title: UIView surface custom transformation/animation (like 'a water drop effect')
body: <p>What is the way to implement <strong>custom transformation</strong> (+ animation) on a <strong>view surface</strong> (similar to the images attached) (<strong><em>not</em></strong> just the <strong><em>view bounds</em></strong>).</p>
  
  <p>The question is mainly in <strong>what is the general way</strong> to do that (not exactly the 'water drop effect', but any examples would be appreciated for sure). I guess, that's some 'algorythmic' transformation of the layer layout 'grid', but not sure which way to 'dig' that in.</p>
  
  <p>(Another thought is that might be achieved with using some frameworks, however, I would still need to understand the core logic).</p>
  
  <p><strong>UPDATE:</strong></p>
  
  <p>Pretty good resource for animations lovers recently been found from one of the answers: <a href="http://iphonedevwiki.net/index.php/UIViewAnimationState" rel="nofollow noreferrer">iPhone Development Wiki</a>.</p>
  
  <p><img src="https://i.stack.imgur.com/WmehM.png" alt="transformation sample 1">
  <img src="https://i.stack.imgur.com/Uapu8.png" alt="transformation sample 2"></p>