Question

我对iOS应用程序开发相对较新。目前我正在开发一个带标签栏的小应用程序。我面临的问题是我希望在foreach选项卡中有不同的导航项。我尝试了很多东西，但事情并没有奏效。我使用原生iOS语言进行编程。

在我的应用程序中，我有一个AppDelegate。在我的AppDelegate中，有一小段代码用于设置我的mainViewController：

- (void)setupOverlordViewController
{
    MainViewController *rootVC = [[MainViewController alloc] initWithNibName:nil bundle:nil];
    UINavigationController *navVC = [[UINavigationController alloc] initWithRootViewController:rootVC];
    self.window.rootViewController = navVC;
}

我在MainViewController中设置我的标签：

- (void)viewDidLoad
{
    UIViewController *tabView1 = [[Tab1ViewController alloc] init];
    UIViewController *tabView2 = [[Tab2ViewController alloc] init];
    UIViewController *tabView3 = [[Tab3ViewController alloc] init];

    NSMutableArray *tabViewControllers = [[NSMutableArray alloc] init];
    [tabViewControllers addObject:tabView1];
    [tabViewControllers addObject:tabView2];
    [tabViewControllers addObject:tabView3];

    [self setViewControllers:tabViewControllers];

    tabView1.tabBarItem =
    [[UITabBarItem alloc] initWithTitle:NSLocalizedString(@"TabView1", nil)
                                  image:[UIImage imageNamed:@"tabView1.png"]
                                    tag:1];

    tabView2.tabBarItem =
    [[UITabBarItem alloc] initWithTitle:NSLocalizedString(@"TabView2", nil)
                                  image:[UIImage imageNamed:@"tabView2.png"]
                                    tag:2];
    tabView3.tabBarItem =
    [[UITabBarItem alloc] initWithTitle:NSLocalizedString(@"TabView3", nil)
                                  image:[UIImage imageNamed:@"tabView3.png"]
                                    tag:3];
}

每个视图（tabView1，tabView2，tabView3）都有自己的布局，在View的ViewDidLoad方法中设置。当我想通过在ViewDidLoad方法中添加导航按钮时在导航栏中添加导航按钮，但似乎无法添加按钮。添加它们的唯一方法是直接在我的MainViewController中，但是我不能将导航栏按钮设置为不同的foreach选项卡。

将按钮添加到导航栏的代码如下：

UIBarButtonItem *btnNewRecord = [[UIBarButtonItem alloc]     initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self      action:@selector(btnNewRecord)];


NSArray *rightItems = [NSArray arrayWithObjects:btnNewRecord, nil];
[self.navigationItem setRightBarButtonItems:rightItems];

有人可以解释一下我做错了吗？

Answer 1

我已经使用xib文件为您创建了一个示例。我创建了三个视图控制器并将它们添加到导航控制器。遵循appdelegate代码：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    FirstViewController *firstVC = [[FirstViewController alloc] initWithNibName:@"FirstView" bundle:nil];
    UINavigationController *firstNavVC = [[UINavigationController alloc] initWithRootViewController: firstVC];

    SecondViewController *secondVC = [[SecondViewController alloc] initWithNibName:@"SecondView" bundle:nil];
    UINavigationController *secondNavVC = [[UINavigationController alloc] initWithRootViewController: secondVC];

    ThirdViewController *thirdVC = [[ThirdViewController alloc] initWithNibName:@"ThirdView" bundle:nil];
    UINavigationController *thirdNavVC = [[UINavigationController alloc] initWithRootViewController: thirdVC];

    NSMutableArray *tabViewControllers = [[NSMutableArray alloc] init];
    [tabViewControllers addObject:firstNavVC];
    [tabViewControllers addObject:secondNavVC];
    [tabViewControllers addObject:thirdNavVC];

    firstNavVC.tabBarItem =
    [[UITabBarItem alloc] initWithTitle:NSLocalizedString(@"First", nil)
                                  image:nil
                                    tag:1];

    secondNavVC.tabBarItem =
    [[UITabBarItem alloc] initWithTitle:NSLocalizedString(@"Second", nil)
                                  image:nil
                                    tag:2];
    thirdNavVC.tabBarItem =
    [[UITabBarItem alloc] initWithTitle:NSLocalizedString(@"Third", nil)
                                  image:nil
                                    tag:3];

    UITabBarController *tabbarController = [[UITabBarController alloc] init];
    tabbarController.viewControllers = tabViewControllers;

    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    self.window.rootViewController = tabbarController;

    [self.window makeKeyAndVisible];

    return YES;
}

以下是输出：

enter image description here

您可以下载代码示例here

Answer 2

每个标签栏视图控制器都需要单独的导航控制器。然后你可以在每个导航控制器上添加UIBarButtonItem。

iOS 7：标签栏控制器的不同导航项

2 个答案: