更改UINavigationController NavigationBar的动画

Question

现在我使用[self.navigationController setNavigationBarHidden：NO animated：YES];

导航栏从右向左飞过，有没有办法从上到下放下它？

Answer 1

放手一搏：

CATransition *transition = [CATransition animation];
transition.duration = kAnimationDuration;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionPush;
transition.subtype = kCATransitionFromTop;
transition.delegate = self;
[self.navigationController.view.layer addAnimation:transition forKey:nil];

self.navigationController.navigationBarHidden = NO;
[self.navigationController pushViewController:tableViewController animated:YES];

对我来说很棒。

来源：http://www.iphonedevsdk.com/forum/iphone-sdk-development/25045-navigation-controller-custom-animation.html