title: Zoom in UIImageView without scrollView nor WebView
body: <p>Is there any code example teaching how to zoom in and out in a UIImageView by user taps?</p>
  
  <p>I know it is possible to do it with UIScrollView and with UIWebView, but these solutions both need a lot of changes in my code, and I'm working on schedule due to college project deadlines.</p>
  
  <p>I want basically an example on how to manipulate directly the UIImageView, having the same behavior as the photo album in iPhone:</p>
  
  <ul>
  <li>first double touch -> zoom in</li>
  <li>second double touch -> zoom out</li>
  <li>pinch and zoom with "two-fingered" multi-touch</li>
  </ul>
  
  <p>Thanks a lot!</p>