title: How to animate text inside a label from right to left as a new entry comes up?
body: <p>I have a calculator-like with <code>UIButtons</code> for the digits (0 to 9) and one <code>UILabel</code> to display the user's inputs. </p>
  
  <p>I would like that for each input, the digits already in the label moves on the left with a slide animation and the new digit appear from the bottom with an animation. How can I do that?</p>
  
  <p>I tried with a <code>CATransition</code> with <code>kCATransitionMoveIn</code> type but it moves the all label (which makes probably sense as it works on the layer level).</p>
  
  <p>But how can I do it if I just want to move the content (the text) and not the frame or layer?</p>