popViewController似乎不适用于UIView动画

[UIView beginAnimations:@"animation" context:nil];
[UIView setAnimationDuration:0.5];
[[self navigationController] pushViewController:details animated:NO];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.navigationController.view cache:NO];
[UIView commitAnimations];

此代码使用popViewController(而不是pushViewController)不执行动画。

[UIView beginAnimations:@"animationback" context:nil];
[UIView setAnimationDuration:0.5];
[[self navigationController] popViewControllerAnimated:NO];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.navigationController.view cache:NO]; 
[UIView commitAnimations];

你知道为什么会这样吗?更重要的是,我该怎么解决?