以编程方式将UIBarButtonItem添加到UITabBarController内的所有导航视图控制器 [英] Adding UIBarButtonItem to all Navigation View Controllers inside a UITabBarController programmatically

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.

    推荐答案

    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?

    这篇关于以编程方式将UIBarButtonItem添加到UITabBarController内的所有导航视图控制器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！