如何更改iphone中Tabbar中的选定选项卡项？

Question

我已经在视图控制器中以编程方式创建了标签栏。在我的应用程序中，初始显示标签栏，并在视图中有五个标签栏项目。使用标签栏，最初选择第一个标签项目。现在我想改变选择的项目，第四项最初被选中。（见图）
我该如何做到这一点？

这里我的代码，

tBar = [[UITabBarController alloc] init]; 

    first = [[first alloc] initWithNibName:@"first" bundle:nil]; 

    UINavigationController *navFirst = [[[UINavigationController alloc] initWithRootViewController:first] autorelease]; 

    second = [[second alloc] initWithNibName:@"second" bundle:nil]; 

    UINavigationController *navsecond = [[[UINavigationController alloc] initWithRootViewController:second] autorelease]; 

    third = [[third alloc] initWithNibName:@"third" bundle:nil]; 

    UINavigationController *navthird = [[[UINavigationController alloc] initWithRootViewController:third] autorelease]; 

    fourth = [[fourth alloc] initWithNibName:@"fourth" bundle:nil]; 

    UINavigationController *navfourth = [[[UINavigationController alloc] initWithRootViewController:fourth] autorelease]; 

    fifth = [[fifth alloc] initWithNibName:@"fifth" bundle:nil]; 

    UINavigationController *navfifth= [[[UINavigationController alloc] initWithRootViewController:fifth] autorelease]; 

    tBar.viewControllers = [NSArray arrayWithObjects:navFirst,navsecond, navthird, navfourth, navfifth,nil]; 

    [self.view addSubview:tBar.view]; 

    [self.navigationController pushViewController:tBar animated:NO]; 

见下面的图片。我想正是这样，

image http://www.freeimagehosting.net/uploads/2798661c55.png

请指引我。

谢谢。

Answer 1

试试这个：

YourAppNameDelegate *appDelegate = (YourAppNameDelegate *)[[UIApplication sharedApplication] delegate]; 
[appDelegate tabBarController].selectedIndex = 3; 

或

tBar.selectedIndex = 3; 

Answer 2

如果你想从另一个一个项目更改程序，你也可以这样做：

[self parentViewController].yourTabBar.selectedIndex = 3; 

我希望这有助于有人