title: AFNetworking check progress
body: <p>I'm using the AFNetworking framework to download files and write them to the local file system.</p>
  
  <p>But since the files can be quite big I want to add a <code>UIProgressView</code>, but I can't seem to find any method that gets updated with the progress.</p>
  
  <p>I see people talking about setProgressBlock, but I can't find any information about this in the docs: <a href="http://afnetworking.org/Documentation/Classes/AFHTTPRequestOperation.html" rel="nofollow">http://afnetworking.org/Documentation/Classes/AFHTTPRequestOperation.html</a></p>
  
  <p>Is there a method that does this? I'm just using <code>AFHTTPRequestOperation</code> to download the files.</p>