title: LOTKeypath not working in ios but working fine in Android
body: <p>I try to change the colors of a lottie files in iOS.</p>
  
  <p>In Android this works fine:</p>
  
  <pre><code>lottieAnimationView.addValueCallback(new KeyPath("foreground", "**"), LottieProperty.COLOR_FILTER, new LottieValueCallback(colorFilterForeground));
  </code></pre>
  
  <p>How to translate this to iOS objecive c?</p>
  
  <pre><code>LOTKeypath *keypath = [LOTKeypath keypathWidhKeys:@"foreground", @"**", nil];
  LOTColorValueCallback *colorCallback = [LOTColorCallback withCGColor:[UIColor redColor].CGColoer};
  [lottieAnimation setValueDelegate:colorCallback forKeypath:keypath];
  </code></pre>
  
  <p>The above does not work, the color is not changed.</p>
  
  <p>I work with exactly the same lottie.json on Android and iOS.</p>
  
  <p>Best Regards
  Jochen</p>