title: Smooth rotation of UIView with touch
body: <p>I'm wondering how to smooth a <code>UITouch</code> in my code. I am able to detect the <code>UItouch</code> on my <code>UIView</code>, but when I try to rotate the view using <code>CGAffineTransform</code>, it does not rotate smoothly. I have to press or long finger touch on iPhone for this kind of rotation.
  How can I perform smooth rotations, like Roambi Visualizer app.
  Thanks for your help.</p>