Get local notification when App is in foreground Swift 4 iOS 11

Question

I want to receive a Local notification when my app is in foreground, when I tried with below code it never fires a notification, but when I entered app in background it did fired.

here is what I tried:

//Schedule a Local Notification
func ScheduleNotification(timeInterval: Double, repeats: Bool, notificationBody:String, title:String){

    let trigger = UNTimeIntervalNotificationTrigger.init(timeInterval: timeInterval, repeats: repeats)

    let center = UNUserNotificationCenter.current()

    let identifier = "UYLLocalNotification"
    let content = UNMutableNotificationContent()
    content.title = title
    content.body = notificationBody
    content.sound = UNNotificationSound.default()
    let request = UNNotificationRequest(identifier: identifier, content: content, trigger: trigger)
    center.add(request, withCompletionHandler: { (error) in
        if let error = error {
            //Something went wrong
            print(error.localizedDescription)
        }
    })
}

override func viewDidLoad() {
    super.viewDidLoad()

    if Currentcount < data.count {
        self.ScheduleNotification(timeInterval: 5.0, repeats: false, notificationBody: "You have \(data.count - Currentcount) notification", title: "Alert!")
    }
}

Any help would be appreciated Thanks.

Answer 1

The notification probably also fires while you app is in foreground.

Per Default, iOS does not show any UI when a notification arrives and the target app is in the foreground. It is the applications job to display the notification contents. Using UNUserNotificationCenterDelegate you can very easily display the notification as an alert. See this post for more information.

Answer 2

Here I am showing you how the UNUserNotificationCenterDelegate is work step by step

1. In the AppDelegate: import UserNotifications

2. class AppDelegate: UIResponder,UNUserNotificationCenterDelegate{}

3. Assign the delegate method to self inside the didFinishLaunchingWithOptions

   func application(_application:UIApplication,
   didFinishLaunchingWithOptionslaunchoptions:[UIApplicationLaunchOptionsKey: Any]?) -> Bool {
   
          UIApplication.shared.applicationIconBadgeNumber = 0
               let center = UNUserNotificationCenter.current()
               center.delegate = self        
               center.requestAuthorization(options:[.badge, .alert, .sound]) { (granted, error) in
   
                   if granted {
                       DispatchQueue.main.async { // Correct
                           UIApplication.shared.registerForRemoteNotifications()
                       }
   
                   }
   
               }
   
       }
   

4. What you want to show in the Local Notification

        func assignValueToNotification
           {
               let content = UNMutableNotificationContent()
               content.body = "Asssign body"
               content.userInfo = ["identifier": "info"]
               content.sound = UNNotificationSound.default()
               content.badge = UIApplication.shared.applicationIconBadgeNumber + 1 as NSNumber;
               content.categoryIdentifier = "write category identifier"
               // Deliver the notification in five seconds.
               let trigger = UNTimeIntervalNotificationTrigger.init(timeInterval: 0.5, repeats: false)
               let request = UNNotificationRequest.init(identifier: region.identifier as String, content: content, trigger: trigger)
              // Schedule the notification.
              let center = UNUserNotificationCenter.current()
              center.add(request)
       }
   

5. write down you delegate method, that will be called when you click Local notification.

   func userNotificationCenter(_ center:UNUserNotificationCenter, didReceive response:UNNotificationResponse,withCompletionHandler completionHandler: @escaping () -> Void{
       print("Received Local Notification:")
   }