When my app launches, I'll have an initial list that the user chooses from. Once chosen, the user should be taken to a UITabController that has content related to the item chosen on the initial list.
For the user to get back to that list, I'd like to have a Title/Tool bar at the top of the app. The bar should contain a title and a button that let's the user get back to that first modal list of items where a new item can be chosen.
I know I can have each individual view controller specify a title as well as a button, but I'd like it controlled at the AppDelegate rather than at each view so that each view doesn't have to contain duplicate logic to accomplish this.
Ideally my app would be a UINavigationController with a UIViewController that contains a UITabViewController; however, it seems that Apple frowns on this type of flow.
Is there a way to manage this?
I don't think there's any way to do this at the tab bar controller level. You could make a subclass of UIViewController to add some methods and properties to take care of your title bar, and then have each of your individual controllers inherit from that class instead of directly from UIViewController
Related
This is kinda long but I want to give as many details as possible.
I have created a status bar app. One of the things I've done is made it to where there is a "Settings" menu item that if you click on, an NSWindow pops up with 5 different buttons -- these buttons are tied to their own custom NSViewController so that if you click them, the View Controller changes, but the window remains the same, just like any other StatusBar app.
On one of the view controllers is a popup button with several user selectable options. If I add a button to the specific VC (view controller) and link that to an ibaction that pulls the selected index of the popup button, it works just fine (i.e. I select item 2, it logs item 2).
Now here's where things get. . . odd. I've created a submenu that would in theory allow the user to quickly change the selected item of the popup linked to my custom view controller. Think of this submenu as being labeled 1-4 and clicking one of those items would change the index of the popup button, however every time I try this and follow it up with a NSLog to ensure the button has changed, it ALWAYS reads zero, in other words, it NEVER changes.
Here's what I tried.
Just like with every other view controller I've ever used, I create a new object of my view controller (alloc, init), and reference the popup button object that i've created as a property. This compiles just fine, but returns only zero no matter what is selected.
I've tried calling the method that I know works (the button that is on the view controller containing the popup), but again, this returns only zero no matter what is selected.
Any advice would be greatly appreciated.
tl;dr: can't change a popupbutton on a view controller from the app delegate or nsstatusmenu item, it just always returns zero.
EDIT: I have found a work around since I can communicate to my app delegate just fine, I created an int property and set it to zero. From there, whenever my popupbutton on my VC changes, I change the value of the app delegate int property and just ensure that whenever the nib launches, it set's the selected item to the app delegate property. I feel there has to be a more straight forward way to just get the value of the popup and change it from the app delegate.
EDIT 2: Some code as requested. I realized I needed to point the the view controller by using initwithnibname from the app delegate and then load the view. Doing so allows me to pull the first object in the popup button, any subsequent changes are not recognized unless I do so via my test button on the view controller itself. Also, I'm adding values to my popup in my awakefromnib in the view controller.
searches_VC = [[Searches_ViewController alloc] initWithNibName:#"Searches_ViewController" bundle:nil];
[searches_VC loadView];
NSLog(#"Selected Title: %#",[[searches_VC profilePopupOutlet] titleOfSelectedItem]);
I have two weeks programing in objective-c. Basically, I have a three views handled by a tab bar. Each view has rounded rect buttons that calls another view with different information. Also, at the top of each view, there is a bar button item. The title of all those bar button items depends of the value of a switch: manual or automatic. If it is automatic, the button's title must be "Trigger". If it is manueal, the button's title must be "Star" and, if you make a click on it must change to "Stop". My problem is, the button's title is changing but if I'm in the fist view and I press "start", it change to "stop", but in the second view it's still "start".
So, could you help me with this, please?
Sorry, I don't understand your problem (it would be easier if you would provide code or pictures). Thus I try to interpret the title of your question:
You have a tab bar controller that controls a few view controllers that have each its own view. These views are independent of each other. If each view has e.g. its own barBottom item but they should all have the same title when you switch from one tab view to another, their titles must be changed by program. Since only the tab bar controller knows when it changes its views, it has to assign the new title to all the barBottom items of its views.
It can do this using its delegate that corresponds to the UITabBarControllerDelegate protocol. This delegate (and the tab bar controller may be its own delegate) can e.g. implement the method tabBarController:didSelectViewController: which is called when one switches from one view to another. In this method, the tab bar controller can set the new title by calling a method in each of its view controllers (which can be accessed via the property viewControllers).
I have a six UITabBarItem in a UITabBarController.
I want to disable the NavigationBar that auto-generates the tab number 5, which allows you to reorder the tabs as you want.
Is there a way to disable this function?
EXTRA
I use customtabbar but in the tab5 appears this navigationbar.
the tab6 for me must be "hidden"
there is the property customizableViewControllers
from the docs:
"Changing the value of the viewControllers property (either directly or using the setViewControllers:animated: method) also changes the value of this property. When first assigned to the tab bar controller, all view controllers are customizable by default."
so call myTabBarController.customizableViewControllers = nil to remove customization
It looks like you are using a UITabBarController.
You can only have up to 5 tab bar items without bringing up the additional item to customize the bar items. If you don't want the extra tab to allow for customization, your 6th item will be unreachable anyway, so just remove the last tab to make it 5 items.
From the UITabBarController Documentation:
The tab bar has limited space for displaying your custom items. If you
add six or more custom view controllers to a tab bar controller, the
tab bar controller displays only the first four items plus the
standard More item on the tab bar. Tapping the More item brings up a
standard interface for selecting the remaining items.
If you do not like this limitation, use a UITabBar directly. There is more work involved because you won't be using a UITabBarController which manages the view controllers of your tabs for you.
I have an scope bar containing a NSSearchField. The bar can be shown and hidden using a menu item. I generate this bar by creating a new NSViewController (and loading a new view from the XIB). When the bar is shown, I do a addSubview: to the window's contentView; when the bar is hidden, I do removeFromSuperview to the view within the view controller.
If when I launch the app and the bar is already opened, hitting tab toggles between the main view within the window (a table view) and the search field in the scope bar. If I launch the app and the bar isn't already shown, once I do show the bar I can tab from the table view to the search field, but not the other way.
Once I remove the scope bar for the first time, then show it again, I can no longer tab between the search field and the table view, no matter which view is currently selected.
Is there something I need to be doing besides addSubview: and removeFromSuperview? I can't wrap my head around why this won't work, and especially why I get different behaviors if the bar is shown on launch or not.
You need to set the nextKeyView of both views if you want to control what happens when you hit the tab key.
[yourTableView setNextKeyView:yourSearchField];
[yourSearchField setNextKeyView:yourTableView];
However, you need to be careful because you can break the automatically constructed key-view loop. This article has more detail on how to handle this situation.
I was able to get the desired behavior by setting setAutorecalculatesKeyViewLoop: to true on the views' window.
I currently have a Main Window set up as a UINavigationController (also is the root view controller), and I have two views. The first view is the login screen, and the second screen is a table view screen. What I would like to have happen is to show different UIBarButtonItems based on what screen is showing up. For instance, when the logon screen is being displayed, I want a left button on the navigation bar to be displayed (more specifically, it'd be a Settings button before logging in). Once the user logs in, I want the left button to say "Logout" and the right to be a reload button. I've tried programmatically adding the buttons, but they won't show up. Any suggestions?
Also, I've gotten most of this done in IB, but I feel like it would probably be easier to add these buttons programmatically.
All subclasses of UIViewController have a property called navigationItem. While it is readonly, you can alter its properties. So in LoginViewController, you would do self.navigationItem.leftBarButtonItem = /* Code to create the bar button */ and likewise within the TableViewController. Let me know if you need more detail.