title: Get album artwork from MP3 file/ID3 tag
body: <p>I'm trying to get the album artwork from a MP3 file. </p>
  
  <p>In this case I use <code>AVAudioPlayer</code> to play the file. </p>
  
  <p>Here's the code <em>that I thought</em> would get the album artwork:</p>
  
  <pre><code>MPMusicPlayerController *controller = [MPMusicPlayerController applicationMusicPlayer];
  
  MPMediaItem *current = controller.nowPlayingItem;
  
  MPMediaItemArtwork *artwork = [current valueForProperty:MPMediaItemPropertyArtwork];
  UIImage *artwork2 = [artwork imageWithSize:artwork.bounds.size];
  [artworkView setImage:artwork2];
  </code></pre>
  
  <p>However <code>artworkView</code> doesn't contain any image whatsoever.</p>
  
  <p>I'm a little bit stuck.</p>
  
  <p>If any one could help by providing suggestions to where/how I can get the artwork directly from the ID3 tag, that would be of great use. </p>
  
  <p>Any help appreciated.</p>