从多个视图向 UINavigationBar 添加和删除 UIBarButtonItems
我目前有一个主窗口设置为 UINavigationController （也是根视图控制器），并且我有两个视图。第一个视图是登录屏幕，第二个屏幕是表格视图屏幕。我希望发生的是根据显示的屏幕显示不同的 UIBarButtonItems。例如，当显示登录屏幕时，我希望在导航栏上显示一个左侧按钮（更具体地说，它是登录前的“设置”按钮）。用户登录后，我希望左侧按钮显示“注销”，右侧按钮显示“重新加载”按钮。我尝试以编程方式添加按钮，但它们不会显示。有什么建议吗？
另外，我已经在 IB 中完成了大部分工作，但我觉得以编程方式添加这些按钮可能会更容易。
I currently have a Main Window set up as a UINavigationController (also is the root view controller), and I have two views. The first view is the login screen, and the second screen is a table view screen. What I would like to have happen is to show different UIBarButtonItems based on what screen is showing up. For instance, when the logon screen is being displayed, I want a left button on the navigation bar to be displayed (more specifically, it'd be a Settings button before logging in). Once the user logs in, I want the left button to say "Logout" and the right to be a reload button. I've tried programmatically adding the buttons, but they won't show up. Any suggestions?
Also, I've gotten most of this done in IB, but I feel like it would probably be easier to add these buttons programmatically.
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UIViewController的所有子类都有一个名为navigationItem。虽然它是只读的，但您可以更改其 属性。因此，在LoginViewController中，您将执行self.navigationItem.leftBarButtonItem = /* Code to create the bar Button */，在TableViewController中也是如此。如果您需要更多详细信息，请告诉我。All subclasses of
UIViewControllerhave a property callednavigationItem. While it is readonly, you can alter its properties. So inLoginViewController, you would doself.navigationItem.leftBarButtonItem = /* Code to create the bar button */and likewise within theTableViewController. Let me know if you need more detail.