title: setFrame working on iOS7 but not anymore on iOS6
body: <p>I just switched to iOS7 SDK.
  My app worked fine before this on iOS6 but not anymore except it works fine on iOS7 now.</p>
  
  <p>I have a scrollView with page control to show 3 different tabs with the following settings:</p>
  
  <pre><code>self.scrollView.pagingEnabled = YES;
  self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * 3, self.scrollView.frame.size.height);
  self.scrollView.showsHorizontalScrollIndicator = NO;
  self.scrollView.showsVerticalScrollIndicator = NO;
  self.scrollView.scrollsToTop = NO;
  self.scrollView.delegate = self;
  </code></pre>
  
  <p>I add on this scrollView my 3 views which I load from 3 different storyboards:</p>
  
  <pre><code>    UIStoryboard *timelineStoryboard=[UIStoryboard storyboardWithName:@"timelineStoryboard" bundle:nil];
  TabBarViewController *mainVC=[timelineStoryboard instantiateInitialViewController];
  self.currentViewController =mainVC;
  [mainVC.view setFrame:CGRectMake(320, 20, mainVC.view.frame.size.width, mainVC.view.frame.size.height)];
  [self.scrollView addSubview:mainVC.view];
  [self addChildViewController:mainVC]; 
  
  UIStoryboard *expenseStoryboard=[UIStoryboard storyboardWithName:@"expenseStoryboard" bundle:nil];
  TabBarViewController *leftVC=[expenseStoryboard instantiateInitialViewController];
  self.leftViewController =leftVC;
  [leftVC.view setFrame:CGRectMake(0, 20, leftVC.view.frame.size.width, leftVC.view.frame.size.height)];
  [self.leftViewController.view setFrame:CGRectMake(0, 20, leftVC.view.frame.size.width, leftVC.view.frame.size.height)];
  [self.scrollView addSubview:leftVC.view];
  [self addChildViewController:leftVC];
  
  
  UIStoryboard *dashboardStoryboard=[UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
  TabBarViewController *rightVC=[dashboardStoryboard instantiateViewControllerWithIdentifier:@"dashboardVC"];
  self.leftViewController =rightVC;
  [rightVC.view setFrame:CGRectMake(640, 20, rightVC.view.frame.size.width, rightVC.view.frame.size.height)];
  [self.scrollView addSubview:rightVC.view];
  [self addChildViewController:rightVC];
  </code></pre>
  
  <p>On iOS6, these 3 views are display on top of each other whereas on iOS7 they are correctly displayed (on with abscissa 0, one with x=320 and another one with x=640).
  Does anyone have any idea on how to fix this?</p>
  
  <p>Many thanks</p>