title: DelayTime or UnclampedDelayTime for GIFS
body: <p>When converting a Gif into a animated UIImage the delay for each frame is extracted from properties <code>kCGImagePropertyGIFDelayTime</code> or <code>kCGImagePropertyGIFUnclampedDelayTime</code></p>
  
  <p>Like so:</p>
  
  <pre><code>NSString *frameKeyPath = [NSString stringWithFormat:@"%@.%@",(NSString*)kCGImagePropertyGIFDictionary,kCGImagePropertyGIFUnclampedDelayTime];
  CFDictionaryRef cfFrameProperties = CGImageSourceCopyPropertiesAtIndex(source,i,nil);
  NSDictionary *frameProperties = (__bridge NSDictionary*)cfFrameProperties;
  NSNumber *delayTimeProp = [frameProperties valueForKeyPath:frameKeyPath];
  </code></pre>
  
  <p>Chrome chooses the correct one in both example cases:</p>
  
  <p><code>kCGImagePropertyGIFDelayTime</code> = 0.1 : <a href="http://i.imgur.com/tX9cjUO.gif" rel="noreferrer">http://i.imgur.com/tX9cjUO.gif</a></p>
  
  <p><code>kCGImagePropertyGIFUnclampedDelayTime</code> = 0.01 : <a href="http://i.minus.com/iIOyK7SKp8TYc.gif" rel="noreferrer">http://i.minus.com/iIOyK7SKp8TYc.gif</a></p>
  
  <p>Choosing one for every case results in one of the example images animating too slow or too fast</p>
  
  <p>Is there a way to determine which property to use?</p>
  
  <p>Thanks</p>