objective-c iPhone：设置导航栏标题
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iPhone: Setting Navigation Bar Title
提问by Arthur Skirvin
Hey all. I'm still pretty new to iPhone development, and I'm having a bit of trouble figuring out how to change the title of my Navigation Bar. On another question on this site somebody recommended using :
大家好。我对 iPhone 开发还是很陌生，我在弄清楚如何更改导航栏的标题时遇到了一些麻烦。在本网站上的另一个问题上，有人建议使用：
viewController.title = @"title text";
but that isn't working for me...Do I need to add a UINavigationController to accomplish this? Or maybe just an outlet from my UIViewController subclass? If it helps, I defined the navigation bar in IB and I'm trying to set its title in my UIViewController subclass. This is another one of those simple things that gives me a headache. Putting self.title = @"title text"; in viewDidLoadand initWithNibNamedidn't work either. Anybody know what's happening and how to get it happening right?
但这对我不起作用......我需要添加一个 UINavigationController 来完成这个吗？或者也许只是我 UIViewController 子类的一个出口？如果有帮助，我在 IB 中定义了导航栏，并尝试在我的 UIViewController 子类中设置其标题。这是另一件让我头疼的简单事情。把 self.title = @"title text"; 在viewDidLoad，initWithNibName也没有工作。有谁知道发生了什么以及如何让它正确发生？
Thanks!
谢谢！
回答by kennytm
The view controller must be a child of some UINavigationController for the .titleproperty to take effect. If the UINavigationBar is simply a view, you need to push a navigation item containing the title, or modify the last navigation item:
视图控制器必须是某个 UINavigationController 的子级，.title属性才能生效。如果 UINavigationBar 只是一个视图，则需要推送一个包含标题的导航项，或者修改最后一个导航项：
UINavigationItem* item = [[UINavigationItem alloc] initWithTitle:@"title text"];
...
[bar pushNavigationItem:item animated:YES];
[item release];
or
或者
bar.topItem.title = @"title text";
回答by Sorin Antohi
if you are doing it all by code in the viewDidLoadmethod of the UIViewControlleryou should only add self.title = @"title text";
如果您在viewDidLoad方法中通过代码完成所有操作，UIViewController则只应添加self.title = @"title text";
something like this:
像这样：
- (void)viewDidLoad {
[super viewDidLoad];
self.title = @"title";
}
you could also try self.navigationItem.title = @"title";
你也可以试试 self.navigationItem.title = @"title";
also check if your navigationItem is not null and if you have set a custom background to the navigationbar check if the title is set without it.
还要检查您的 navigationItem 是否不为空，以及您是否为导航栏设置了自定义背景，检查标题是否设置为没有它。
回答by Jigish
There's one issue with using self.title = @"title";
使用有一个问题 self.title = @"title";
If you're using Navigation Bar along with Tab bar, the above line also changes the label for the Tab Bar Item. To avoid this, use what @testing suggested
如果您将导航栏与标签栏一起使用，上面的行还会更改标签栏项目的标签。为避免这种情况，请使用@testing 建议的内容
self.navigationItem.title = @"MyTitle";
回答by M.G?kay Borulday
If you want to change navbar title (not navbar back button title!) this code will be work.
如果您想更改导航栏标题（不是导航栏后退按钮标题！），此代码将起作用。
self.navigationController.topViewController.title = @"info";
回答by Pantelis Proios
If you want to change the title of a navBar inside a tabBar controller, do this:
如果要更改 tabBar 控制器内导航栏的标题，请执行以下操作：
-(void)viewDidAppear:(BOOL)animated {
self.navigationController.navigationBar.topItem.title = @"myTitle";
}
回答by testing
In my navigation based app I do this:
在我的基于导航的应用程序中，我这样做：
myViewController.navigationItem.title = @"MyTitle";
回答by ronaldus_magnus
By default the navigation controller displays the title of the 'topitem'
默认情况下，导航控制器显示“topitem”的标题
so in your viewdidload method of your appdelegate you can. I tested it and it works
所以在你的 appdelegate 的 viewdidload 方法中，你可以。我测试了它并且它有效
navController.navigationBar.topItem.title = @"Test";
回答by Sagar Dalwale
I had a navigation controllers integrated in a TabbarController. This worked
我在 TabbarController 中集成了一个导航控制器。这有效
self.navigationItem.title=@"title";
回答by Guy
If you are working with Storyboards, you can click on the controller, switch to the properties tab, and set the title text there.
如果您正在使用 Storyboard，您可以单击控制器，切换到属性选项卡，然后在那里设置标题文本。
回答by rmsh
UINavigationItem* item = [[UINavigationItem alloc] initWithTitle:@"title text"];
...
[bar pushNavigationItem:item animated:YES];
[item release];
This code worked.
此代码有效。
