Question

我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，最初显示标签栏，它在视图中有五个标签栏项目。使用标签栏，选择最初的第一个标签项。现在我想更改所选项目，例如，最初选择第四项。（见图）
我如何实现这一目标？

我的代码在这里，

    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];

见下图。我想要这样，

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

请指导我。

感谢。

Answer 1

试试这个：

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

或

tBar.selectedIndex = 3;

Answer 2

如果您想以编程方式从项目更改为另一项，您也可以这样做：

[self parentViewController].yourTabBar.selectedIndex = 3;

我希望这有助于某人

如何更改iPhone中Tabbar中选定的标签项？

2 个答案: