页面动画

ATFrom:
UIViewAnimationTransitionCurlUp 
UIViewAnimationTransitionCurlDown
UIViewAnimationTransitionFlipFromLeft 
UIViewAnimationTransitionFlipFromRight
-(id) AnimationTransition:(UIViewAnimationTransition)ATFrom
{
    [UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.75];
[UIView setAnimationTransition:(ATFrom)
  forView:scrollView cache:YES];
    [UIView commitAnimations];
    return  nil;
}