iOS tabbar 控制器基本使用

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 RootViewController *rootVC=[[RootViewController alloc] init]        SignInViewController *signVC = [[SignInViewController alloc]init];    //如果在這裡指定tabitem標題，則在FirstViewController中指定self.tabBarItem.title則不生效    signVC.title = @"打卡";    UITabBarItem *signItem = [[UITabBarItem alloc]initWithTitle:@"打卡" image:nil tag:1];    [signItem setFinishedSelectedImage:[UIImage imageNamed:@"p1"] withFinishedUnselectedImage:[UIImage imageNamed:@"p1_f"]];    signVC.tabBarItem = signItem;        TextViewController *textVC = [[TextViewController alloc]init];    signVC.title = @"備忘";    UITabBarItem *textItem = [[UITabBarItem alloc]initWithTitle:@"備忘" image:nil tag:2];    [textItem setFinishedSelectedImage:[UIImage imageNamed:@"p1"] withFinishedUnselectedImage:[UIImage imageNamed:@"p1_f"]];    textVC.tabBarItem = textItem;        VisitViewController *visitVC = [[VisitViewController alloc]init];    visitVC.title = @"拜訪";    UITabBarItem *visitItem = [[UITabBarItem alloc]initWithTitle:@"拜訪" image:nil tag:3];    [visitItem setFinishedSelectedImage:[UIImage imageNamed:@"p1"] withFinishedUnselectedImage:[UIImage imageNamed:@"p1_f"]];    visitVC.tabBarItem = visitItem;    //構建UITabBarController並指定代理為本身    self.tabBarController = [[UITabBarController alloc]init];    self.tabBarController.delegate = self;        //為UITabBarController添加TabBarItem    self.tabBarController.viewControllers = [NSArray arrayWithObjects:textVC,signVC,visitVC, nil];    //設定選中哪個tab    [self.tabBarController setSelectedIndex:1];    self.window.backgroundColor = [UIColor whiteColor];    //指定根視圖    self.window.rootViewController  = self.tabBarController;