For iphone development, how to flip a UIImageView?

+ (void)setAnimationTransition:(UIViewAnimationTransition)transition forView:(UIView *)view cache:(BOOL)cache;

UIViewAnimationTransitionFlipFromLeft,
UIViewAnimationTransitionFlipFromRight,

CGContextRef context = UIGraphicsGetCurrentContext();

[UIView beginAnimations:nil context:context];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:yourContainerView cache:YES];
[yourContainerView exchangeSubviewAtIndex:0 withSubviewAtIndex:1];
[UIView commitAnimations];

- (void)loadFlipsideViewController {

    FlipsideViewController *viewController = [[FlipsideViewController alloc] initWithNibName:@"FlipsideView" bundle:nil];
    self.flipsideViewController = viewController;
    [viewController release];

    // Set up the navigation bar
    UINavigationBar *aNavigationBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 44.0)];
    aNavigationBar.barStyle = UIBarStyleBlackOpaque;
    self.flipsideNavigationBar = aNavigationBar;
    [aNavigationBar release];

    UIBarButtonItem *buttonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(toggleView)];
    UINavigationItem *navigationItem = [[UINavigationItem alloc] initWithTitle:@"Test123"];
    navigationItem.rightBarButtonItem = buttonItem;
    [flipsideNavigationBar pushNavigationItem:navigationItem animated:NO];
    [navigationItem release];
    [buttonItem release];
}


- (IBAction)toggleView {
    /*
     This method is called when the info or Done button is pressed.
     It flips the displayed view from the main view to the flipside view and vice-versa.
     */
    if (flipsideViewController == nil) {
        [self loadFlipsideViewController];
    }

    UIView *mainView = mainViewController.view;
    UIView *flipsideView = flipsideViewController.view;

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:1];
    [UIView setAnimationTransition:([mainView superview] ? UIViewAnimationTransitionFlipFromRight : UIViewAnimationTransitionFlipFromLeft) forView:self.view cache:YES];

    if ([mainView superview] != nil) {
        [flipsideViewController viewWillAppear:YES];
        [mainViewController viewWillDisappear:YES];
        [mainView removeFromSuperview];
        [infoButton removeFromSuperview];
        [self.view addSubview:flipsideView];
        [self.view insertSubview:flipsideNavigationBar aboveSubview:flipsideView];
        [mainViewController viewDidDisappear:YES];
        [flipsideViewController viewDidAppear:YES];

    } else {
        [mainViewController viewWillAppear:YES];
        [flipsideViewController viewWillDisappear:YES];
        [flipsideView removeFromSuperview];
        [flipsideNavigationBar removeFromSuperview];
        [self.view addSubview:mainView];
        [self.view insertSubview:infoButton aboveSubview:mainViewController.view];
        [flipsideViewController viewDidDisappear:YES];
        [mainViewController viewDidAppear:YES];
    }
    [UIView commitAnimations];
}