How to Navigate from one view to another view in ios? - ios

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