title: how to set animation curve when using keyframe animation in ios?
body: <p>How to set animation curve when using UIView's keyframe animation :</p>
  
  <pre><code>animateKeyframesWithDuration:delay:options:animations:completion:
  </code></pre>
  
  <p>Whatever I do in the animation block seems to be linear (unless I use the <code>UIViewKeyframeAnimationOptionCalculationModeCubic</code> option but this isn't what I want).</p>
  
  <p>I'd like to have an ease out curve on the animation like the <code>UIViewAnimationOptionCurveEaseOut</code> option when using regular animation :</p>
  
  <pre><code>animateWithDuration:delay:options:animations:completion:
  </code></pre>