应用终止后，位置背景模式能否快速运行？

Question

Right now, I'm trying to implement the location background mode for my app. When the user location is updated, I'm going to schedule a notification (eventually I'll schedule them conditionally, but for right now I'm just scheduling them so I know it works). I have the following code:

 func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    if let location = locations.first {
        currentLocation = location
    }
    if UIApplication.shared.applicationState == .background {
    // if the app is in the background
         let notif = UNMutableNotificationContent()
    notif.title = "Location was updated"
    var message = " "
    notif.body = message
    let identifier = String(arc4random())
    var dc = DateComponents()
    var date = Date()
    date = Calendar.current.date(byAdding: .second, value: 3, to: date)!
    dc.hour = Calendar.current.component(.hour, from: date)
    dc.minute = Calendar.current.component(.minute, from: date)
    dc.second = Calendar.current.component(.second, from: date)
    let notifTrigger = UNCalendarNotificationTrigger(dateMatching: dc, repeats: false)
    let request = UNNotificationRequest(identifier: identifier, content: notif, trigger: notifTrigger)
    UNUserNotificationCenter.current().add(request, withCompletionHandler: { error in
        if error != nil {
            print(error!)
        } else {
            print("Notification scheduled!")
        }
    })

This works great when the app is in the background, but when the app gets terminated, my function isn't called, and the notifications aren't getting delivered. My question is: Is this possible with Swift? Or does the locationManager function I'm using only work if the app is backgrounded, but not terminated?

Side note: I've tried taking out if UIApplication.shared.applicationState == .background and it does not fix the problem

Answer 1

When you terminate the app, the normal* location services stop, until you run startUpdatingLocation from a non-background state.

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*visit Location Service, region monitoring, significant Location Changes are not normal location tracking and are managed on the OS level not app level.

Non-normal location tracking won't get stopped after app termination.

Answer 2

That's possible. Move the app so that location updates gets triggered. Check with accuracy as 100m and move your device or use simulator simulation for location. I am assuming that you have already given Use Location Always Permission