将UIBarButtonItem添加到UINav..Controller [英] Adding UIBarButtonItem to UINav..Controller

问题描述

我不确定我在这里缺少什么。我有一个自定义的 UINavigationController ，我正在尝试向栏中添加一个持久的 UIBarButtonItem 。

i am not sure what i am missing here. I Have a custom UINavigationController and i am trying to add a persistant UIBarButtonItem to the bar.

-(void)viewDidLoad
{
    self.navigationBar.barStyle = UIBarStyleBlack;
    UIBarButtonItem *bbi = [[UIBarButtonItem alloc] initWithTitle:@"Nope..."
               style:UIBarButtonItemStyleBordered
                 target:self
                 action:@selector(goBack:)]; 
    self.navigationItem.leftBarButtonItem =bbi;
    [bbi release]; 
}
-(void)goBack:(id)sender
{
    NSLog(@"go back now");
}

我在这里缺少什么？ - 顺便说一句，我不想​​/不会使用IB。

what am i missing here? - BTW, i do not want to/ will not use IB.

更新：
目前这是我能得到的最接近的：

UPDATE: Currently this is the closest i can get:

-(void)viewDidLoad
{
    self.navigationBar.barStyle = UIBarStyleBlack;
    UINavigationBar *navBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 20, 320, 44)];
    navBar.barStyle = UIBarStyleBlack;
    UINavigationItem *navItem = [[UINavigationItem alloc] initWithTitle:@"Currently Playing..."];
    [navBar pushNavigationItem:navItem animated:NO];
    UIBarButtonItem *editButton = [[UIBarButtonItem alloc] initWithTitle:@"Close" style:UIBarButtonItemStyleBordered target:self action:@selector(goBack:)];
    navItem.rightBarButtonItem = editButton;

    [self.view addSubview:navBar];

    [editButton release];
    [navItem release];
    [navBar release]; 
    [super viewDidLoad];
}

我必须将整个导航栏添加到 UINavigationController 已经有一个导航栏....如果我尝试使用现有的，我会收到此错误：

It's terrible i have to add an entire navbar to a UINavigationController that already has a navbar....if i try to use the existing, i get this error:

'NSInternalInconsistencyException', reason: 'Cannot call pushNavigationItem:animated: directly on a UINavigationBar managed by a controller.'

....真的???

....really???

推荐答案

navigationItem 不得在UINavigationController实例上设置，但在视图上在导航控制器内部显示的视图的控制器。

navigationItem must not be set on the UINavigationController instance but on the view controller of the view which is displayed "inside" the navigation controller.

如果您的控制器本身被推入另一个导航控制器，则在导航控制器上设置self.navigationItem将起作用。

Setting self.navigationItem on your navigation controller would work if your controller was itself pushed into another navigation controller.

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