NSURLSession delegate and completionHandler

Question

I am using NSURLSession + NSURLDownloadTask with completionHandler:

[session downloadTaskWithURL:downloadURL completionHandler:^(NSURL *location, NSURLResponse *response, NSError *error)

it works nice.

But when I want to track download in a progressBar I am running into problems. I am trying to use NSURLSessionDownloadDelegate to track loading. With the upper completionHandler it is never called?!

Using:

 NSURLSessionDownloadTask *downloadTask =
[session downloadTaskWithURL:downloadURL];

will call the delegates.

Is there any way to use completionHandler AND delegates?
Or any other way to track download while using completionHandler?

Answer 1

To employ the didWriteData method of the NSURLSessionDownloadDelegate, you sadly have to use the rendition of downloadTaskWithURL without the completionHandler and then implement your own URLSession:downloadTask:didFinishDownloadingToURL: to perform those actions you otherwise would have done in the completion handler.

This is a little annoying (especially since the NSURLSessionDownloadDelegate is set at the session object), but it's how it works.