I have a tab bar with 3 items. Each points to a UINavigationController. Each UINavigationController has several viewControllers beneath. I'm wanting to reset back to the first controller in the navigation when any tab bar item is pressed.
I've specified my TabBarController implementation as a delegate
self.delegate = self and my method below (running in my TabBarController implementation works returning UINavigationControllers.
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
NSLog(#"%#", viewController);
}
With the log file showing e.g.
UINavigationController: 0x8a31a90>2012-12-31 02:16:40.035 Demo[6142:c07]
when I try popToRootViewController or popViewController within this method it doesn't seem to work. I don't get any errors but my viewControllers don't reset. It seems like I've made a really basic error here but I can't tell what.
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
NSLog(#"%#", viewController);
[self.navigationController popToRootViewControllerAnimated:YES];
[[self navigationController] popViewControllerAnimated:YES];
}
You need to popToRootViewController on the navigationController (viewcontroller) - not the TabViewController (self).
[viewController popToRootViewControllerAnimated:YES];
I'm not sure if this will help. I had a lot of trouble getting this to work and found that I needed to do the following:
In root view controller (first view app comes to), add a delegate in the .h file.
#interface MGMProductsViewController : UIViewController <UITabBarControllerDelegate>
Add the below code to viewDidLoad in root view controller (.m file).
[self.tabBarController setDelegate:self];
Override method in root view controller (.m file) with the below.
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
if ([viewController isKindOfClass:[UINavigationController class]])
{
[(UINavigationController*)viewController popToRootViewControllerAnimated:NO];
}
}
I can't attribute this to anyone as I couldn't find the appropriate code again. I think I pieced it together from a few places though the '[self.tabBarController setDelegate:self]' looked to be the key to it working for me.
Good luck.
Related
Let me explain clearly.
I have a tabbarcontoller in the viewcontroller which is the main view controller of the single view application project.
I added a tabbarcontroller to the viewcontroller as the subview. In the tabbarcontroller, I added two navigation controllers like below image,
I have added three(named First, Second, Third) more viewcontrollers as new file.
If I navigate from one viewcontroller to other in a tab using below,
third = [[Third alloc] initWithNibName:#"Third" bundle:[NSBundle mainBundle]];
[self.navigationController pushViewController:third animated:YES];
If I switch to next tab and come back to the previous tab, it should popto the previous view controller, how to do this?
I tried
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:0] animated:YES];
}
not succeed,
I also tried,
[third popto];
In the third viewcontroller,
-(void)popto
{
[self.navigationController popViewControllerAnimated:YES];
}
nothing happened.
Now, I have to click the tab again to poptoviewcontroller to the first viewcontroller.
Any ideas will be highly appreciated.
You should try using
[viewController.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:0] animated:YES];
instead of
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:0] animated:YES];
Try the below code snippet
-(BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController
{
UINavigationController *navController = (UINavigationController*)viewController;
if (navController && ([[navController viewControllers] count] > 0))
{
[navController popToRootViewControllerAnimated:NO];
}
return YES;
}
Hope it may work for you.
How about overriding UITabbarController for a custom one and implement the following method:
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController;
Next loop trough all the 'viewcontrollers' of the tabbar (in this case the navigation controllers) and call on all the navigation controllers popToRootViewController.
This might work.
I want navigate to Rootview of 1st Tabbar item by clicking a button on fourth tabbar using this code just changes the Tabbar selection
code snippets
[self.parentViewController.tabBarController setSelectedIndex:0];
Previous action to be appear in the home view controller .
i need Direct navigation of Home view controller in main page
How to resolve in this issue?
Thanks in advance
First get your UINavigationController of the first tabbar item.
UINavigationController *navController = [self.tabBarController.viewControllers objectAtIndex:0];
And then navigate to root view controller.
navController popToRootViewControllerAnimated:NO];
That's all. :)
You have to pop the selected tab bar navigation stack to root.. You can achieve this by several method one is as below..
In your AppDelegate implement the tabbarcontroller delegate function, make sure you have set the tabbarcontroller delegate to AppDelegate..
-(void) tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
//Check the selected index to 0
if ([viewController isKindOfClass:[UINavigationController class]] && tabBarController.selectedIndex == 0) {
[(UINavigationController *)viewController popToRootViewControllerAnimated:NO];
}
}
I could use some help debugging this issue if anyone has had experience with it. I have a UITabBarController as my root view controller. The first view controllers of each tab are UINavigationController.
Tab 1:
A view with a map is the first viewController.
When you push on the callout, this code is run:
- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control {
[self performSegueWithIdentifier:#"ShowLocationDetails" sender:self];
}
In the storyboard, I have this wired up as Push.
On the first viewController, because I have a map and don't want to have a navigation bar show, I do this:
FirstViewController <UINavigationControllerDelegate>
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
[self.navigationController setNavigationBarHidden:YES animated:NO];
}
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
[self.navigationController setNavigationBarHidden:YES animated:NO];
}
On the second view controller that I push onto the stack, I do want the navigation bar, so I have this code:
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
if ([viewController isKindOfClass:[FirstViewController class]]) {
[self.navigationController setNavigationBarHidden:YES animated:YES];
}
else {
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
}
Tab 2:
Just a tablview for right now.
I can get my app to crash if I do these simple steps:
Press the callout to push the LocationDetails.
Press back to go back to First View Controller
Press tab two to go to a TableViewController
Press tab one to go back to the map and this crashes it with an EXC_BAD_ACCESS. I tried running Instruments, but I didn't know what it meant:
If I start the app, and just switch between the tabs all day without pushing a new controller onto the stack on tab 1, it does NOT crash.
It also does not crash if I remove the navigationController willShowViewController delegate methods. But of course then I have the navigation bar which is not what I want.
Any thoughts? Thanks!
EDITED
So I tried what Nuzhat said and I get the same problem. I tried both
self.navigationController.navigationBar.hidden = YES;
and
self.navigationController.navigationBardHidden = YES;
and it isn't the solution I"m looking for. What happens is when I push to the next view controller the navigationBar is not there. So in that viewController's viewDidLoad, I set
self.navigationController.navigationBar.hidden = NO;
Then I pop back to FirstViewController, then I switch tabs, still crashes. There seems to be a problem with hiding the navigation bar, and then showing it again.
When i press certain Tab it's not going to its rootviewcontroller,
When user changes a tab, for the selected tab I want to push it to its top level controller.
I have implement this method but not works,
-(void)tabBarController:(UITabBarController *) tabBarController didSelectViewController : (UIViewController *)viewController
{
[viewController.navigationController popToRootViewControllerAnimated:NO];
}
What's wrong with this?
How can i do that?
Assuming the method gets called (if not you should set the UITabBarController delegate), you are probably receiving the UINavigationController (which is a subclass of UIViewController) as viewController, you can check by logging it:
-(void)tabBarController:(UITabBarController *) tabBarController didSelectViewController : (UIViewController *)viewController
{
NSLog(#"didSelect %#", viewController);
[viewController.navigationController popToRootViewControllerAnimated:NO];
}
if that is the case, viewController.navigationController will probably be nil, you should be doing:
-(void)tabBarController:(UITabBarController *) tabBarController didSelectViewController : (UIViewController *)viewController
{
if ([viewController isKindOfClass:[UINavigationController class]])
[(UINavigationController*)viewController popToRootViewControllerAnimated:NO];
}
Can any one help me,
when i am using my UITabBarController delegate it is not working..
I called a delegate method like this..
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
[self.navigationController popToRootViewControllerAnimated:NO];
}
If what you're doing is subclassing a UITabBarController, then... oddly enough... you can get it working by setting itself as a delegate:
- (void)viewDidLoad
{
[super viewDidLoad];
self.delegate = self;
}
Then the didSelectViewController action will fire normally:
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {
NSLog(#"View Changed");
}
Don't forget to add your UITabBarControllerDelegate class to your .h file:
#interface MyTabBarController : UITabBarController <UITabBarControllerDelegate>
#end
If you are using tab bar customizing by extending UITabBarController and trying to change tab bar selected index programmatically then it will not call delegates.
Please see the note inside "UITabBarDelegate":
// Note: called when a new view is selected by the user (but not programmatically)
This might help you
-(void)applicationDidFinishLaunching:(UIApplication *)application {
tabBarController.delegate=self;
// Add the tab bar controller's current view as a subview of the window
[window addSubview:tabBarController.view];
}
specify
UITabbarcontrollerDelegate in .h file
then
-(void)applicationDidFinishLaunching:(UIApplication *)application {
tabBarController.delegate=self;
// Add the tab bar controller's current view as a subview of the window
[window addSubview:tabBarController.view];
}
Read the documents to get a deeper understanding of the relationships between navigation controllers, tabBar controllers, and the view and navigation hierarchy.
Then review the code you've provided. Which view/controller is the container? You are popping the navigationController of self, which is not the same as the tabBarController. I don't think you actually need this method if you are looking to switch between tabs.
Try commenting out this method. It is an optional method in the UITabBarController delegate protocol. If you comment it out, you should get the default behavior of the tab controller, which should be to select the appropriate viewController and switch to the new view.
You typically only need to use this method if you want some action taken as you switch between view controllers.