在我的应用程序中，我有 4 个选项卡，在第一个选项卡上：我有 4 个视图。在第二个视图中，有一个按钮可以打开第三个选项卡视图。但我选择的标签索引是一个。我怎样才能把它改成第三。
我的标签栏代码在 APPDelegate 中，如下所示：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
UINavigationController *nav1 = [[UINavigationController alloc] init];
UIViewController *viewController1 = [[[CarAccidentAppViewController alloc]
initWithNibName:@"CarAccidentAppViewController_iPhone" bundle:nil]
autorelease];
nav1.viewControllers = [NSArray arrayWithObjects:viewController1, nil];
//for steps tab...
UINavigationController *nav2 = [[UINavigationController alloc] init];
UIViewController *viewController2 = [[[FirstSteps alloc] initWithNibName:@"FirstSteps" bundle:nil] autorelease];
nav2.viewControllers = [NSArray arrayWithObjects:viewController2, nil];
//for profiles tab...
UINavigationController *nav3 = [[UINavigationController alloc] init];
UIViewController *viewController3 = [[[Profiles alloc] initWithNibName:@"Profiles" bundle:nil] autorelease];
nav3.viewControllers = [NSArray arrayWithObjects:viewController3, nil];
//for contact us tab...
UINavigationController *nav4 = [[UINavigationController alloc] init];
UIViewController *viewController4 = [[[ContactUs alloc] initWithNibName:@"ContactUs" bundle:nil] autorelease];
nav4.viewControllers = [NSArray arrayWithObjects:viewController4, nil]; self.tabBarController = [[[UITabBarController alloc] init]
autorelease];
self.tabBarController.viewControllers = [NSArray arrayWithObjects:nav1,nav2,nav3,nav4 ,nil];
self.window.rootViewController=self.tabBarController;
[self.window makeKeyAndVisible];
return YES;
}