At the end of my apps game I want to reset so the game can be played again.
Ive tried the recommended method shown in the code but it causes:
Thread 1: signal SIGABRT error to occur.
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "ViewController")
var viewcontrollers = self.navigationController!.viewControllers
viewcontrollers.removeLast()
viewcontrollers.append(vc)
self.navigationController!.setViewControllers(viewcontrollers, animated: true)
Expect to be able to reset the game/app and proceed with a new game by pressing a button.
Can you try this?
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "ViewController")
let transition: UIView.AnimationOptions = .transitionFlipFromLeft
let rootviewcontroller: UIWindow = ((UIApplication.shared.delegate?.window)!)!
rootviewcontroller.rootViewController = vc
let mainwindow = (UIApplication.shared.delegate?.window!)!
UIView.transition(with: mainwindow, duration: 0.4, options: transition, animations: nil, completion: nil)
If your (re)starting ViewController class is the rootViewController of your UINavigationController then you can simply call:
navigationController?.popToRootViewController(animated: true)
Try to avoid the bang operator (!) to avoid similar force-unwrap crashes, for example you could safely unwrap the navigationController like so:
if let navController = navigationController {
navController.popToRootViewController(animated: true)
}
I have a view HostViewController in Host.storyboard and, in storyboard I am able to segue to AttendDetailViewController in Main.storyboard. However, I want to do this programmatically as follows:
private func attendDetailViewControllerSegue(event: CAEvent) {
let vc = AttendDetailViewController(nibName: "AttendDetailViewController", bundle: nil)
vc.event = event
navigationController?.pushViewController(vc, animated: true)
}
However, when I run this I get the following error:
'NSInternalInconsistencyException', reason: 'Could not load NIB in bundle: 'NSBundle ... with name 'AttendDetailViewController''
I have tried every solution on the internet for this problem, and I feel it might have something to do with the Views being in different storyboards.
Any thoughts on how to do this segue without an exception?
You have to get the storyboard from the bundle:
var hostStoryboard = UIStoryboard(name: "Host", bundle: Bundle.main)
Then, instantiate and present the view controller:
let someViewController = hostStoryboard?.instantiateViewController(withIdentifier: "AttendDetailViewController") as? AttendDetailViewController
self.navigationController?.present(attendDetailViewController!, animated: true)
Don't forget to set the AttendDetailViewController's storyboard identifier in the storyboard.
I also recommend you safely unwrap attendDetailViewController before using it:
let someViewController = hostStoryboard?.instantiateViewController(withIdentifier: "AttendDetailViewController") as? AttendDetailViewController
if let vc = attendDetailViewController {
self.navigationController?.present(vc, animated: true)
}
1- to load from xib ( used when there is AttendDetailViewController.xib file in your project )
let vc = AttendDetailViewController(nibName: "AttendDetailViewController", bundle: nil)
2- to load from storyboard ( used when the vc is inside a storyboard )
let vc = UIStoryboard(name: "Host", bundle: nil)!.instantiateViewController(withIdentifier: "vciD") as? AttendDetailViewController
3- load programmatically ( used when the vc layout is created programmatically )
let vc = AttendDetailViewController()
Am I using storyboards right?
I have several storyboards with view controllers in them.
When I need to navigate between them, I do the following:
I do create a new instance of the storyboard let storyboard = ... every time I use them. Is this a bad method? Or Should I declare it in the view did load?
func detailsRequestedForMessage(message: message) {
let storyboard = UIStoryboard(name: "Additional", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier: "MessageDetailsViewController") as! MessageDetailsViewController
viewController.messageId = message.id
self.navigationController?.pushViewController(viewController, animated: true)
}
func viewAllMessage() {
let storyboard = UIStoryboard(name: "Additional", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier: "AllMessageViewController") as! AllMessageViewController
self.navigationController?.pushViewController(viewController, animated: true)
}
func viewOptions() {
let storyboard = UIStoryboard(name: "Options", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier: "OptionsViewController") as! OptionsViewController
self.present(viewController, animated: true)
}
It costs nothing to store a storyboard reference, but takes time to resolve a storyboard reference from a name. So I would say that you should put lines like
self.storyboardAdditional = UIStoryboard(name: "Additional", bundle: nil)
in viewDidLoad, storing the references in properties, and thereafter refer to the storyboards by way of the properties.
I have a case in one of my Swift files which runs the following method:
case .editProfile:
vc = PoiDetailViewController()
self.navigationController?.popViewController(vc,animated: true)
It doesn't seem to work when I run the code.
The view controller is located on the main storyboard and I would like PoiDetailViewController to display when this case is called.
If I understand it correctly, you should be able to achieve what you're looking for by present in your code. Like so:
case .editProfile:
let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyBoard.instantiateViewController(withIdentifier: "PoiDetailViewController") // or whatever identifier you have given it
self.present(vc, animated: true, completion: nil)
That should work, however, make sure you set a storyboard ID for your view controller in the identity inspector.
No segues are required.
To set up a storyboard ID click on the View Controller you would like to use (in this case, PoiDetailViewController) and click the identity inspector icon and set a storyboard ID where it asks. I have attached an image so you can see where it needs to go (in the field marked 'Storyboard ID')
Hope that helps.
As per my Understanding you need to pop to specific View Controller if it is in stack and if not then you need to push to that controller
var loginVCFound:Bool = false;
let navigationController : UINavigationController! = self.window!.rootViewController as! UINavigationController;
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil);
let viewControllers: [UIViewController] = navigationController.viewControllers
for aViewController in viewControllers {
if aViewController is LoginVC {// Pass the name of your controller here
loginVCFound = true;
navigationController.popToViewController(aViewController, animated: true)
break;
}
}
if !loginVCFound { // change the identifier and VC with yours
let objLoginVC = mainStoryboard.instantiateViewController(withIdentifier: "LoginVC") as! LoginVC
navigationController.pushViewController(objLoginVC, animated: true)
}
I wonder if its possible to set a new root VC?
My app gets init with a uinavigation controller that has a table view to be the root VC.
Then from the table view I am running another segue to a login window (present modally) If you then login you end up in the red VC/account page. What I want to do now is to set the red VC to be the new root VC of the app, and remove all underlying VC's. So that I can show a menu button/icon instead of a "Back" button
I have found this but I dont understand how to use it:
let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
let yourViewController: ViewController = storyboard.instantiateViewControllerWithIdentifier("respectiveIdentifier") as! ViewController
let navigationController = self.window?.rootViewController as! UINavigationController
navigationController.setViewControllers([yourViewController], animated: true)
But I cannot get it to work. So is it possible to make the red vc in the picture act as the new root VC.
Swift 4.2
May be you should try this
let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
let redViewController = mainStoryBoard.instantiateViewController(withIdentifier: "respectiveIdentifier") as! ViewController
let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController = redViewController
Swift 4, 5, 5.1
let story = UIStoryboard(name: "Main", bundle:nil)
let vc = story.instantiateViewController(withIdentifier: "NewViewController") as! NewViewController
UIApplication.shared.windows.first?.rootViewController = vc
UIApplication.shared.windows.first?.makeKeyAndVisible()
Swift 3 Update:-
let testController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "testController") as! TestController
let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController = testController
Swift 4 Answer
let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let nextViewController = storyBoard.instantiateViewController(withIdentifier: "YourViewController") as! YourViewController
let navigationController = UINavigationController(rootViewController: nextViewController)
let appdelegate = UIApplication.shared.delegate as! AppDelegate
appdelegate.window!.rootViewController = navigationController
UINavigationController has a viewControllers property, which is a NSArray, And you can replaced it with your own NSArray of view controllrs.
This can be done as show in below sample code.
let newViewController = self.storyboard?.instantiateViewControllerWithIdentifier("YourViewControllerollerID") as! YourViewController
let customViewControllersArray : NSArray = [newViewController]
navigationController?.viewControllers = customViewControllersArray as! [UIViewController]
And if you want to show this new root view controller you can just call UINavigationController's popToRootViewController() method.
navigationController?.popToRootViewControllerAnimated(true)
In order to get the code snippet from the original question to work, I had to make a change to the third line
let navigationController = self.navigationController!
I am using this code in an #IBAction in the view controller that precedes the new root view controller.
Using the original code, I was receiving an error saying that my view controller had no member called window. After looking at the documentation, I could find no property named window. I'm wondering if the original block of code above was intended to be used inside a UINavigationController file.
Here is the block in its entirety.
let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
let todayViewController: TodaysFrequencyViewController = storyboard.instantiateViewControllerWithIdentifier("todaysFrequency") as! TodaysFrequencyViewController
let navigationController = self.navigationController!
navigationController.setViewControllers([todayViewControl ler], animated: true)
I wonder if its possible to set a new root VC?
Yes, it's possible. How you do it depends on the context...
My app gets init with a uinavigation controller that has a table view to be the root VC.
There are actually two things that are commonly called the "root view controller":
UIWindow has a rootViewController property, which is writeable.
UINavigationController has no rootViewController property, but it does have an initializer called -initWithRootViewController:. You can set the nav controller's "root" view controller by setting it's viewControllers property.
It sounds like you're trying to change the window's root view controller, but the code you show only changes the nav controller's viewControllers property. Try setting the window's rootViewController property directly. Understand, however, that if you take that approach then the navigation controller will go away too. If you want to keep the nav controller, on the other hand, go with your current approach.
But I cannot get it to work. So is it possible to make the red vc in the picture act as the new root VC.
More information here would be helpful. What do you mean by "cannot get it to work"? What happens, and what do you expect to happen?
For swift 4.0.
In your AppDelegate.swift file in didfinishedlaunchingWithOptions method, put the following code.
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
window = UIWindow(frame: UIScreen.main.bounds)
window?.makeKeyAndVisible()
let rootVC = MainViewController() // your custom viewController. You can instantiate using nib too. UIViewController(nib name, bundle)
let navController = UINavigationController(rootViewController: rootVC) // Integrate navigation controller programmatically if you want
window?.rootViewController = navController
return true
}
Hope it will work just fine.
For Swift 5 Users you can do this way and this will definitely work for you.
var window: UIWindow?
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
// Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
// If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
// This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
manageLoginSession()
guard let _ = (scene as? UIWindowScene) else { return }
}
func manageLoginSession() {
guard let window = window else {return}
if UserDefaults.standard.bool(forKey: "_key_AlreadyLogin") == true {
window.rootViewController = UIStoryboard(name: "Dashboard", bundle: nil).instantiateInitialViewController()
}else{
window.rootViewController = UIStoryboard(name: "Main", bundle: nil).instantiateInitialViewController()
}
}
You can use this code when you click the login button :-
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
var vc = mainStoryboard.instantiateViewControllerWithIdentifier("respectiveIdentifier") as ViewController
UIApplication.sharedApplication().keyWindow.rootViewController = vc
How and from where are you presenting redVC?
You could make it root view controller of your UINavigationController, so you would still have ability to push and pop view controllers.
self.navigationController?.viewControllers = [self];
You can use this bit of code:
let newViewController = self.storyboard?.instantiateViewController(withIdentifier: "HomeViewController") as! HomeViewController
let customViewControllersArray : NSArray = [newViewController]
self.navigationController?.viewControllers = customViewControllersArray as! [UIViewController]
self.navigationController?.pushViewController(newViewController, animated: true)
If you need to set rootViewController with some animations, here is the code:
guard let window = UIApplication.shared.keyWindow else {
return
}
guard let rootViewController = window.rootViewController else {
return
}
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "MainTabbar")
vc.view.frame = rootViewController.view.frame
vc.view.layoutIfNeeded()
UIView.transition(with: window, duration: 0.3, options: .transitionCrossDissolve, animations: {
window.rootViewController = vc
}, completion: { completed in
// maybe do something here
})
For Swift 5 and above this may work for you.
if let delegate = UIApplication.shared.connectedScenes.first?.delegate as? SceneDelegate {
delegate.window?.rootViewController = newViewController
delegate.window?.makeKeyAndVisible()
}
Swift 4,5
Use this below code for RootViewController
let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let mainViewController = storyBoard.instantiateViewController(withIdentifier: "MainViewController") as! MainViewController
let navigationController = UINavigationController(rootViewController: nextViewController)
if let window = UIApplication.shared.delegate?.window {
window?.rootViewController = navigationController
}
once you are in the vc that you want to set as root, just add in your viewDidLoad:
let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController = self
*As per best practice you should check if it is already the root, if not execute the code above.
Swift 3
AppDelegate file:::
#IBAction func btnGoBack(_ sender: UIButton){
self.goToHomeVC()
}
func goToHomeVC(){
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier :"HomeVC") as! HomeVC
let navController = UINavigationController.init(rootViewController: viewController)
if let window = self.appDelegate.window, let rootViewController = window.rootViewController {
var currentController = rootViewController
while let presentedController = currentController.presentedViewController {
currentController = presentedController
}
currentController.present(navController, animated: true, completion: nil)
}
}
You can try out this code
func switchRootViewController(rootViewController: UIViewController, animated: Bool, completion: (() -> Void)?) {
guard let window = UIApplication.shared.keyWindow else { return }
if animated {
UIView.transition(with: window, duration: 0.5, options: .transitionCrossDissolve, animations: {
let oldState: Bool = UIView.areAnimationsEnabled
UIView.setAnimationsEnabled(false)
window.rootViewController = rootViewController
UIView.setAnimationsEnabled(oldState)
}, completion: { (finished: Bool) -> () in
if (completion != nil) {
completion!()
}
})
} else {
window.rootViewController = rootViewController
}
}
Any view controller you want to set root just call the below function like
UIApplication.shared.setRootVC(vc)
extension UIApplication {
func setRootVC(_ vc : UIViewController){
self.windows.first?.rootViewController = vc
self.windows.first?.makeKeyAndVisible()
}
}
Just write this and you are good to go.
let sb = UIStoryboard(name: "Main", bundle: nil)
let VC = sb.instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController
let navRootView = UINavigationController(rootViewController: VC)
self.present(navRootView, animated: true, completion: nil)
This is how you can set the nib as root view controller.
let vc = HomeViewController(nibName: "HomeViewController", bundle: nil)
window = UIWindow(frame: UIScreen.main.bounds)
window?.rootViewController = vc
window?.makeKeyAndVisible()
Link to a related question
This answer applies to usage of an existing ViewController from somewhere in the current stack without instantiating and reconfiguring a new controller.
The documentation says: The root view controller provides the content view of the window. Assigning a view controller to this property (either programmatically or using Interface Builder) installs the view controller’s view as the content view of the window. The new content view is configured to track the window size, changing as the window size changes. If the window has an existing view hierarchy, the old views are removed before the new ones are installed.
Just as the documentation says: It removes all views in the stack if the rootViewController is exchanged. No matter what's with the controller. So remove the ViewController from the stack to assure its view won't be removed.
This resulted in my case in the following solution:
if let appDelegate = UIApplication.shared.delegate as? AppDelegate {
guard let pageVC = self.onboardingDelegate as? OnboardingPageViewController else { return } // my current stack is in a pageViewController, it also is my delegate
let vc = self // holding myself
pageVC.subViewControllers.removeLast() // removing myself from the list
pageVC.setViewControllers([pageVC.subViewControllers[0]], direction: .forward, animated: false, completion: nil) // remove the current presented VC
appDelegate.window?.rootViewController = vc
vc.onboardingDelegate = nil
appDelegate.window?.makeKeyAndVisible()
}
Swift 4
let storyBoard = UIStoryboard(name: "Your_Storyboard_Name", bundle:Bundle.main)
self.window = UIWindow(frame: UIScreen.main.bounds)
let yourVc = storyBoard.instantiateViewController(withIdentifier: "YourIdentifier") as? YourViewController
if let window = window {
window.rootViewController = yourVc
}
window?.makeKeyAndVisible()
Swift 4,5 and above
If you Use Multiple or single Story board you want to set Different Root view controller of Navigation Controler then I use This Method:
In My case StoryBaord Name is Auth.
func setRootToLogin(transition :CATransition) {
let storyboard = UIStoryboard(name: "Auth", bundle: nil)
let loginNav = storyboard.instantiateViewController(withIdentifier: "AuthNavigationController") as! UINavigationController
window.set(rootViewController: loginNav, withTransition: transition)
let vc = window.rootViewController as! UINavigationController
let loginvc = LoginViewController.instantiateAuth()
vc.setViewControllers([loginvc], animated: true)
}