如何在ios中从一个视图导航到另一个视图？

Question

I have tab bar with 4 options.
In the 1st tab, I have a button. When i click this button, I have to move from one view to another view in second tab bar.

the code I am currently using is ( where shipVC is the second tab's viewController ):

[shipVC.navigationController pushViewController:cartVC animated:NO];

So basically, When the button in the 1st tab viewController is pressed, I want to move from 'X' view to 'Y' view in the 2nd tab's viewController

Answer 1

One quick way to do this is by using NSNotificationCenter to post a notification when the button in the first tab's viewController is pressed.

Steps:

1. in the 2nd tab's viewController 's -viewDidLoad method:
   • Add a notification observer and set a target selector method to it
2. in the 1st tab's viewController 's button method:
   • Post the notification

Example:

Your 2nd tab's viewController class:

-(void)viewDidLoad {
    [super viewDidLoad];

    [NSNotificationCenter defaultCenter] addObserver:self
                                            selector:@selector(doTheNavigation)
                                                name:@"AnyNameYouWantForNotification"
                                              object:nil];
}

-(void)doTheNavigation {
    [self.navigationController pushViewController:cartVC animated:NO];
    //WARNING: don't just push, put a check  or else repeated click on the
    //button in the 1st tab will push cartVC again and again.
    //This will not only warrant a crash but look very ugly
}

---

Button method in the 1st tab's viewController class:

-(IBAction)someBtnClick:(UIButton *)sender {
    //...
    //you can use this to post a notification from anywhere now
    [[NSNotificationCenter defaultCenter] postNotificationName:@"AnyNameYouWantForNotification" 
                                                        object:nil];
    //...
}

---

So...

• When the button in the 1st tab is clicked, the button action ( that I named someBtnClick ) will post a notification with the name AnyNameYouWantForNotification
• The 2nd tab ( should be already loaded and ready ) will be listening for a notification that has AnyNameYouWantForNotification as it's name.
  • When this notification is received, it will execute the linked selector method ( that I named doTheNavigation )

Answer 2

check my answer

-(void)settabbar{

        UIViewController *viewController1 = [[[viewController1 alloc] initWithNibName:@"viewController1" bundle:nil] autorelease];
        UIViewController *viewController2 = [[[viewController2 alloc] initWithNibName:@"viewController2" bundle:nil] autorelease];
        UIViewController *viewController3 = [[[viewController3 alloc] initWithNibName:@"viewController3" bundle:nil] autorelease];


        navControl1=[[UINavigationController alloc]initWithRootViewController:viewController1];
        navControl2=[[UINavigationController alloc]initWithRootViewController:viewController2];
        navControl3=[[UINavigationController alloc]initWithRootViewController:viewController3];

        navControl1.navigationBar.tintColor=[UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.8];
        navControl2.navigationBar.tintColor=[UIColor blackColor];
        navControl3.navigationBar.tintColor=[UIColor blackColor];

        self.tabBarController = [[[UITabBarController alloc] init] autorelease];
        self.tabBarController.delegate=self;
        self.tabBarController.viewControllers = [NSArray arrayWithObjects:navControl1,navControl2,navControl3, nil ];

        [[[[self.tabBarController tabBar] items] objectAtIndex:2] setFinishedSelectedImage:[UIImage imageNamed:@""] withFinishedUnselectedImage:[UIImage imageNamed:@""]];
        [[[[self.tabBarController tabBar] items] objectAtIndex:0] setTitle:@"view1"];
        [[[[self.tabBarController tabBar] items] objectAtIndex:0] setImage:[UIImage imageNamed:@"tab2.png"]];
        [[[[self.tabBarController tabBar] items] objectAtIndex:1] setTitle:@"view2"];
        [[[[self.tabBarController tabBar] items] objectAtIndex:1] setImage:[UIImage imageNamed:@"tab11.png"]];
        [[[[self.tabBarController tabBar] items] objectAtIndex:2] setTitle:@"ciew3"];
        [[[[self.tabBarController tabBar] items] objectAtIndex:2] setImage:[UIImage imageNamed:@"tab5.png"]];
        [[[[self.tabBarController tabBar] items] objectAtIndex:3] setTitle:@"Maintain Customer"];
        [[[[self.tabBarController tabBar] items] objectAtIndex:3] setImage:[UIImage imageNamed:@"tab4.png"]];

        [self.tabBarController.tabBar setSelectionIndicatorImage:[UIImage imageNamed:@"trans.png"]];

        UIImage* tabBarBackground = [UIImage imageNamed:@""];
        [[UITabBar appearance] setBackgroundImage:tabBarBackground];
        [[UITabBar appearance] setSelectionIndicatorImage:[UIImage imageNamed:@"trans.png"]];
    }

    -(BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController*)viewController{

        NSLog(@"select : %d",tabBarController.tabBar.selectedItem.tag);

        if(self.tabBarController.tabBar.selectedItem.tag==0){
            [[self.tabBarController.viewControllers objectAtIndex:0] popViewControllerAnimated:YES];
        }else if(self.tabBarController.tabBar.selectedItem.tag==1){
            [[self.tabBarController.viewControllers objectAtIndex:1] popViewControllerAnimated:YES];
        }else if(self.tabBarController.tabBar.selectedItem.tag==2){
            [[self.tabBarController.viewControllers objectAtIndex:2] popViewControllerAnimated:YES];
        }else {
            [(UINavigationController*) viewController popToRootViewControllerAnimated:YES];
        }

        return YES;

    }

Answer 3

You need to also make application with Naigationcontroller in your appdelegate

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


 HomeViewController *homeView = [[HomeViewController alloc]        initWithNibName:@"HomeViewController" bundle:[NSBundle mainBundle]];

[self.navigationController pushViewController:homeView animated:YES];
UINavigationController *navController=[[UINavigationController alloc]initWithRootViewController:homeView];

self.window.rootViewController = navController;
[self.window makeKeyAndVisible];

after that your navigationbar will appear in your first viewcontroller then you can navigate.