Views without resizing after rotation in a custom container ship

I made a test application to familiarize myself with creating a custom container controller. If I rotate the device when the application starts first or after switching to another view controller, the new view is resized to cover the entire screen, as I expected. However, if I turn around after starting the application, and then switch to the new view controller, the view will retain its portrait size, and will not become shorter and wider (in fact, it is slightly different - it goes from 320,460 to 300,480). The main view controller is alloc init'd in the application deletion (no xib) and is set as the root window view controller. Here is the code that I have in my MasterViewController (custom container controller):

- (void)viewDidLoad {
    [super viewDidLoad];
    WelcomeController *welcome = [[WelcomeController alloc] initWithNibName:@"ViewController" bundle:nil];
    self.currentController = welcome;
    [self addChildViewController:welcome];
    [self.view addSubview:welcome.view];

    UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeLeft:)];
    swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
    [self.view addGestureRecognizer:swipeLeft];
}


- (void)swipeLeft:(UISwipeGestureRecognizer *)gesture {
    if (gesture.state == UIGestureRecognizerStateRecognized) {
        UIActionSheet *sheet =[[UIActionSheet alloc] initWithTitle:@"Select A Destination" delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"welcome",@"Play",@"Scores", nil];
        [sheet showInView:self.view];
    }
}

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
    switch (buttonIndex) {
        case 0:{
            if ([self.currentController class] != [WelcomeController class] ) {
                WelcomeController *welcome = [[WelcomeController alloc] initWithNibName:@"ViewController" bundle:nil];
                [self addChildViewController:welcome];
                [self moveToNewController:welcome];
            }
            break;
        }
        case 1:{
            if ([self.currentController class] != [PlayViewController class] ) {
                PlayViewController *player = [[PlayViewController alloc] initWithNibName:@"PlayViewController" bundle:nil];
                [self addChildViewController:player];
                [self moveToNewController:player];
            }
            break;
        }
        case 2:{
            if ([self.currentController class] != [HighScores class] ) {
                HighScores *scorer = [[HighScores alloc] initWithNibName:@"HighScores" bundle:nil];
                [self addChildViewController:scorer];
                [self moveToNewController:scorer];
            }
            break;
        }
        case 3:
            NSLog(@"Cancelled");
            break;

        default:
            break;
    }
}

-(void)moveToNewController:(id) newController {
    [self.currentController willMoveToParentViewController:nil];
    [self transitionFromViewController:self.currentController toViewController:newController duration:.6 options:UIViewAnimationOptionTransitionCrossDissolve animations:^{}
     completion:^(BOOL finished) {
         [self.currentController removeFromParentViewController];
         [newController didMoveToParentViewController:self];
         self.currentController = newController;
     }];
}


- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;//(interfaceOrientation == (UIInterfaceOrientationPortrait | UIInterfaceOrientationLandscapeLeft));
}

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