iPhone UINavigationController inside UIViewController

问题

Steps:

• List item
• Create a project called Nav.
• Create a new UIViewController BaseViewController (with XIB) and FirstViewController (with XIB).

• In the NavAppDelegat.h define baseController variable

  @interface NavAppDelegate : NSObject <UIApplicationDelegate> {
  BaseViewController *baseController;
  }
  @property (nonatomic, retain) IBOutlet BaseViewController *baseController; 
  

• In the NavAppDelegat.m add baseController to the window:

  @synthesize baseController;
  (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
  [self.window addSubview:baseController.view];
  [self.window makeKeyAndVisible];
  return YES;
  }
  

• Open the BaseViewController.xib file and add UINavigationController, set its Root View Controller class and XIB to FirstViewController (in the inspector).

• Also connect navigationController variable with the UINavigationController.

I believe this should show me the FirstViewController with the navigation bar. If I do this directly on the MainWindow.xib things are working as I expected but here I can't see the navigation bar. What am I missing? THx!

UPDATE: So the problem is only that in case I use UINavigationController inside some additional controller (BaseViewController.xib here) instead of MainWindow.xib i don't see the navigation bar.

回答1:

I can't tell if you're trying to connect your navigation controller directly to your window, just from a second XIB (which should work) or if you're making your navigation controller a subview of another view, which won't work.

UINavigationController is only intended to be used as either the primary subview of a UIWindow or as a subview of a UITabController. Apple doesn't want you embedding a navigation controller in other contexts.

See Combined View Controller Interfaces in the View Controller Programming Guide for more details.

来源：https://stackoverflow.com/questions/4761935/iphone-uinavigationcontroller-inside-uiviewcontroller