UINavigationController 后退按钮不可见，但有效

UINavigationController Back Button not visible, but works(UINavigationController 后退按钮不可见，但有效)

问题描述

我的 UINavigationController 缺少后退按钮(左按钮)但点击左按钮似乎仍然有效.

I have a scenario where my UINavigationController is missing the back button (left button) but tapping the left button still seems to work.

我在此处发现了类似的问题:UINavigationController 的后退按钮消失?通过不将标题设置为@"解决了这个问题，但这不是我的问题.是否有任何其他情况会导致此行为?

I found a similar problem posted here: UINavigationController's back button disappears? which was resolved by not setting the title to @"", but that's not my problem. Are there any other scenarios that would cause this behaviour?

更新:

如果重要的是我的视图层次结构:我的 MainWindow 包含一个 UINavigationView，它首先加载一个 UIViewController(这个视图包含一个地图).当点击注释附件按钮时，它会加载一个 UITableViewController.正是这个视图应该有后退按钮.

In case it matters here is my view hierarchy: My MainWindow contains a UINavigationView which first loads a UIViewController (this view contains a Map). When tapping on an annotation accessory button it then loads a UITableViewController. It's this view that should have the back button.

谢谢.

推荐答案

天啊！好的，我在 iphonedevsdk.com 上的一篇文章中找到了答案，现已不复存在.

Oh Man! Ok, I found the answer in an article on iphonedevsdk.com, now defunct.

事实证明，我的第一个视图(上面有地图的那个)没有设置标题(实际上我隐藏了导航栏，因为我不想显示它).即使在稍后的视图中设置了标题，SDK 似乎也不在乎.我仍然不能 100% 理解为什么我可以点击该区域以使其工作.

It turns out that my first view (the one with the map on it) didn't have a title set (in fact I hide the navigation bar because I didn't want to show it). Even if the title WAS set on a later view the SDK doesn't seem to care. I still don't understand 100% why I could tap in the area to get it to work.

所以即使我隐藏了第一个导航栏，我仍然需要设置它的标题.

So even though I hide the first navigation bar I still need to set the title of it.

做到了！

感谢所有尝试提供帮助的人.

Thanks to everyone who tried to help.

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