I have a nib with four UIViewControllers each with a UITabBarItem. At runtime, based on user options, I need to show or hide one of the UITabBarItems. I cannot figure out how to remove the UITabBatItem.
Does anyone know how to do this?
Thanks
Christian's code is close. It should be:
NSMutableArray *viewControllers = [NSMutableArray arrayWithArray:myTabBarController.viewControllers];
[viewControllers removeObjectAtIndex:indexToRemove];
[myTabBarController setViewControllers:viewControllers];
To remove one, you can just get the viewControllers from the TabBar and put them in an NSMutableArray. Then remove the index you want removed and then set the viewControllers property to this new array of view controllers using
setViewControllers:animated:
Hoep this helps.
Get the tab bar controller's view controllers, remove the one you want to 'hide' and then set the tab bar controller's viewControllers array to this new array.
NSMutableArray *viewControllers = [myTabBarController viewControllers];
[viewControllers removeObjectAtIndex:indexToRemove];
[myTabBarController setViewControllers:viewControllers animated:YES];
Related
I found this code here that i think will do the job.
`/* suppose we have a UITabBar *myBar, and an int index idx */
NSMutableArray modifyMe = [[myBar items] mutableCopy];
[modifyMe removeObjectAtIndex:idx];
NSArray *newItems = [[NSArray alloc] initWithArray:modifyMe];
[myBar setItems:newItems animated:true];`
The question is, where should i write this code in order to work?
I tried putting it in viewDidLoad of the UITabBarController but it didn't work.
If you're modifying the tabbar items from the UITabbarController, you can't use setItems:animated:. From the docs:
In iOS 3.0 and later, you should not attempt to use the methods and properties of this class to modify the tab bar when it is associated with a tab bar controller object. Modifying the tab bar in this way results in the throwing of an exception. Instead, any modifications to the tab bar or its items must occur through the tab bar controller interface.
Instead, swap out the viewControllers property of your UITabbarController, removing the UIViewController that corresponds to the tabbar item you want removed. For example, if you want to remove the 2nd tabbar item:
NSMutableArray *newViewControllers = [NSMutableArray arrayWithArray:self.viewControllers];
[newViewControllers removeObjectAtIndex:1];
[self setViewControllers:newViewControllers];
I have a Tab bar Controller containing 5 Tabs and each tab bar item has individual navigation controller like :
Now , If i am currently in viewctrller3 of navigationctrller3 in Tab3 and i want to navigate to viewctrller2 of navigationctrller1 in Tab1 programmatically . Also I've selected the particular Tab1 programmatically But i m unable to reach viewctrller2 of
navigationctrller1. Is this feasible ?, If yes , then please elaborate..
Please guys join hands..!
If you are currently in viewctrller3, I think you should be able to do this:
UITabBarController *tabCont = (UITabBarController *)[self.navigationController parentViewController];
[tabCont setSelectedIndex:0];
UINavigationController *nav1 = tabCont.selectedViewController;
NSarray *newControllers = [NSArray arrayWithObjects:[nav1.viewControllers objectAtIndex:2],[nav1.viewControllers objectAtIndex:0],[nav1.viewControllers objectAtIndex:1], nil];
[nav1 setViewcontrollers:newControllers animated:NO];
That last line should rearrange the navigation controller's viewControllers so that viewctrller2 is now the top view controller.
One way to achieve this is
before setting the SelectedIndex of a tabbar , you maintain one reference variable in appDelegate and assign to it the name of the class which is required to be navigated after tab selection.
In the delegate of tabbar controller :
(void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController;
check whether the visible controller is kind of class same as the class name that is set in appdelegate reference variable? If yes then nothing to do , if not then check if that controller is in the navigation stack or not? If its there in stack then pop/push to that index controller else create that controller and push to it.
I dont think that there will be any issue in this. suppose your nav1 is 1st navigationController.
[self.nav1 pushViewController:view2 animated:YES];
its will have to work for you.
From ViewController3 execute..
UINavigationController *navigationController1 = [appDelegate.tabBarController.viewControllers objectAtIndex:2]; // fetch the navigationController
[navigationController1 popToViewController:[navigationController1.viewControllers objectAtIndex:1] animated:NO];
[appDelegate .tabBarController setSelectedIndex:0];
I have 5 view controllers(say A,B,C,D,E) in my navigation stack. ViewController E is in the top of the stack. On a button click in ViewController E, I want to move to ViewController C. For that I am using the following code.
NSMutableArray *navigationarray = [NSMutableArray arrayWithArray:self.navigationController.viewControllers];
[navigationarray removeObjectAtIndex:4];
[navigationarray removeObjectAtIndex:3];
self.navigationController.viewControllers = navigationarray;
[navigationarray release];
Is there a better way to do this, where I can check which viewController is being removed from the navigation array
Edit: In this case, could I check whether the viewcontroller being removed isKindOfClass of the class of the particular view controller like
if ([[navigationarray objectAtIndex:4] isKindOfClass:[MyClass class]])
Popping view controller from navigation controller is the easy way. This will remove VC E and D.
[self.navigationController popToViewController:viewControllerC animated:YES];
Is it possible to change/replace ViewContoller (and View) for one of the Tabs in a UITabBarController?
I would like to switch between 3 different ViewControllers in any order from a specific Tab (that´s why NavigationController is not possible).
They are set (in mass) using setViewControllers:animated: so you could do something like this.
// Assume tabController is the tab controller
// and newVC is the controller you want to be the new view controller at index 0
NSMutableArray *newControllers = [NSMutableArray arrayWithArray:tabController.viewControllers];
[newControllers replaceObjectAtIndex:0 withObject:newVC];
[tabController setViewControllers:newControllers animated:YES];
Hope that helps.
I would like for one tab in a UITabBarController to have a fixed position and the user can reorganize the other tabs however they like. I have the UITabBarController > UINavigationController > UITableViewController setup.
Is this possible?
UPDATE:
The following code, in applicationDidFinishLaunching, is what I'm using and it doesn't work. I'm trying to get a reference to the SavedTableViewController, I think that's the problem. Any ideas?
NSMutableArray *customizableVCs = [NSMutableArray arrayWithArray:tabBarController.customizableViewControllers];
for (id controller in tabBarController.customizableViewControllers){
if ([controller isKindOfClass:[SavedTableViewController class]]){
NSLog(#"Removing Object");
[customizableVCs removeObject:controller];
}
}
tabBarController.customizableViewControllers = customizableVCs;
UPDATE 2:
This is the code that worked for me. I had to put the snippet below adding the tabBarController to the window.
[window addSubview:tabBarController.view];
[self setTabOrderIfSaved];
NSMutableArray *customizableViewControllers = [NSMutableArray arrayWithArray:tabBarController.customizableViewControllers];
[customizableViewControllers removeObject:savedNavigationController];
tabBarController.customizableViewControllers = customizableViewControllers;
Remove the view controller corresponding to that tab from the customizableViewControllers property of your tab bar controller. Assuming that you want fixedViewController to remain fixed:
NSMutableArray *customizableViewControllers = [NSMutableArray arrayWithArray:tabBarController.customizableViewControllers];
[customizableViewControllers removeObject:fixedViewController];
tabBarController.customizableViewControllers = customizableViewControllers;
Because customizableViewControllers is reinitialized when the viewControllers property is changed, you should do this after the rest of your tab bar controller’s state has been set up.