标签栏项目未正确显示

Question

图 1 显示了在应用程序启动时加载的动态创建的标签栏控制器：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    autoMagically = [[AutoMagically alloc] initWithNibName:nil bundle:nil];

    [self.window addSubview:autoMagically.view];
    [self.window makeKeyAndVisible];

    return YES;
}

如果我通过单击视图上的按钮来加载它（我想要并且需要这样做的方式），我会得到上图图 2 所示的内容：

-(void) loadWhenClicked{
AutoMagically  *todaysDeal = [[AutoMagically alloc] initWithNibName:nil bundle:nil];
    todaysDeal.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
    [self presentModalViewController:todaysDeal animated:YES];
    [todaysDeal release];

}

这是我创建标签栏的代码：

tabBarController = [[UITabBarController alloc] init];

FirstViewController* vc1 = [[FirstViewController alloc] init];

SecondViewController* vc2 = [[SecondViewController alloc] init];

vc1.title = @"Dallas";//[[NSUserDefaults standardUserDefaults] objectForKey:@"Citynamefrmhome"];
vc1.tabBarItem.image = [UIImage imageNamed:@"Dealss.png"];

vc2.title = @"My Vouchers";
vc2.tabBarItem.image = [UIImage imageNamed:@"nav_voucher_S.png"]; 

NSArray* controllers = [NSArray arrayWithObjects:vc1,vc2, nil];

tabBarController.viewControllers = controllers;

[self.view addSubview:tabBarController.view];

当我像其他视图一样加载标签栏控制器时，如何使标签栏控制器正确显示，如图 1 所示？ 这是一个使用 xcode 4 的基于 iphone 视图的应用程序。

Answer 1

所以问题是 UITabController 是一个视图控制器，所以它并不是你想用 addSubview 添加到显示中的东西（因为它不是一个视图）。相反，修改你的代码来做到这一点，你会没事的：

UITabBarController *todaysDeal = [[UITabBarController alloc] init];

FirstViewController* vc1 = [[FirstViewController alloc] init];

SecondViewController* vc2 = [[SecondViewController alloc] init];

vc1.title = @"Dallas";//[[NSUserDefaults standardUserDefaults] objectForKey:@"Citynamefrmhome"];
vc1.tabBarItem.image = [UIImage imageNamed:@"Dealss.png"];

vc2.title = @"My Vouchers";
vc2.tabBarItem.image = [UIImage imageNamed:@"nav_voucher_S.png"]; 

NSArray* controllers = [NSArray arrayWithObjects:vc1,vc2, nil];

todaysDeal.viewControllers = controllers;

todaysDeal.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentModalViewController:todaysDeal animated:YES];
[todaysDeal release];

希望这会有所帮助。