title: Loading takes a while when i set UIImage to a NSData with a url.
body: <pre><code>NSData *imageUrl = [NSData dataWithContentsOfURL:[NSURL URLWithString:[[self.content objectAtIndex:indexPath.row] valueForKey:@"imageUrl"] ]];
  cell.thumbnailImageView.image=[UIImage imageWithData:imageUrl];
  </code></pre>
  
  <p>this is how i use <code>imageUrl</code> to load them into <code>UIImage</code> but it takes a while to load and the program seems like it crashed or entered to an infinite loop.</p>
  
  <p>How can i make the content of <code>UIImage</code> with url but faster?</p>