以编程方式将UIBarButtonItem添加到UITabBarController内的所有导航视图控制器

问题描述：

结构如下：

查看

标签栏控制器

导航控制器

查看控制器

查看控制器

查看控制器

查看控制器

查看控制器

查看控制器

以上控制器已在界面构建器中初始化。

The above controllers have been initialised in interface builder.

我要做的是向每个导航控制器添加一个正确的 UIBarButtonItem ，但没有取得任何成功。

What I'm trying to do is add a right UIBarButtonItem to each navigation controller but not having any success.

以下是我的尝试：

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.view.backgroundColor = [UIColor clearColor];
    self.view.opaque = NO;
    self.tabBarController.view.frame = self.view.bounds;

    NSArray *currentViewControllers = self.tabBarController.viewControllers;
    NSMutableArray *updatedViewControllers = [NSMutableArray array];

    for (int i=0; i<currentViewControllers.count; i++) {
        UINavigationController *tempNav = [[UINavigationController alloc]init];
        tempNav = [currentViewControllers objectAtIndex:i];
        UIBarButtonItem *dismissButton = [[UIBarButtonItem alloc] 
                                          initWithTitle:@"Done"                                            
                                          style:UIBarButtonItemStyleBordered 
                                          target:self 
                                          action:@selector(dismissLibraryBrowser)];
        tempNav.navigationItem.rightBarButtonItem = dismissButton;
        [updatedViewControllers addObject:tempNav];
        [dismissButton release];
        [tempNav release];

        NSLog(@"Added controller number %d",i);
    }

    self.tabBarController.viewControllers = [NSArray arrayWithArray:updatedViewControllers];

    [self.view addSubview:tabBarController.view];
}

代码执行时没有任何错误，但按钮没有出现。我确定我在这里误解了一些东西。非常感谢一些指导。

The code executes without any errors, but the button doesn't appear. I'm sure I've misunderstood something here. Would appreciate some guidance.

答

通过重新创建viewControllers和临时数组，你会稍微复杂化一些事情。你只需要操作从笔尖加载的对象

You are over complicating things slightly with recreating viewControllers and temporary arrays. You just need to manipulate the objects loaded from the nib

[self.tabBarController.viewControllers enumerateObjectsUsingBlock:^(UINavigationController *navigationController, NSUInteger idx, BOOL *stop) {

    UIViewController *rootViewController = [navigationController.viewControllers objectAtIndex:0];

    UIBarButtonItem *rightBarButtonItem  = 
      [[UIBarButtonItem alloc] initWithTitle:@"Done"                                            
                                       style:UIBarButtonItemStyleBordered 
                                      target:self 
                                      action:@selector(dismissLibraryBrowser)];

    rootViewController.navigationItem.rightBarButtonItem = rightBarButtonItem;

 }];

至于你的应用程序的结构 - 文档对于 UITabBarController 说

部署标签栏界面时，必须将此视图安装为窗口的根目录。与其他视图控制器不同，标签栏界面不应该作为另一个视图控制器的子节点安装。

When deploying a tab bar interface, you must install this view as the root of your window. Unlike other view controllers, a tab bar interface should never be installed as a child of another view controller.

所以我建议有一个看看重组一些东西，如果你只是偶尔需要它，为什么不考虑以模态方式呈现呢？

So I would suggest having a look at restructuring some stuff, if you need it only occasionally why not consider presenting it modally?

以编程方式将UIBarButtonItem添加到UITabBarController内的所有导航视图控制器

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