title: CGAffineTransform changes view.bounds?
body: <blockquote>
    <p>Views have both a frame (coordinates in superview's coordinate system)
    and bounds (coordinates in own coordinate system) property, but if you
    transform a view, you should not use or rely on the frame property
    anymore. If you are using transformations, work with the bounds
    property only, not the frame property, as transformations are applied
    to the bounds, but aren't necessarily reflected accurately in frame</p>
  </blockquote>
  
  <p><a href="http://iphonedevelopment.blogspot.jp/2008/10/demystifying-cgaffinetransform.html" rel="noreferrer">http://iphonedevelopment.blogspot.jp/2008/10/demystifying-cgaffinetransform.html</a></p>
  
  <p>I wanted to see what he means in the above paragraph and printed 'frame' and 'bounds'<br>
  And I see only 'frame' is changing during the pinch. </p>
  
  <pre><code>- (IBAction)handlePinch:(UIPinchGestureRecognizer*)recognizer
  {
      NSLog(@"scale: %f, velocity: %f", recognizer.scale, recognizer.velocity);
      NSLog(@"Before, frame: %@, bounds: %@", NSStringFromCGRect(recognizer.view.frame), NSStringFromCGRect(recognizer.view.bounds));
      recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale);
      NSLog(@"After, frame: %@, bounds: %@", NSStringFromCGRect(recognizer.view.frame), NSStringFromCGRect(recognizer.view.bounds));
  
      recognizer.scale = 1;
  }
  </code></pre>
  
  <p>output:(zomming in)</p>
  
  <pre><code>2012-07-02 14:53:51.458 GestureRec[1264:707] scale: 1.030111, velocity: 0.945660
  2012-07-02 14:53:51.466 GestureRec[1264:707] Before, frame: {{0, 124}, {320, 160}}, bounds: {{0, 0}, {320, 160}}
  2012-07-02 14:53:51.473 GestureRec[1264:707] After, frame: {{-4.81771, 121.591}, {329.635, 164.818}}, bounds: {{0, 0}, {320, 160}}
  2012-07-02 14:53:51.480 GestureRec[1264:707] scale: 1.074539, velocity: 1.889658
  2012-07-02 14:53:51.484 GestureRec[1264:707] Before, frame: {{-4.81771, 121.591}, {329.635, 164.818}}, bounds: {{0, 0}, {320, 160}}
  2012-07-02 14:53:51.494 GestureRec[1264:707] After, frame: {{-17.103, 115.449}, {354.206, 177.103}}, bounds: {{0, 0}, {320, 160}}
  2012-07-02 14:53:51.499 GestureRec[1264:707] scale: 1.000000, velocity: 1.889658
  2012-07-02 14:53:51.506 GestureRec[1264:707] Before, frame: {{-17.103, 115.449}, {354.206, 177.103}}, bounds: {{0, 0}, {320, 160}}
  2012-07-02 14:53:51.510 GestureRec[1264:707] After, frame: {{-17.103, 115.449}, {354.206, 177.103}}, bounds: {{0, 0}, {320, 160}}
  </code></pre>
  
  <p>Am I misunderstanding something or the author in the blog is wrong? </p>