翻转View

CGContextRef context = UIGraphicsGetCurrentContext();
[UIView beginAnimations:nil context:context];
[UIView setAnimationTransition:
 UIViewAnimationTransitionFlipFromLeft
                       forView:self.view cache:YES];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:1.0];
[self.view exchangeSubviewAtIndex:0 withSubviewAtIndex:1];
[UIView commitAnimations];