Calendar Based Local Notification Not Working - Swift 3 - ios

Question

I have setup a local notification system so that I can fire a notification at a certain time every day. This time is determined by the user and I store it as a string. I will break down all the steps I have done in the code to follow but basically, my problem is that the notification won't fire.
Step 1:
In this step I setup an alert to ask permission to send a notification:
let center = UNUserNotificationCenter.current()
let options: UNAuthorizationOptions = [.alert, .badge, .sound]
center.requestAuthorization(options: options) { (granted, error) in
if granted {
application.registerForRemoteNotifications()
}
}
Step 2:
In this step I setup the function I call to send a notification:
static func sendNotification(stringDate: String) {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "HH:mm"
let content = UNMutableNotificationContent()
content.title = "Title"
content.body = "Detail"
content.badge = 1
if let date = dateFormatter.date(from: stringDate) {
let calendar = Calendar.current
let hour = calendar.component(.hour, from: date)
let minute = calendar.component(.minute, from: date)
var dateComponents = DateComponents()
dateComponents.hour = hour
dateComponents.minute = minute
let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: true)
let request = UNNotificationRequest(identifier: "dateDone", content: content, trigger: trigger)
UNUserNotificationCenter.current().add(request, withCompletionHandler: nil)
}
}
Step 3:
I then call this function in my app delegate file like so:
func applicationDidEnterBackground(_ application: UIApplication) {
let defaults = UserDefaults.standard
if defaults.object(forKey: "currentUser") != nil {
if User.current.desiredTimeForNews.characters.contains("A") {
let stringToBeConverted = User.current.desiredTimeForNews.replacingOccurrences(of: "AM", with: "")
HelperFunctions.sendNotification(stringDate: stringToBeConverted)
} else {
let stringToBeConverted = User.current.desiredTimeForNews.replacingOccurrences(of: "PM", with: "")
HelperFunctions.sendNotification(stringDate: stringToBeConverted)
}
}
}
IMPORTANT: As you can see within my function I take in a "stringDate" parameter. This variable has a string value of my date. I then convert this to a date value. Through using breakpoints and print statements I have seen that all my values including the date, hour, minute, etc are all NOT nil.
Overall, my problem is that the notification is never sent. However I know for a fact that it is called as I have used breakpoints to prove that. Any help would be appreciated!

Answer 1

For me personally, I ran it on a real device and it worked. Although it should work on a simulator it didn't for me. So I would try and run it on a real device before looking at anything else!

Answer 2

The code seems to be ok. Should work on the device and also on the simulator. My guess is that the trigger time just happens at a different time, then what you would expect.
Insert this check below after your setup to see the details:
UNUserNotificationCenter.current()
.getPendingNotificationRequests(completionHandler: { requests in
for (index, request) in requests.enumerated() {
print("notification: \(index) \(request.identifier) \(request.trigger)")
}
})
note 1:Why do you have this line in the code?
application.registerForRemoteNotifications()
note 2:You should check if the requestAuthorization went through ok. With something like this:
UNUserNotificationCenter.current().getNotificationSettings { (settings) in
guard (settings.authorizationStatus == .authorized )
else { print("notifsetup not authorized");return }
guard (settings.soundSetting == .enabled) else {
print("notifsetup sound not enabled");return }
}