后退按钮不会出现在navigationController中 [英] Back button don't appear in navigationController

问题描述

我有一个带有navigationController的UIViewController，我隐藏了后退按钮。这个viewController推送另一个UIViewController，并在这个新的viewController的viewDidLoad中，我做：

I have a UIViewController, with a navigationController, and I hide the back button. This viewController push a other UIViewController, and in the viewDidLoad of this new viewController, I do:

self.navigationItem.hidesBackButton = FALSE;

但后退按钮不会发生。为什么？当我转到iOS 4.2的新Xcode版本时，这不起作用，因为在最新版本中，它一切正常。

But the backbutton doesn't happear. Why? And this don't work when I pass to the new Xcode version for iOS 4.2, because in the latest version, it all works well.

推荐答案

以前的navigationController是否有标题（在导航栏上）？有时，如果没有标题，则会自动隐藏第一个后退按钮。

Is there a title for the previous navigationController (on the navigation bar)? Sometimes, if there is no title, the first back button is hidden automatically.

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