导航栏与标签栏并存的实现

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- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    FirstViewController *mainViewController = [[FirstViewController alloc] init];SecondViewController *searchViewController = [[SecondViewController alloc] init];mainViewController.title = @"首页";searchViewController.title = @"搜索";UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:mainViewController];UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:searchViewController];[mainViewController release];[searchViewController release];NSMutableArray *controllers = [[NSMutableArray alloc] init];[controllers addObject:nav];[controllers addObject:nav1];[nav release];[nav1 release];tabBarController.viewControllers = controllers;tabBarController.selectedIndex = 0;[self.window addSubview:tabBarController.view];[self.window makeKeyAndVisible];    [controllers release];return YES;}