title: UIView transitionWithView: not working
body: <p>I'm making a layout editor for a comic book app. The page of the comic book is divided into rows and then each row has at least one column. When the user performs a vertical swipe over a column, it's supposed to divide into two separate columns. This part already works fine, but I wanted to add a simple curl-up transition for that using +transitionWithView:. Everything still works fine (the column divides nicely) but there's no animation. Here's the code:</p>
  
  <pre><code>- (void)divideColumnView:(CCLayoutColumnView *)columnView atPoint:(CGPoint)_divisionPoint {
  // divides a single column into two smaller ones
  
  // define frames for new columns
  CGRect frameLeft = columnView.frame;
  CGRect frameRight = frameLeft;
  CGFloat width = _divisionPoint.x - frameLeft.origin.x;
  frameLeft.size.width = width;
  frameRight.size.width -= width;
  frameRight.origin.x += width;
  
  
  // set up the container for transition
  UIView *rowView = [columnView superview];
  UIView *containerView = [[UIView alloc] initWithFrame:columnView.frame];
  [rowView addSubview:containerView];
  
  // move the column to the container
  columnView.frame = [containerView convertRect:columnView.frame fromView:rowView];
  [containerView addSubview:columnView];
  
  // set up columns that will be inserted to the container during transition
  CCLayoutColumnView *leftColumnView = [[CCLayoutColumnView alloc] initWithFrame:[containerView convertRect:frameLeft fromView:rowView]];
  CCLayoutColumnView *rightColumnView = [[CCLayoutColumnView alloc] initWithFrame:[containerView convertRect:frameRight fromView:rowView]];
  
  [UIView transitionWithView:containerView
                    duration:0.5
                     options:UIViewAnimationOptionTransitionCurlUp
                  animations:^{
                      [columnView removeFromSuperview];
                      [containerView addSubview:leftColumnView];
                      [containerView addSubview:rightColumnView];
                  }
                  completion:^(BOOL finished){
                      // add columns to their row
                      leftColumnView.frame = frameLeft;
                      rightColumnView.frame = frameRight;
                      [rowView addSubview:leftColumnView];
                      [rowView addSubview:rightColumnView];
  
                      // clean up
                      [containerView removeFromSuperview];
                      [containerView release];
                      [leftColumnView release];
                      [rightColumnView release];
                  }];
  </code></pre>
  
  <p>}</p>
  
  <p>I already checked the geometry of all views and it seems ok. Also, the completion block is executed properly.</p>
  
  <p>What may be the problem?</p>