title: How to custom UIViewAnimationCurve like CAMediaTimingFunction's functionWithControlPoints
body: <p>the <strong>UIViewAnimationCurve</strong> only have</p>
  
  <ul>
  <li>UIViewAnimationCurveEaseInOut</li>
  <li>UIViewAnimationCurveEaseIn</li>
  <li>UIViewAnimationCurveEaseOut</li>
  <li>UIViewAnimationCurveLinear</li>
  </ul>
  
  <p>these functions.</p>
  
  <p>but,I need like <strong>ExpoOut</strong> , <strong>BackInOut</strong> animation for UIView.</p>
  
  <p>like ExpoOut is <code>[CAMediaTimingFunction functionWithControlPoints:0.12 :0.51 :-0.4 :1];</code></p>
  
  <p>I has used <strong>CABasicAnimation</strong>,but it can not change <strong>frame</strong> like UIView animation,it very bad when change the view size.</p>
  
  <p>or,are you have any better way to change view frame like real,not look like zoomin.</p>
  
  <p>thanks.</p>