Swift 3 present view from appdelget when application was off

Question

when the user opening the push notification i present view from appdelget by this code

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

    application.applicationIconBadgeNumber = 0; // Clear badge when app is launched
    if UserDefaults.standard.bool(forKey: "PushOFF") == false
    {
        registerForRemoteNotification()
    }
    else
    {
        UIApplication.shared.unregisterForRemoteNotifications()
    }
    return true
}
func registerForRemoteNotification()
{
    if #available(iOS 10.0, *)
    {
        let center  = UNUserNotificationCenter.current()
        center.delegate = self
        center.requestAuthorization(options: [.sound, .alert, .badge]) { (granted, error) in
            if error == nil{
                UIApplication.shared.registerForRemoteNotifications()
            }
        }
    }
    else
    {
        UIApplication.shared.registerUserNotificationSettings(UIUserNotificationSettings(types: [.sound, .alert, .badge], categories: nil))
        UIApplication.shared.registerForRemoteNotifications()
    }
}

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    var token = ""
    for i in 0..<deviceToken.count {
        token = token + String(format: "%02.2hhx", arguments: [deviceToken[i]])
    }
    print("DEVICE TOKEN = \(token)")
}

func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error)
{
    print("Registration failed! error=\(error)")
}
//Called when a notification is delivered to a foreground app.
@available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)
{
    print("foreground User Info = ",notification.request.content.userInfo)
    completionHandler([.alert, .badge, .sound])
    print("foreground app",notification.request.content.userInfo)
}

//Called to let your app know which action was selected by the user for a given notification.
@available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void)
{

    completionHandler()
    let result = response.notification.request.content.userInfo as! Dictionary<String, AnyObject>
    print("action User Info = ",result)

    let app = result["aps"] as! Dictionary<String, AnyObject>
    let title = app["alert"] as! String
    let id = result["id"]?.integerValue
    print("alert=",title,"id=",id!)
    if id != 0
    {
        if UserDefaults.standard.bool(forKey: "login")
        {
            UserDefaults.standard.set(title, forKey: "notificationTitle")
            UserDefaults.standard.set(id, forKey: "notificationId")
            UserDefaults.standard.synchronize()
            if let controller = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "PostVC") as? UINavigationController
            {
                    var currentController = window?.rootViewController
                    while let presentedController = currentController?.presentedViewController
                    {
                        currentController = presentedController
                    }
                    currentController?.present(controller, animated: true, completion: nil)
            }
        }
    }
}

if the application is working the code run perfect but when the application is off it present "PostVC" view first and present the root-view on top of "PostVC" view!! so you can't see the "PostVC" view.

what is wrong ? but i wouldn't to use window?.makeKeyAndVisible()

Answer 1

Ok! I give you an idea. Whenever the notification is fired and the user taps the notification, UNNotificationDefaultActionIdentifier will be called. Try this:

 func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

    switch response.actionIdentifier {

    case UNNotificationDefaultActionIdentifier:

        DispatchQueue.main.async(execute: {
            openViewController()
        })

    default:
        break
    }

    completionHandler()
}

This is going to be your function:

func openViewController() {
    let controller = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "PostVC") as? UINavigationController
    self.window?.rootViewController = controller
    self.window = UIWindow.init(frame: UIScreen.main.bounds)
    self.window?.makeKeyAndVisible()
}

But as I suggested above open a childViewController instead.

 func openViewController() {

    let storyboard = UIStoryboard.init(name: "Main", bundle: nil)
    let rootViewController = storyboard.instantiateViewController(withIdentifier: "YourRootViewControllerIdentifier") as! UINavigationController
    let childViewController = storyboard.instantiateViewController(withIdentifier: "YourChildViewControllerIdentifier") as! YourCustomChildViewController

    rootViewController.pushViewController(childViewController, animated: true)

    self.window?.rootViewController = rootViewController
    self.window = UIWindow.init(frame: UIScreen.main.bounds)
    self.window?.makeKeyAndVisible()
}

I have not tested yet. Let me know if it's works! Good luck