CODEWITHSUNDEEP
iosswiftappdelegate
rengineer
rengineer

Reputation: 359

Close and Then Open iOS Application to Specific ViewController

I've been looking on SO for the answer to this question but none seemed to work. My question is : when I close and then re-open an application in Swift, how do I make it so that it goes to a specific ViewController(i.e, to a PIN login page)? I know it has to do with App Delegate but all other suggestions ends in a crash. Below is my App Delete:

class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    FirebaseApp.configure()

    return true
}

func applicationWillResignActive(_ application: UIApplication) {
}

func applicationDidEnterBackground(_ application: UIApplication) {

    let mainStoryboard: UIStoryboard = UIStoryboard(name:"Main",bundle:Bundle.main)
    let secondViewController: PINViewController = mainStoryboard.instantiateViewController(withIdentifier: "PINViewController") as! PINViewController
    window?.inputViewController?.present(secondViewController, animated: true, completion: nil)
}

func applicationWillEnterForeground(_ application: UIApplication) {
}

func applicationDidBecomeActive(_ application: UIApplication) {
}

Upvotes: 1

Views: 262

Answers (5)

Tm Goyani
Tm Goyani

Reputation: 404

func presentToVC(yourVC:UIViewController){
        let navEditorViewController: UINavigationController = UINavigationController(rootViewController: yourVC)
        navEditorViewController.isNavigationBarHidden = true
        navEditorViewController.interactivePopGestureRecognizer?.delegate = self
        (self.window?.rootViewController as! UINavigationController).visibleViewController?.present(navEditorViewController, animated: true, completion: nil)
    }

Upvotes: 1

Deep Arora
Deep Arora

Reputation: 2040

Assuming that you are moving the app from background to foreground state, you can try this:

  func applicationWillEnterForeground(_ application: UIApplication) {

       // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
       let mainStoryboard: UIStoryboard = UIStoryboard(name:"Main",bundle:Bundle.main)
       let pinViewConroller: PINViewController = mainStoryboard.instantiateViewController(withIdentifier: "PINViewController") as! PINViewController
       self.window?.rootViewController.present(pinViewConroller, animated: false, completion: nil)

    }

Upvotes: 1

Bhavin Kansagara
Bhavin Kansagara

Reputation: 2916

You should put the presentation related code in applicationWillEnterForeground method, this will be invoked when next time user clicks on the appIcon and launch the app.

Here is the code to make it working.

func applicationWillEnterForeground(_ application: UIApplication) {

        let mainStoryboard: UIStoryboard = UIStoryboard(name:"Main",bundle:Bundle.main)
    let secondViewController: PINViewController = mainStoryboard.instantiateViewController(withIdentifier: "PINViewController") as! PINViewController
    window?.rootViewController?.present(secondViewController, animated: true, completion: nil)
}

Hope it helps.

Upvotes: 1

kirti Chavda
kirti Chavda

Reputation: 3015

here created extension to find out current visiblecontroller

extension UIViewController {
    func topMostViewController() -> UIViewController {
        if self.presentedViewController == nil {
            return self
        }
        if let navigation = self.presentedViewController as? UINavigationController {
            return navigation.visibleViewController.topMostViewController()
        }
        if let tab = self.presentedViewController as? UITabBarController {
            if let selectedTab = tab.selectedViewController {
                return selectedTab.topMostViewController()
            }
            return tab.topMostViewController()
        }
        return self.presentedViewController!.topMostViewController()
    }
}

extension UIApplication {
    func topMostViewController() -> UIViewController? {
        return self.keyWindow?.rootViewController?.topMostViewController()
    }
}

after that you can use it whenever you want

let topMostViewController = UIApplication.shared.topMostViewController()

 let secondViewController: PINViewController = mainStoryboard.instantiateViewController(withIdentifier: "PINViewController") as! PINViewController
    topMostViewController.present(secondViewController, animated: true, completion: nil)

Upvotes: 1

shivi_shub
shivi_shub

Reputation: 1058

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    self.window = UIWindow(frame: UIScreen.main.bounds)

    let mainStoryboard: UIStoryboard = UIStoryboard(name:"Main",bundle:Bundle.main)

    let initialViewController = mainStoryboard.instantiateViewController(withIdentifier: "PINViewController") as! PINViewController

    self.window?.rootViewController = initialViewController
    self.window?.makeKeyAndVisible()

    return true
}

Upvotes: 1

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