从标签栏控制器触发导航控制器中的视图控制器

Question

我有一个包含 5 个导航控制器的标签栏控制器的应用。 Each nav controller has a menu as the first view controller however when the tab is selected I want to bypass the menu and go to the next view controller.

流程：

TabBar 控制器 -> 导航控制器 -> 菜单 -> 视图控制器 1 -> 视图控制器（级别 2）

              -> Nav Controller -> Menu -> View Controller 2 -> View Controller (level 2)

              -> Nav Controller -> Menu -> View Controller 3 -> View Controller (level 2)

              -> Nav Controller -> Menu -> View Controller 4 -> View Controller (level 2)

Answer 1

当标签栏被点击时，您可以使用 NSNotificationCenter 将通知发布到您的视图控制器。要设置此机制，您必须在您的第一个视图控制器中执行此操作。

#import "FirstViewController.h"

@interface FirstViewController ()<UITabBarControllerDelegate>

@end

@implementation FirstViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.tabBarController.delegate = self;
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
    if (((UINavigationController *)viewController).topViewController == self) {

        //Push the next view controller to skip the menu
        //Replace newViewController with the disired one
        UIViewController *newViewController = [UIViewController new];
        [self.navigationController pushViewController:newViewController animated:NO];

        NSLog(@"Push view controller first tab");

    }else {
        //Post a notification to inform the other view Controller
        [[NSNotificationCenter defaultCenter]postNotificationName:@"tabBarControllerDidSelectViewController" object:((UINavigationController *)viewController)];
    }
}


@end

在您的其余视图控制器中执行以下操作

#import "SecondViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(didTabed:) name:@"tabBarControllerDidSelectViewController" object:nil];

    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.     }

-(void)didTabed:(NSNotification *)notification
{
    if ([[notification object] isKindOfClass:[UINavigationController class]]) {

        UIViewController *selectedViewController = ((UINavigationController *)[notification object]).topViewController;

        if (selectedViewController == self) {

            //Push the next view controller to skip the menu
            //Replace newViewController with the disired one
            UIViewController *newViewController = [UIViewController new];
            [self.navigationController pushViewController:newViewController animated:NO];

            NSLog(@"Push view Controller tap2");
        }

   }
}

@end

如果您对此有任何疑问，请不要犹豫！

希望这会有所帮助。