Here are two suggestions how to solve a horizontal view, that is, a view that differs from the vertical.

Either make it a modal with a risk that it takes ”time” until it appears, the transition can be a bit slow.

.h

@interface XXXX : UIViewController
{
    BOOL isShowingLandscapeController;
}

@property (nonatomic) BOOL isShowingLandscapeController;

.m

- (void)viewDidLoad
{
    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChanged:)  name:UIDeviceOrientationDidChangeNotification object:nil];  
}

-
(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation) orientation {
    return (orientation == UIInterfaceOrientationPortrait);
}

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];
    [super dealloc];  
}

- (void)orientationChanged:(NSNotification
*)notification
{
    [self performSelector:@selector(updateLandscapeView) withObject:nil afterDelay:0];
}

- (void)updateLandscapeView
{
    UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
    if (UIDeviceOrientationIsLandscape(deviceOrientation) && !isShowingLandscapeController)
    {
         UIViewController viewController = [[UIViewController alloc] initWithNibName:nil bundle:nil];
         [self presentModalViewController:viewController animated:YES];
     [[UIApplication sharedApplication] setStatusBarOrientation: deviceOrientation];
         isShowingLandscapeController = YES;
     [viewController release];
   } else if (UIDeviceOrientationIsPortrait(deviceOrientation) && isShowingLandscapeController) {
         [self dismissModalViewControllerAnimated:YES];
         isShowingLandscapeController = NO;
   }
}

You can also choose to do in a different way and it is to use dual views, a tip is to only load what is visible but the code is not included in the example.

.h

@interface XXXX : UIViewController
{
    UIViewController *viewPortrait;
    UIViewController *viewLandscape;
}

@property (nonatomic,assign) UIViewController *viewPortrait;
@property (nonatomic,assign) UIViewController *viewLandscape;

.m

- (void)loadView {
    viewPortrait = [[UIViewController alloc] initWithNibName:nil bundle:nil];
    viewLandscape = [[UIViewController alloc] initWithNibName:nil bundle:nil];
    viewPortrait.hidden = NO;
    viewLandscape.hidden = YES;
}

- (void)viewDidLoad
{
    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChanged:) name:UIDeviceOrientationDidChangeNotification object:nil];

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation) orientation {
     return (orientation == UIInterfaceOrientationPortrait);
}

- (void)dealloc
{
     [[NSNotificationCenter defaultCenter] removeObserver:self];
     [[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];
     [super dealloc];
}

- (void)orientationChanged:(NSNotification *)notification
{
     [self performSelector:@selector(updateLandscapeView) withObject:nil afterDelay:0];
}

- (void)updateLandscapeView
{
    UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;

    if (UIDeviceOrientationIsLandscape(deviceOrientation) )
    {
    viewPortrait.hidden = YES;
        viewLandscape.hidden = NO;
    } else if (UIDeviceOrientationIsPortrait(deviceOrientation) ) {
        viewPortrait.hidden = NO;
        viewLandscape.hidden = YES;
    }
}