翻转 UINavigationBar 中的项目？
我的应用程序中有一个部分，我使用 UIViewAnimationTransitionFlipFromLeft 动画来更改视图。同时，我更改了 UINavigationItem 的内容以匹配新视图，特别是 titleView 和 rightBarButtonItem。由于我只知道动画何时即将开始和结束，这似乎是我可以更新 UINavigationItem 的唯一时间。
所以，对于我的问题：
是否可以以类似的方式更改
titleView和rightBarButtonItem，即。使用UIViewAnimationTransitionFlipFromLeft动画进行翻转？如果没有，有什么方法可以在视图翻转的中途更新
UINavigationItem，而不是在动画的开始或结束时？
I have a section in my app where I am changing views by using a UIViewAnimationTransitionFlipFromLeft animation. At the same time, I change the contents of the UINavigationItem to match the new view, specifically the titleView and rightBarButtonItem. Since I only really know when the animation is about to start, and has finished, this seems to be the only times that I can update the UINavigationItem.
So, to my question:
Is it possible to change the
titleViewandrightBarButtonItemin a similar fashion, ie. flipping with aUIViewAnimationTransitionFlipFromLeftanimation?If not, is there any way that I can update the
UINavigationItemhalfway through the view flip, rather than at the start or end of the animation?
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您可以解决 1.
您需要完全控制导航栏才能执行此操作，因此您应该摆脱
UIViewController 上使用的导航栏，并将您自己的 navBar 视图放在那里（其中有一个子视图，即 titleView和 rightBarButtonItem）。这样，您就可以像使用任何其他 UIView 一样翻转这些视图：
或
或等效的东西。希望这会有所帮助，如果您需要更多详细信息，请联系我。
You can solve 1.
You'll need full control of the navigation bar to do this so you should get rid of the one that's there using:
on your UIViewController and putting your own navBar view there instead (which would have a subview that's the titleView and the rightBarButtonItem). That way, you can flip those views as you would any other UIView using:
or
or something equivalent. Hope this helps, ping me if you need more details.
如果您使用
transitionWithView:duration:options:animations:completion:进行过渡，您将知道持续时间。这意味着您可以使用performSelector:withObject:afterDelay:方法在完成一半转换后运行方法。在这种方法中，您可以只更新您的导航项。If you are using
transitionWithView:duration:options:animations:completion:to do the transition, you'll know the duration. That means you can useperformSelector:withObject:afterDelay:method to run a method after half of the transition has been done. In this method you can then just update your navigation item.