I am using Xcode 11.2.1, Swift 5, and have a view that is presented Modally. Via storyboard I added a navigation bar and have two navigation items, left, cancel, right, save. I am trying to get the title of the view to display. I have tried via viewDidLoad
override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.title = "New " + costumeChoice
imageFromFileButton.alpha = 0.5
imageFromFileButton.isEnabled = false
costumeImageView.image = UIImage(named: "PauPlaceholder")
}
I have tried "self.navigationItem.title = "New " + costumeChoice" through viewWillAppear and through viewDidAppear, but no luck.
What am I missing?,
You have to present the NavigationController which embedded your ViewController, that way a navigationBar will be presented.
For example:
Assuming that your current ViewController is CurrentViewController
and viewController which you want to present is DestinationViewController
In order to present the destinationController you have to do this: -
// self ==> CurrentViewController
self.present(UINavigationController(rootViewController:DestinationViewController(), animated: true)
Related
My app has a TabBarController. Each tabBarItem relates to a ViewController embedded in a NavigationController.
When in first tabBarItem and selecting another tabBarItem I want to do some stuff before moving to the selected ViewController. Therefore I created a class for my tabBarController and made it UITabBarControllerDelegate.
What I want to do is present an alert with two buttons; button A cancels the move to the selected viewController and button B lets the move happen.
My problem is that when button B is pressed, I want to popToRootViewController. I gave the navigationController a storyboardID and tried to instantiate it like shown below.
func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
if let alert = self.storyboard?.instantiateViewController(withIdentifier: "ActiveSessionWarningAlert") as? ActiveSessionWarningAlert {
alert.modalPresentationStyle = UIModalPresentationStyle.overCurrentContext
alert.modalTransitionStyle = UIModalTransitionStyle.flipHorizontal
let alertWasDismissed: (Bool) -> Void = { userWantsToMoveToSelectedViewController in
if userWantsToMoveToSelectedViewController {
if let navContr = self.storyboard?.instantiateViewController(withIdentifier: "firstNavContr") as? UINavigationController {
navContr.popToRootViewController(animated: true)
}
tabBarController.selectedViewController = viewController
}
}
alert.alertWasDismissed = alertWasDismissed
self.present(alert, animated: true, completion: nil)
}
return false
}
Everything works as expected, but the popToRootViewController doesn't seem to occur; when selecting the first tabBarItem again the same viewController that was 'active' when we left the item is still showing.
I checked so that the viewController I want to pop is actually in the navigation stack and that the navContr != nil.
What am I missing?
You don't say so, but I'm assuming that the alertWasDismissed closure you pass to your alert view controller gets invoked when the user dismisses the alert.
The problem with your closure is this bit:
if let navContr = self.storyboard?.instantiateViewController(withIdentifier: "firstNavContr") as? UINavigationController
Any time you call instantiateViewController(withIdentifier:), you are creating a brand new, never before seen instance of a view controller (a navigation controller in this case.) That navigation controller has nothing to do with the one that belongs to the current tab that you are trying to dismiss. It doesn't have anything in it's navigation stack other than the root view controller that is defined in the storyboard.
What you need to do is find the navigation controller of the current tab in your tab bar controller's tabBarController(_:shouldSelect:) method, and pass that navigation controller to your alertWasDismissed closure.
At the time the tabBarController(_:shouldSelect:) method is called, the tab bar controller's selectedViewController should contain the current view controller. Replace the line above with:
if let navContr = tabBarController.selectedViewController? as? UINavigationController {}
That should work.
In my project you can create a post from a modal view.
When the modal view is dismissed (user presses on save post) I want to switch the tab bar controller to the second tab (post feed screen).
This topic is similar to my problem. The only difference being this is presented from a modal view. I can't figure out how to implement it in my code (tab bar is nil)
Switch tab bar programmatically in Swift
I have added 3 images to make this issue clearer
code screenshot
console message
#objc func saveAction(sender: UIButton) {
print ("> save pressed")
print(presentingViewController?.tabBarController)
print(presentingViewController)
presentingViewController?.tabBarController?.selectedIndex = 1
dismiss(animated: true)
}
edit: sorry stack overflow doesn't allow me to add images yet
You can do this using delegate pattern. But if you prefer not to add a delegate for this, you can do as shown below;
You can switch the tabbar by changing the selectedIndex property of tabBarController
if let presenter = presentingViewController as? LibraryViewController {
presenter.tabBarController?.selectedIndex = 1
}
dismiss(animated: true)
If you are presenting the modal on navigation controller in tabbar, use:
if let tabBar = presentingViewController as? UITabBarController {
tabBar.selectedIndex = 1
}
dismiss(animated: true)
I added 2 ViewControllers into a TabBar, but now, the TabBar's NavigationBar 'took over' each view's NavigationBar.
I can't set a title for each one of them, I can't add buttons, nothing.
I tried a few solutions to solve it that I found on the internet, but nothing worked.
I need control over the NavigationBar of each one of the views, as I need them to be different, with different title, etc.
This is my TabBar code:
class TabBar: UITabBarController {
let homeVC = HomeVC()
let followingVC = FollowingVC()
override func viewDidLoad() {
super.viewDidLoad()
navigationController?.navigationBar.titleTextAttributes = [.foregroundColor: UIColor.appColors.mainWhite]
navigationController?.navigationBar.tintColor = UIColor.appColors.mainWhite
navigationItem.setHidesBackButton(true, animated: false)
homeVC.tabBarItem = UITabBarItem(tabBarSystemItem: .topRated, tag: 0)
followingVC.tabBarItem = UITabBarItem(tabBarSystemItem: .contacts, tag: 1)
let tabBarList = [homeVC, followingVC]
viewControllers = tabBarList
}
}
I really need the option to configure each NavigationBar from it's own ViewController, or atleast from the TabBar class.
You should add UINavigationController to each of your ViewControllers not your UITabBarController
First remove the UINavigationController of your TabBar, Either you have done this pragmatically or in the storyboard remove that first.
Second add UINavigationController to you ViewControllers
class TabBar: UITabBarController {
let homeVC = HomeVC()
let followingVC = FollowingVC()
override func viewDidLoad() {
super.viewDidLoad()
homeVC.tabBarItem = UITabBarItem(tabBarSystemItem: .topRated, tag: 0)
followingVC.tabBarItem = UITabBarItem(tabBarSystemItem: .contacts, tag: 1)
let homeNavigationController = UINavigationController(rootViewController: homeVC)
let followingNavigationController = UINavigationController(rootViewController: followingVC)
let tabBarList = [homeNavigationController, followingNavigationController]
viewControllers = tabBarList
}
}
Now if you change any properties like title and barButtons it will reflect accordingly.
Figured it out, the solution is:
The NavigationBar was not the TabBar navigation bar, but the screen that lead to the TabBar (Login Screen for example), I fixed it by hidding the navigation bar of the login screen when transfering to the TabBar controller, now the navigation bar of each view controller is shown and not blocked by the Login Viewcontrolelr navigationbar.
I'm trying to achieve what I think would be a simple task, but despite similar posts on here being answered, the solution eludes me....
I'm using Main.storyboard in Xcode 8/swift 3 to create an application with the initial ViewController being a UINavigationController. I then want to push to UITabBarController which has two view controllers which it holds a relationship with:
override func viewDidLoad() {
super.viewDidLoad()
let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
if let vc = mainStoryboard.instantiateViewController(withIdentifier: "test") as? UITabBarController {
self.navigationController?.pushViewController(vc, animated: true)
}
}
When launching the app, the initial ViewController successfully 'pushes' to the TabBarController/it's ViewControllers (image below). The issue I'm having is after adding navigation items/buttons in the TabBarController ViewControllers (either in Storyboard or programmatically) the buttons / nav items never show.
Storyboard setup
Simulator screenshot
I have seen a few posts such as the below links and have followed the suggested steps verbatim, but nothing has solved the problem. Any help would be greatly appreciated!
Adding buttons to navigation controllers
How to add buttons to navigation controller visible after segueing?
It's does not show, because your TabBarController also have his own UINavigationBar. ViewControllers are inside TabBarController
you can create custom TabBarController and handle tabs actions
Try this code:
class TabBarController: UITabBarController {
override var selectedViewController: UIViewController? {
didSet {
switch self.selectedViewController {
case self.selectedViewController is FirstViewController:
self.navigationItem.rightBarButtonItem = self.firstButton
case self.selectedViewController is SecondViewControlller:
self.navigationItem.rightBarButtonItem = self.secondButton
default:
break
}
}
}
}
I am trying to create a uitableviewcontroller as a modal viewcontroller to edit some settings. I am creating the tableviewcontroller in code and the thing i am struggling with currently is how to correctly add a navigation bar to the controller which will have a "Done" button on it that:
a) doesnt appear on top of the tableview and
b) does not scroll with the tableview??
This happens when i add the navbar to the contoller with:
[self.view addSubview:navigationBar];
This adds a navbar to the controller which goes on top and obscures the tables first row and also scrolls with the view?
I also thought about simply using a uiviewcontroller with a separate tableview however i like the funcitonality of automatically scrolling the tableview when editing a textfield that the tableviewcontroller gives you. Just cant figure how to setup this navbar??
thx
Just create UINavigationcontroller as the modal viewcontroller, and add the tableview as its root view controller.
Use Navigation controller as modalviewController(as suggested in the other answer). Here is the code:
UINavigationController *Controller = [[UINavigationController alloc] init];
//LoginViewController is a sub class of UITableviewController
LoginViewController *controller = [[LoginViewController alloc] init];
Controller.viewControllers=[NSArray arrayWithObject:controller];
[self presentModalViewController:Controller animated:YES];
[controller release];
[Controller release];
In Swift:
AppDelegate.swift
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject : AnyObject]?) -> Bool {
/*
#1. Instantiate a navigation controller and add the table view controller
as a child view controller.
*/
let navigationController = UINavigationController()
// Instantiate your desired ViewController
let storyboard = UIStoryboard(name: UIStoryboardName.Main.rawValue, bundle: nil)
let tableViewController = storyboard.instantiateViewControllerWithIdentifier("TableViewControllerID")
navigationController.addChildViewController(tableViewController)
/*
#2. Then we set the title of the navigation bar and add two bar button items.
*/
// We set the title of the navigation bar.
tableViewController.navigationItem.title = "My Title"
// Create left and right button for navigation item.
let leftButton = UIBarButtonItem(title: "Save", style: UIBarButtonItemStyle.Plain, target: tableViewController, action: "saveButtonClicked:")
let rightButton = UIBarButtonItem(title: "Right", style: UIBarButtonItemStyle.Plain, target: nil, action: nil)
// Create two buttons for the navigation item.
tableViewController.navigationItem.leftBarButtonItem = leftButton
tableViewController.navigationItem.rightBarButtonItem = rightButton
/*
#3. To finish we set the root view controller with the navigation controller.
*/
self.window?.rootViewController = navigationController
self.window?.makeKeyAndVisible()
return true
}
TableViewController.swift
// Method called when the user clicks on the Save bar button item.
func saveButtonClicked(sender: UIBarButtonItem) {
// Do something.
print("Save bar button item has been clicked!!!")
}