fired local notification at specific time - swift3

Question

please i have an issue about how can i trigger the local notification at specific time ? without user trigger it and need the app at specific time fired local notification
the following my code :
this is for get permission from the user
func registerLocal() {
let center = UNUserNotificationCenter.current()
center.requestAuthorization(options: [.alert, .badge, .sound]) { (granted, error) in
if granted {
print("Yay!")
} else {
print("D'oh")
}
}
}
// this i schedule local notification
func scheduleLocal() {
let center = UNUserNotificationCenter.current()
let content = UNMutableNotificationContent()
content.title = "Late wake up call"
content.body = "The early bird catches the worm, but the second mouse gets the cheese."
content.categoryIdentifier = "alarm"
content.userInfo = ["customData": "fizzbuzz"]
content.sound = UNNotificationSound.default()
var dateComponents = DateComponents()
dateComponents.hour = 3
dateComponents.minute = 19
dateComponents.day = 3
let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: true)
let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
center.add(request)
center.removeAllPendingNotificationRequests()
}
// her i call theses methods
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
registerLocal()
scheduleLocal()
return true
}
and when i close my app i have no receive the notification , please help about how can i trigger the local notification at specific time
thanks

Answer 1

You should not call center.removeAllPendingNotificationRequests() after adding your notification, since it will cancel the previously added pending notification as well. You should rather check after calling center.addRequest(request) whether your request has actually been added or not by
center.getPendingNotificationRequests(completionHandler: { pendingRequest in
print("Pending notifications: \(pendingRequest)") //Just for debugging
})
Or you can also specify a completion handler to addRequest, which will return an error if the request hasn't been added succesfully:
center.add(request, withCompletionHandler: { error in
print(error)
})