- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];        UITabBarController *tabBarController = [[UITabBarController alloc] init];        FirstViewController *one = [[FirstViewController alloc] init];    one.title=@"联系人";    one.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemContacts tag:0];    UINavigationController *navFirst = [[UINavigationController alloc] initWithRootViewController:one];    [tabBarController addChildViewController:navFirst];        SecondViewController *two = [[SecondViewController alloc] init];    two.title=@"收藏";    two.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:1];    UINavigationController *navSecond = [[UINavigationController alloc] initWithRootViewController:two];    [tabBarController addChildViewController:navSecond];        self.window.rootViewController=tabBarController;        self.window.backgroundColor = [UIColor whiteColor];    [self.window makeKeyAndVisible];    return YES;}

- (void)viewDidLoad{    [super viewDidLoad];        UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(selectRightAction:)];    self.navigationItem.rightBarButtonItem = rightButton;}-(void)selectRightAction:(id)sender{    ChildViewController *childViewController;    childViewController =[[ChildViewController alloc] initWithNibName:@"ChildViewController" bundle:nil];    childViewController.title=@"添加联系人";    [self.navigationController pushViewController:childViewController animated:YES];}