Opening view controller from app delegate using swift

Question

I am trying to create a push notification which determines which view to open according to information obtained from the push.

I have managed to get the information from the push, but I am now struggling to get the view to open

Looking at other stack overflow questions I have the following currently:

App Delegate Did finish loading:

     //Extract the notification data
    if let notificationPayload = launchOptions?[UIApplicationLaunchOptionsRemoteNotificationKey] as? NSDictionary {
        // Get which page to open
        let viewload = notificationPayload["view"] as? NSString
        let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
        //Load correct view
        if viewload == "circles" {

            var viewController = self.window?.rootViewController?.storyboard?.instantiateViewControllerWithIdentifier("Circles") as! UIViewController
            self.window?.rootViewController = viewController

                        }
    }

Currently this is failing on the var ViewController = self... line.

I tried this and it works as far as opening "Circles" view controller. But let say "Circles" view controller is itself within a sub tree of navigation tree of my app. How do I make sure that once I open my app in "Circles" view controller, all the back navigations work? Right now, it opens "Circles" view controller without showing the back navigation. — Dogahe
– Dogahe, Commented Aug 29, 2016 at 16:02

Ky - · Accepted Answer · 2019-12-16 05:17:26Z

119

You have to set ViewController StoryBoardId property as below image.

enter image description here

open viewController using coding as below in swift

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

         let mainStoryboardIpad : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
         let initialViewControlleripad : UIViewController = mainStoryboardIpad.instantiateViewControllerWithIdentifier("Circles") as UIViewController
         self.window = UIWindow(frame: UIScreen.main.bounds)
         self.window?.rootViewController = initialViewControlleripad
         self.window?.makeKeyAndVisible()

         return true
    }

For iOS 13+ (based on an article by dev2qa)
Open SceneDelegate.swift and add following

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

    // If this scene's self.window is nil then set a new UIWindow object to it.
    self.window = self.window ?? UIWindow()

    // Set this scene's window's background color.
    self.window!.backgroundColor = UIColor.red

    // Create a ViewController object and set it as the scene's window's root view controller.
    self.window!.rootViewController = ViewController()

    // Make this scene's window be visible.
    self.window!.makeKeyAndVisible()

    guard scene is UIWindowScene else { return }
}

There is an open-source navigation utility which attempts to make this easier. Example

edited Dec 16, 2019 at 5:17

Ky -

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answered Jun 2, 2015 at 9:58

Kirit Modi

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5 Comments

rjcarr Over a year ago

But this is creating a new instance of the controller. I want the controller that already has state. Or am I missing something?

ArgaPK Over a year ago

app delegate method is not called when receive a User Notification , why?

Kirit Modi Over a year ago

Same for swift vertion but only syntax change.

Rashid KC Over a year ago

but viewDidLoad is not worked in that viewController ("circles")

MD TAREQ HASSAN Over a year ago

latest: put the answer code in

SceneDelegate.scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions)

(FYI, i created a navigation util based on this)

Quy Bui · Accepted Answer · 2017-02-25 09:50:33Z

56

Swift 3:

This is my preferred approach when presenting a new viewController from the current viewController through the AppDelegate. This way you don't have to completely tear down your view hierarchy when handling a push notification or universal link

if let controller = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "someController") as? SomeController {
    if let window = self.window, let rootViewController = window.rootViewController {
        var currentController = rootViewController
        while let presentedController = currentController.presentedViewController {
            currentController = presentedController
        }
        currentController.present(controller, animated: true, completion: nil)
    }
}

answered Feb 25, 2017 at 9:50

Quy Bui

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9 Comments

Imtee Over a year ago

This is the best approach, You can dismiss this view as well self.dismiss(animated: true, completion: nil)

Lohith Korupolu Over a year ago

@Imtee: dismiss the presented viewController you mean?

Imtee Over a year ago

@LohithKorupolu, if u want to move from present view controller.

Justin Over a year ago

This worked for me, well done! I put this in the applicationWillEnterForeground method of my appDelegate to force restart my app at the splash screen when being reopened (that way, I can properly refresh my data and UI by maintaining a simple 'all through one path' model lol :) Thanks!

Imtee Over a year ago

@KrutikaSonawala , Use self.dismiss(animated: true, completion: nil) hope that work

|

Arvin Sanmuga Rajah · Accepted Answer · 2017-03-22 04:21:56Z

14

Swift 3

To present the view together with the navigation controller:

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier :"InboxViewController") as! InboxViewController
let navController = UINavigationController.init(rootViewController: viewController)

   if let window = self.window, let rootViewController = window.rootViewController {
       var currentController = rootViewController
       while let presentedController = currentController.presentedViewController {
           currentController = presentedController
        }
           currentController.present(navController, animated: true, completion: nil)
   }

answered Mar 22, 2017 at 4:21

Arvin Sanmuga Rajah

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1 Comment

xhinoda Over a year ago

this works...but if you have a tabBar, the tabBar is not show.

Pushpendra Kumar · Accepted Answer · 2017-07-03 08:31:51Z

8

First Initialize the window

self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
let storyBoard = UIStoryboard(name: "Main", bundle: nil)

For setting rootViewController inside AppDelegate Class

let viewController = storyBoard.instantiateViewControllerWithIdentifier("Circles") as UIViewController
self.window?.rootViewController = viewController
self.window?.makeKeyAndVisible()

edited Jul 3, 2017 at 8:31

Pushpendra Kumar

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answered Jun 2, 2015 at 10:01

iDhaval

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Comments

Community · Accepted Answer · 2020-06-20 09:12:55Z

6

There is a swift 4 version

func application(_ application: UIApplication, 
didFinishLaunchingWithOptions launchOptions: 
[UIApplicationLaunchOptionsKey: Any]?) -> Bool {
let mainStoryboardIpad : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let initialViewControlleripad : UIViewController = mainStoryboardIpad.instantiateViewController(withIdentifier: "Circles") as UIViewController
            self.window = UIWindow(frame: UIScreen.main.bounds)
            self.window?.rootViewController = initialViewControlleripad
            self.window?.makeKeyAndVisible()

return true}

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Jul 9, 2018 at 12:18

sixsixsix

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Comments

Amul4608 · Accepted Answer · 2019-06-12 04:25:56Z

5

In Swift 3

        let mainStoryboard : UIStoryboard = UIStoryboard(name: StorybordName, bundle: nil)
        let initialViewControlleripad : UIViewController = mainStoryboard.instantiateViewController(withIdentifier: identifierName) as UIViewController
        if let navigationController = self.window?.rootViewController as? UINavigationController
        {
            navigationController.pushViewController(initialViewControlleripad, animated: animation)
        }
        else
        {
            print("Navigation Controller not Found")
        }

edited Jun 12, 2019 at 4:25

answered Jan 2, 2018 at 17:44

Amul4608

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Comments

Community · Accepted Answer · 2017-02-28 19:27:33Z

3

I'd say creating UIWindow each time you want to change rootViewController is bad idea. After couple changes of rootVC (using upper solution) you are gonna have many UIWindows in your app at one time.

In my opinion better solution is:

Get new rootVC: let rootVC = UIStoryboard(name: "StoryboardName", bundle: nil).instantiateViewControllerWithIdentifier("newRootVCIdentifier") as UIViewController
Set frame for new rootVC from UIScreen's bounds: rootVC.view.frame = UIScreen.mainScreen().bounds
Set new root controller for current window (here with animation): UIView.transitionWithView(self.window!, duration: 0.5, options: .TransitionCrossDissolve, animations: { self.window!.rootViewController = rootVC }, completion: nil)

Done!

You don't need method window?.makeKeyAndVisible(), cause this solution works on current app window.

edited Feb 28, 2017 at 19:27

CommunityBot

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answered Feb 5, 2016 at 14:44

Marcin Biliński

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1 Comment

Krutika Sonawala Over a year ago

how to dismiss this vc?

Anil · Accepted Answer · 2018-01-02 06:38:45Z

3

Swift 3 SWRevealViewController

    self.window = UIWindow(frame: UIScreen.main.bounds)
    let storyBoard = UIStoryboard(name: "Main", bundle: nil)

    let viewController = storyBoard.instantiateViewController(withIdentifier: "SWRevealViewController") as! SWRevealViewController
    self.window?.rootViewController = viewController
    self.window?.makeKeyAndVisible()

answered Jan 2, 2018 at 6:38

Anil

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1 Comment

ashif-ismail Over a year ago

navigationcontroller becomes nil if i open the app from extenstion using this code .. do you have any workaround ?

harsh shah · Accepted Answer · 2018-01-23 14:44:09Z

1

let storyboard = UIStoryboard(name: "Main", bundle: nil)

    let destinationViewController = storyboard.instantiateViewController(withIdentifier: "LandVC") as! LandingPageVC

    destinationViewController.webpageURL = NotificationAdvertisement._htmlpackagePath
    destinationViewController.adID = NotificationAdvertisement._adID
    destinationViewController.toneID = NotificationAdvertisement.toneID

    let navigationController = self.window?.rootViewController as! UIViewController

    navigationController.showDetailViewController(destinationViewController, sender: Any?.self)

answered Jan 23, 2018 at 14:44

harsh shah

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Comments

Sachin Rasane · Accepted Answer · 2018-09-28 06:40:20Z

0

SWIFT 4

let storyboard = UIStoryboard(name: "Main", bundle: nil)

    let destinationViewController = storyboard.instantiateViewController(withIdentifier: "LandVC") as! LandingPageVC

    destinationViewController.webpageURL = NotificationAdvertisement._htmlpackagePath
    destinationViewController.adID = NotificationAdvertisement._adID
    destinationViewController.toneID = NotificationAdvertisement.toneID

    let navigationController = self.window?.rootViewController as! UIViewController

    navigationController.showDetailViewController(destinationViewController, sender: Any?.self)

answered Sep 28, 2018 at 6:40

Sachin Rasane

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Comments

Rajesh Kumar Sahil · Accepted Answer · 2022-03-28 16:08:11Z

-1

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    guard let windowScene = (scene as? UIWindowScene) else { return }
    self.window = UIWindow(windowScene: windowScene)

    let mainStoryboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
    let vc : UIViewController = mainStoryboard.instantiateViewController(withIdentifier: "LoginViewController")
    let rootNC = UINavigationController(rootViewController: vc)
    self.window?.rootViewController = rootNC
    self.window?.makeKeyAndVisible()

}

answered Mar 28, 2022 at 16:08

Rajesh Kumar Sahil

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