将UITabBarController推入UInavigationController

Question

我有一个UINavigationController作为应用程序的根视图控制器。

在某些时候，我需要使用特定选项卡推送UITabController。

到此为止，一切都正常。

但是，在选项卡视图控制器中，我无法访问UINavigationController navBar（更改标题，色调等）。

这是我的推送方式：

SCTabController *TabController = [[SCTabController alloc] init];
[self.navigationController pushViewController:TabController animated:YES];

SCTabController是UITabController的子类，具有以下viewDidLoadMethod：

- (void)viewDidLoad {
    [super viewDidLoad];

    UIViewController *view1 = [[UIViewController alloc] init];
    UIViewController *view2 = [[UIViewController alloc] init];
    UIViewController *view3 = [[UIViewController alloc] init];
    UIViewController *view4 = [[UIViewController alloc] init];

    NSMutableArray *tabViewControllers = [[NSMutableArray alloc] init];
    [tabViewControllers addObject:view1];
    [tabViewControllers addObject:view2];
    [tabViewControllers addObject:view3];
    [tabViewControllers addObject:view4];

    [self setViewControllers:tabViewControllers];
    //can't set this until after its added to the tab bar
    bankHomeViewController.tabBarItem =
            [[UITabBarItem alloc] initWithTitle:@"Title1"
                                          image:nil
                                            tag:1];
    view2.tabBarItem =
            [[UITabBarItem alloc] initWithTitle:@"Title2"
                                          image:nil
                                            tag:2];
    view3.tabBarItem =
            [[UITabBarItem alloc] initWithTitle:@"Title3"
                                          image:nil
                                            tag:3];
    view4.tabBarItem =
            [[UITabBarItem alloc] initWithTitle:@"Title4"
                                          image:nil
                                            tag:4];

Answer 1

在我的项目中，我这样做是：

Answer 2

添加UITabBarControllerDelegate

@interface SCTabController : UITabBarController<UITabBarControllerDelegate>

@end

然后在SCTabController.m中的viewDidLoad中添加以下代码

self.delegate = self;

在SCTabController.m中实现UITabBarControllerDelegate didSelectViewController

-(void) tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
    //Write your code here
    //NSLog(@"%lu", (unsigned long)self.selectedIndex);

    UILabel *functionTitleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 0.0, 190, 50)];
    [functionTitleLabel setTextAlignment:NSTextAlignmentCenter];

    switch (self.selectedIndex) {
        case 0:
            [functionTitleLabel setText:@"title1"];
            break;
        case 1:
            [functionTitleLabel setText:@"title2"];
            break;
        case 2:
            [functionTitleLabel setText:@"title3"];
            break;
        default:
            [functionTitleLabel setText:@"title4"];
            break;
    }

    self.navigationItem.titleView = functionTitleLabel;
}