Animation constants were determined based on portrait mode. If you define your application only in landscape mode, you should think about these animation constants by tilting your head 90 degrees.
Suppose the top of your device is indicated on the left, than you set the animation with
[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.navigationController.view cache:YES];
and it will curl to the right. This is because in this case the bottom of the device is facing right.
, UIViewAnimationTransitionFlipFromBottom . , 90 , .