从UINavigationController设置UITabBarItem标题？ [英] Setting UITabBarItem title from UINavigationController?

问题描述

我设置了一个UITabBarController有两个选项卡，一个是一个简单的UIViewController和另一个是UINavigationController使用第二个UIViewController作为其rootController（这将稍后将用于设置UITableView）。我的问题是关于命名选项卡（即设置每个UITabBarItem的标题）

I have setup a UITabBarController with two tabs, one is a simple UIViewController and the other is a UINavigationController using a second UIViewController as its rootController (this will later be used to setup a UITableView). My question is with regard to naming the tabs (i.e. setting the title of each UITabBarItem)

对于第一个选项卡（简单的UIViewController）我添加了以下to the controllers -init method。

For the first tab (simple UIViewController) I have added the following (see below) to the controllers -init method.

// FROM -[MapController init]
- (id)init {
    self = [super init];
    if(self) {
        UITabBarItem *tabBarItem = [self tabBarItem];
        [tabBarItem setTitle:@"ONE"];
    }
    return self;
}

对于其他选项卡，我已经添加了（rootController）。

For the other tab I have added (see below) to the second controllers init (rootController).

// FROM -[TableController init]
- (id)init {
    self = [super init];
    if(self) {
        UITabBarItem *tabBarItem = [[self navigationController] tabBarItem];
        [tabBarItem setTitle:@"TWO"];
    }
    return self;
}

我设置第二个tabBarItem标题在正确的地方，显示，当我运行应用程序的第一个选项卡一，第二个是空白。

Am I setting the second tabBarItem title in the right place as currently it is not showing, when I run the application the first tab says "ONE" the second is blank. Also tabBarItem (above) shows nil when I print the value or look via the debugger.

EDIT_001：添加了来自AppDelegate的完整代码

当我第一次创建控制器时，我可以从AppDelegate中正确设置UITabBarItem，准备添加到UITabBarController。但是我真的想在个人控制器中使用这种方法 - 整洁的方法。

I can correctly set the UITabBarItem from within the AppDelegate when I first create the controllers, ready for adding to the UITabBarController. But I really wanted to do this in the individual controller -init methods for neatness.

// UITabBarController
UITabBarController *tempRoot = [[UITabBarController alloc] init];
[self setRootController:tempRoot];
[tempRoot release];
NSMutableArray *tabBarControllers = [[NSMutableArray alloc] init];

// UIViewController ONE
MapController *mapController = [[MapController alloc] init];
[tabBarControllers addObject:mapController];
[mapController release];

// UITableView TWO
TableController *rootTableController = [[TableController alloc] init];
UINavigationController *tempNavController = [[UINavigationController alloc] initWithRootViewController:rootTableController];
[rootTableController release];
[tabBarControllers addObject:tempNavController];
[tempNavController release];

[rootController setViewControllers:tabBarControllers];
[tabBarControllers release];

[window addSubview:[rootController view]];
[window makeKeyAndVisible];

EDIT_002：解决方案到目前为止，更新应用程序代理中的UITabBarItems，例如 p>

EDIT_002: Solution so far, Update UITabBarItems in app delegate e.g.

// TABLE CONTROLLER
TableController *tableController = [[TableController alloc] init];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:tableController];
[tableController release];
[tabBarControllers addObject:navController];
UITabBarItem *tabBarItem_002 = [navController tabBarItem];
[tabBarItem_002 setTitle:@"TWO"];
[tabBarItem_002 setImage:[UIImage imageNamed:@"GT_TWO.png"]];
[navController release];

EDIT_003：
是有办法设置UITabBarItem

EDIT_003: is there a way to set the UITabBarItem in the UINavigationController or is the delegate (as it seems) really the best place to do it.

推荐答案

你真的要创建一个tabBarItem自己然后将它分配给视图控制器的tabBarItem属性。请尝试在您的init：

You actually have to create the tabBarItem yourself and then assign it to the view controller's tabBarItem property. Try this in your init:

UITabBarItem *tabBarItem = [[UITabBarItem alloc] initWithTitle:@"TWO"
                                                         image:[UIImage imageNamed:@"GT_TWO.png"]
                                                           tag:0];
self.tabBarItem = tabBarItem;
[tabBarItem release];

希望这有帮助。

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