uitabbar controller中标题显示的问题

使用以下代码创建了uitabbarview controller
在uitabbarview controller中我想为每一个视图显示标题
怎么样为每个视图添加标题呢（标题栏项目）？

myTabBarController = [[UITabBarController alloc] init];

    MyDialerViewController *aDialerViewController = [[MyDialerViewController alloc]init];
    MyCallLogViewController *aCallLogViewController = [[MyCallLogViewController alloc] init];
    TemplateViewController *aTemplateViewController = [[TemplateViewController alloc] init];    


    NSArray* controllers = [NSArray arrayWithObjects:aDialerViewController, aCallLogViewController, aTemplateViewController, nil];
    myTabBarController.viewControllers = controllers;
    myTabBarController.delegate = self;
    myTabBarController.selectedIndex = 0;

    [controllers release];
    [aDialerViewController release];
    [aCallLogViewController release];
    [aTemplateViewController release];

    [self.window addSubview:myTabBarController.view];

    [self.window makeKeyAndVisible];

在appDelegate里面直接设置navcontroller的标题。同时也在viewcontroller里面的viewDidLoad 中设置。

aDialerViewController.title = NSLocalizedString(@"Dialer Title", @"Dialer Title");
aCallLogViewController.title = @"Title";
aTemplateViewController.title = @"Title";

self.viewcontroller.tabBarItem = // a UITabBarItem instance

给UITabBarItem实例化一个实例。
要在每一个 viewcontroller的初始化函数里写入：

(id)initWithTitle:(NSString *)title image:(UIImage *)image tag:(NSInteger)tag