iphone - iPhone - 从 xib 加载视图控制器时忽略 UINavigationItem

Question

我有一个UIViewControllerwithin a UINavigationController，我正在UIViewController从一个 XIB 文件将一秒钟推到导航堆栈上。此 XIB 还包括UINavigationItem用于第二个视图控制器的标题和按钮，但在加载 XIB 时会忽略这些。有任何想法吗？

这是我的代码（photoViewController 是第二个 viewController）

- (void) displayPhotoWithId:(int)photoId {

    if (_photoViewController == nil) {
        self.photoViewController = [[[PhotoViewController alloc] initWithNibName:@"PhotoView" bundle:[NSBundle mainBundle]] autorelease];        
    }

    _photoViewController.photoId = photoId;

    [self.navigationController pushViewController:_photoViewController animated:YES]; 

}

Answer 1

You can wire this up from interface builder. Add something like this to your view controller:

IBOutlet UINavigationItem* navigationItem;

Then wire it up to the view controller outlets (from File Owner, presumably, to the UINavigationItem in your XIB). I have done this and it works fine. I suppose UINavigationController looks for the 'navigationItem' automagically.

Answer 2

导航项被忽略，因为它与这个控制器无关，它只是碰巧在这个控制器的 XIB 中。控制器的导航项是在实例化时创建的。您必须在代码中设置标题和导航按钮（viewDidLoad例如），因为控制器没有navigationItem插座。XIB 中的 UINavigationItem 仅在 UINavigationController 的根控制器内工作。