UIView transition animation does not work with transitionWithView:duration:options:animations:completion method

In iOS Documentation usage of beginAnimation-commitAnimation is discouraged. So for animations and transitions there are new methods that make use of ^blocks. However when I use transitionWithView:duration:options:animations:completion method I get no transition effects.So if I write:

[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp 
                       forView:self.view cache:YES];

firstView.hidden = YES;
secondView.hidden = NO;
[UIView commitAnimations];

it works bu开发者_JAVA技巧t if I do it the following way

[UIView transitionWithView:self.view duration:1.0 options 
      UIViewAnimationCurveEaseIn|UIViewAnimationTransitionCurlUp
        animations:^{
          firstView.hidden = YES;
          secondView.hidden = NO;
         } completion:NULL
         ];

I do not get any transition effects. What am I missing?

---

OK, I've found the subtle detail everyone needs to take note of in order to get the animation and transitions work with the method available in iOS 4 and later.When specifying the animation/transition options for the method we must use the constants with the word "Option" in it. So instead of writing

UIViewAnimationCurveEaseIn|UIViewAnimationTransitionCurlUp

we should write

UIViewAnimationOptionCurveEaseIn|UIViewAnimationOptionTransitionCurlUp

after fixing that the transition worked just fine