AFNetworking 1.x to 3.x migration - get download progress?

Question

I need to download image with progress bar. This is what I've got for in AFNetworking 1.x which is not working for AFNetworking 3.x.

NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:self.mediaItem.media_item_hd_url]];

AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:request];
op.responseSerializer = [AFImageResponseSerializer serializer];

[op setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
    UIImage *image = responseObject;
    _image = image;

    [self.delegate browserItem:self loaded:1.0 finished:YES];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) { }];

[op setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {
    CGFloat progress = ((CGFloat)totalBytesRead)/((CGFloat)totalBytesExpectedToRead);
    [self.delegate browserItem:self loaded:progress finished:NO];
}];

[[NSOperationQueue mainQueue] addOperation:op];

Finally this is what I could come up with, which is not complete. I have no idea how to use progress in code block.

    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
    AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];

    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:self.mediaItem.media_item_hd_url]];

    NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {

        NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil];
        return [documentsDirectoryURL URLByAppendingPathComponent:[response suggestedFilename]];

    } completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {

        NSLog(@"File downloaded to: %@", filePath);
//        UIImage *image = response;
//        _image = image;

        [self.delegate browserItem:self loaded:1.0 finished:YES];

    }];

    [downloadTask resume];

Answer 1

You can get best framework RSNetworkKit which handles all the network call with an ease. It has internally implemented AFNetworking 3.0. It'll gives you download progress in single method either you upload, download.

It has also an enhanced method to show progress on UIImageView. You can find it here. https://github.com/rushisangani/RSNetworkKit