Like the title states, how do you programmatically set the accessibilityIdentifier on a UITabBar's buttons? I'm currently trying to set the UITabBarItem's accessibilityIdentifier before adding it to the tab bar, but that doesn't seem to carry through to the button.
How do you go about setting an accessibilityIdentifier on the actual buttons that are displayed on the page?
When I ran into the same problem, I ended up setting the identifier on the underlying UITabBarButton (not sure if apple would object to that though..)
You need to setup your UITabbar with your UITabBarItem and their identifiers first, then:
//Set the tabbar items and their identifiers first, then, copy them on the underlying UITabBarButton using this code
int index = 0;
for (UIControl *control in controller.tabBar.subviews)
{
if ([control isKindOfClass:UIControl.class] && index < tabBarController.tabBar.items.count)
{
control.accessibilityIdentifier = controller.tabBar.items[index].accessibilityIdentifier;
index++;
}
}
I had this problem with SwiftUI. Putting the accessibilityIdentifier in a different place fixed it:
TabView(selection: $tabSelection) {
// ...
// ...
.tag(0)
.tabItem {
Label("Catalog", systemImage: "list.dash")
.accessibilityIdentifier("tabCatalog") // <-- Works here
}
.accessibilityIdentifier("tabCatalog") // <-- Doesn't work here
}
For UI tests, I'm doing it as follows, in a view controller:
self.tabBarItem.accessibilityIdentifier = #"NewRecordTab";
in Swift that would be
self.tabBarItem.accessibilityIdentifier = "NewRecordTab"
The tabBarItem property is not an inheritor of UIView. It is only used by the UITabBarController class when adding a child tab to it. After the tabBarController has loaded and initialized the tabs, it is useless to change the values of the tabBarItem property. Therefore, it is critically important where exactly you set the value of tabBarItem.accessibilityIdentifier.
The only working way is to set a value in the controller initializer as shown in the example below:
class ViewController: UIViewController {
init() {
super.init(nibName: nil, bundle: nil)
self.tabBarItem.accessibilityIdentifier = "myTabIdentifier"
}
}
If you set the value of this property elsewhere (for example, in the viewDidLoad method), then UITabBarController will never know about it, because the viewDidLoad method is called after tabBarController has initialized its tabs.
Alternatively, if the solution above does not suit you, you can interact with tabs using the tab index as follows:
let app = XCUIApplication()
app.tabBars.buttons.element(boundBy: tabIndex).tap()
Related
I have an app and from inside of it I am changing its language.
Language getting properly updated to other screens by changing UIView appearance.
Localize.setCurrentLanguage("ar")
UIView.appearance().semanticContentAttribute = .forceRightToLeft
I'm not able to get control back in my tabcontroller file. TabBar is custom created. I checked with awakefromNib() but it is not getting invocated every time. Is there any tab bar method where I can get control when it appears every time or is there any way to change language of tab bar item titles?
After changing app language in your VC create and call function localizeTabBar():
func localizeTabBar() {
tabBar.items![0].title = "1tab".localized
tabBar.items![1].title = "2tab".localized
tabBar.items![2].title = "3tab".localized
tabBar.items![3].title = "4tab".localized
}
For .localized use this String Extension
Or something like that:
func localizeTabBar() {
tabBar.items?.enumerated().forEach{ (index, item) in
item.title = "\(index)tab".localized
}
}
For .localized use this String Extension
I currently have three Swift files, one for the main view in a ViewController, and two more which are used for the two views within the first view, which are used for a Segmented Control.
As these don't use segues between each other, I can't use the prepareForSegue method to transfer data between them, so how do transfer the variables and such from one file to another?
This doesn't seem to be a duplicate as other cases such as the one commented are using segues, mine is not.
Are all three Swift classes view controller subclasses?
You have your main view controller with your segmented control. For each segmented, I would create a new view controller subclass.
On your main view controller, for each segment, use a 'Container View' instead of a UIView object.
This will create two new 'screens' in the storyboard, attached to your main view controller with a segue. These new screens will be UIViewControllers, you can change them to be your subclass's as normal.
You can now use your prepareForSegue function as normal to set data in your segmented control view controllers.
So you have something like viewControllerMain, which contains viewSegmentedOne and viewSegmentedTwo, and you want to be able to access `viewControllerMain.myProperty' ?
You can always navigate through the hierarchy to get parent views - but the easiest option could be to include a reference to viewControllerMain in each of the segmented controls
var myParentVC : ViewControllerMain?
then when you create the subviews
mySubView.myParentVC = self
If you are using storyboard for view controllers, then try like this:
let viewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "Your_VC_Identifier");
viewController.Your_var = Your_value_to_assign
NOTE: Define Your_var in your ViewController class
You just need to create an instance of the view controller you want to display, this is easy such as calling on the storyboard instance (usually the presenting view controller has one) instantiateViewController(withIdentifier:), by using an identifier that you provide in the storyboard file.
One created you can pass the data you want by casting it to your view controller class and present it as you prefer.
One method would be using singleton class . https://cocoacasts.com/what-is-a-singleton-and-how-to-create-one-in-swift/ this is how you can make singleton class.
other method could be using nsuserdefaults.
You need to decide which approach is best according to your requirement.
try this:
let defaults = UserDefaults.standard()
defaults.set(yourdata, forKey: "someObject")
print(defaults.object(forKey: "someObject"))
You can try use Extensions for UIViewController
private var storedDataKey: UInt8 = 0
extension UIViewController {
var storedViewControllerData: UIViewController? {
get {
return objc_getAssociatedObject(self, &storedDataKey) as? UIViewController
}
set(newValue) {
objc_setAssociatedObject(self, &storedDataKey, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_ASSIGN)
}
}
}
This very useful you can send data with chain like:
viewControllerB.storedViewControllerData = viewControllerA.storedViewControllerData
or
func viewDidLoad() {
doSomething(self.storedViewControllerData)
}
I have a progress bar (with its own controller). This bar is supposed to be shown in different views depending on which view is visible. As the progress will be same, If possible I don't want to create many progress bar in many views rather I want to use same instance in all these views. Also in that way when I need to change any property of the progress bar it will be reflected commonly, which is required.
Please suggest me how can I use this common view. And also if my strategy is wrong, what would be the better design for such scenarios.
1) Well you have 2 options. You can declare a new Class ViewBox (or whatever name) and then use that inside your code
First View Controller
var box:ViewBox = ViewBox()
When you segue or transition to your next screen, you can have a predefined variable var box:ViewBox!. Then say when you press a button, the button has a function called transition.
//Now setup the transition inside the Storyboard and name the identifier "toThirdViewController"
override func prepareForSegue(segue:UIStoryboardSegue, sender:AnyObject?) {
if(segue.identifier == "toThirdViewController") {
var vc = segue.destinationViewController as! `nextViewController` //The class of your next viewcontroller goes here
vc.box = self.box
}
//Since The SecondViewController doesn't need ViewBox, we don't need it there.
}
where
nextViewController:UIViewController {
var box:ViewBox!
}
Or you could do a much simpler way and that is to look up a UIPageViewController :)
In the settings section of my app the user has the option to change the language of the app. So when the user chooses spanish as his primary language the app show the content in spanish after he did an app restart but I want to change the language on the fly. This works for the main content like a TableView because I simply can reload the data but the language in my TabBarController does not change because I don't know how.
So I want to update (or better call it a reset) the TabBarController. After the reset it should display all navigation points in the new language.
My idea was to remove the current TabBarController and initialize a new one. Is this possible? Or is there a better way?
I am not an native english speaker so if my explanations aren't clear enough, just tell me and I'll try to rephrase them.
It might look scary and complicated because of my long post, But it really isn't, it is just long because I thought it would be better to also explain how to do it, instead of just giving a few lines of code.
You can achieve what you want using UITabBarController properties.
UITabBarController have a property called tabBar, which is the actual UITabBar.
One might think that in order to achieve what you want, you should edit this property,
HOWEVER, editing this property would cause an exception.
From apple's UITabBarController documentations, regarding the tabBar property:
You should never attempt to manipulate the UITabBar object itself stored in
this property. If you attempt to do so, the tab bar view throws an exception.
So you should never attempt to edit this property at runtime.
After that word of warning, here is what you should do-
UITabBarController also have a property called viewControllers, which is an NSArray who holds reference to the view controllers that being displayed by the tab bar.
This property CAN be modified at runtime, and changes applied to it are updated instantly in the tab bar.
However, for your case, you don't need to modify this property,
But I thought you should know that so if in some situation you will need to add or remove some items from your tab bar, you'll know that can do it.
What you do want to do, is iterate through the objects of that array to access the view controllers themselves.
UIViewController have a property called tabBarItem which represents the UITabBarItem of the view controller.
So what we are basically doing, is getting the tab bar item of the view controller, but instead of getting it from the UITabBarController itself, we are getting it directly from each view controller.
Each UITabBarItem has a title property, and this is what you want to change.
So now, after that long introduction, let's get to the actual code.
I think a pretty easy way to achieve what you want is to iterate thru the viewControllers array, and have some switch statement in there that would change the title.
As in any programming situations, this can be done in countless other ways, so you might have a better way to implement it than my example below, but this should do the trick.
Each view controller that being displayed in a tab bar controller, have a reference to that tab bar using the property tabBarController
So you can run this code in any of the view controllers that being displayed in the tab bar, and simply use self.reference to get a reference to it.
Add this somewhere after the language have changed-
for (int i = 0; i < [self.tabBarController.viewControllers count]; i++) {
if([self.tabBarController.viewControllers[i] isKindOfClass: [UIViewController class]]) {
UIViewController *vc = self.tabBarController.viewControllers[i];
switch(i) {
case 0:
vc.tabBarItem.title = #"primero";
break;
case 1:
vc.tabBarItem.title = #"secondo";
break;
}
}
}
What we are basically doing, is running a for loop that iterating thru all of the items in the array,
The items in the array are in the same order that they appear on the tab bar,
then we use a switch statement to change the title for the view controller in the corresponding position,
Since array have index 0, the first view controller is at position i=0 and the last one is at one less than the count of items in the array.
Some might argue that my if is unnecessary,
Since we already know that this array holds only view controllers, there is no need to check if the item at that position is of UIViewController class, or a subclass of it.
They might be right, but I always say it's better to be safe than sorry.
Of Curse I would also include in your code something to actually check to what language the user have chosen.
The example above changes the titles to spanish, regardless of the user's choice.
Hope it helps mate,
Good luck
#AMI289 gave a good idea.
Make an extension for UITabBarController and do a loop there. Can call anywhere from the tabBarControllers stack.
In my case after the tabBarController goes navigationController.
// MARK: - UITabBarController
extension UITabBarController {
func changeTitleLocale() {
guard let viewContollers = self.viewControllers else { return }
for (index, navVC) in viewContollers.enumerated() {
if let view = navVC as? UINavigationController {
if let topView = view.topViewController {
if topView.isKind(of: ProfileVC.self) {
self.tabBar.items?[index].title = "tab_profile"
} else if topView.isKind(of: ChatVC.self) {
self.tabBar.items?[index].title = "tab_chat"
} else if topView.isKind(of: PicturesVC.self) {
self.tabBar.items?[index].title = "tab_pictures"
} else if topView.isKind(of: VideosVC.self) {
self.tabBar.items?[index].title = "tab_videos"
}
}
}
}
}
}
Then, when we change a language just run it:
self.tabBarController?.changeTitleLocale()
I have 1 tab bar controller in storyboard and 1 UIViewController associated with it. I would like to re-use the same UIViewController in order to create second item in tab bar. When I am creating second relation from tab bar to view controller I need to specify 2 different items names. How can I re-use same view controller and set different items names from storyboard? If not possible to do it in storyboard, then do I have to rename each in tab bar controller class or there is better way?
I was going to provide different data to view controller in prepareforsegue.
UPDATE:
little more details and clarification
In above screenshot marked VC at the moment is reachable a) directly from tab, b) through 3 transitions. I want to add another DIRECT relation to initial tab bar, just like in case of "a".
I can give you a little tweak for that and at least that worked for me.
Drag a tabbarcontroller and associated tab item view controllers to
your storyboard. Name them as you like.
Create an extra view controller that you want to reuse from your storyboard.
Add container views to each tab item view controllers and remove their default embedded view controllers.
Create embed segue from each tab item controller to your re-usuable view controller.
The configuration looks something like the following:
Thus you can use the same embedded VC for different tabbar item. Obviously if you need the reference of the tabbarcontroller, you need to use self.parentViewController.tabBarController instead of self.tabBarController directly. But it solves the issue of reusing a VC right from the storyboard.
I've found much simpler solution using storyboard only.
Setup your storyboard like this:
Then in your Navigation Controller Identity Inspector set Restoration ID like this:
And in your ViewController class file put the following code:
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.navigationItem.title = parent?.restorationIdentifier
label.text = parent?.restorationIdentifier
}
or do what you like based on parent?.restorationIdentifier value
If you don't want the Navigation TopBar to appear on the ViewController just set it to None in Attributes Inspector of the desired Navigation Controller like this:
That's it! Hope it helps.
Yes you can.
All you need to do is to create a new View Controller in StoryBoard as if there is going to be a different View Controller for tab 2. Then Select the 2nd view controller and simply add its class name the same classname of view controller 1
Things to note:
When you are sharing the same view controller class (.m ad .h) files, each tab will create a NEW instance of that class.
Edit:
This works as long as you have either a "custom" cell scenario (i.e. reusing two table view controllers) OR, have all your views inside a "container view" (i.e. reusing UIView).
I needed slightly different solution than the accepted answer. I needed to use same Table View Controller with the different data source for different tab bar items. So in the storyboard, i created two Navigation Controllers with same classes like this;
I also give different "Restoration ID" to each of them.
For the first one, I gave "navCont1" and "navCont2" for the second one.
In subclass("GeneralNavCont") of these Navigation Controllers; I override init method and check restoration id of self. Then i initiate my TableViewController and set its data source based on ids like this;
class GeneralNavCont: UINavigationController {
var dataSource1 = [Countries]()
var dataSource2 = [Cities]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
initiateTableVCBasedOnId()
}
func initiateTableVCBasedOnId() {
let storyBoard = UIStoryboard(name: "Main", bundle: nil)
let tableVC = storyBoard.instantiateViewController(withIdentifier: "tableVC") as! MyTableViewController
if self.restorationIdentifier == "navCont1" {
tableVC.dataSource = self.dataSource1
self.viewControllers = [tableVC]
}
else if self.restorationIdentifier == "navCont2" {
tableVC.dataSource = self.dataSource2
self.viewControllers = [tableVC]
}
}
}
Hope it helps someone. Cheers.