Setting UserNotification with date from a realm database swift - ios

Question

I am trying to create a notification based on date and time specified by a user for an application I am working on. I am able to save user's date and retrieve. I now want a notification to pop up when the user's specified date has arrived just like an reminder thing. I can create a notification with with hard coded values but now retriving from the Real database to pass into the trigger value is what I am unable to do. my codes are specified below
func notifcation() -> Void {
let calendar = Calendar.current
let components = DateComponents(year: 2018, month: 09, day: 08, hour: 18, minute: 55) // Set the date here when you want Notification
let date = calendar.date(from: components)
let comp2 = calendar.dateComponents([.year,.month,.day,.hour,.minute], from: date!)
let trigger = UNCalendarNotificationTrigger(dateMatching: comp2, repeats: true)
let content = UNMutableNotificationContent()
content.title = "Don't forget"
content.body = "Buy some milk"
content.sound = UNNotificationSound.default()
let identifier = "UYLLocalNotification"
let request = UNNotificationRequest(identifier: identifier,
content: content, trigger: trigger)
center.add(request, withCompletionHandler: { (error) in
if let error = error {
// Something went wrong
print(error as Any)
}
})
}
then I call notification() in my viewDidLoad
Model
class ListModel: Object {
#objc dynamic var createdDate: Date?
#objc dynamic var remiderDate: Date?
}
based on Sh answer
My function
func getDataFromDB() -> Results<ListModel>? {
let todoListArray: Results<ListModel> = database.objects(ListModel.self)
return todoListArray
}
my viewdidLoad was now
TodoListFunctions.instance.getDataFromDB()?.forEach({ (list) in
notifcation(list.remiderDate)
})
in my AppDelegate for Permission
let center = UNUserNotificationCenter.current()
let options: UNAuthorizationOptions = [.alert, .sound]
center.requestAuthorization(options: options) {
(granted, error) in
if !granted {
print("Something went wrong")
}
}
further codes would be supplied on request

Answer 1

You can try
let allList = self.database.objects(ListModel.self)
allList.forEach{ notifcation($0.remiderDate) }
//
func notifcation(_ reminder:Date?) -> Void {
guard let date = reminder else { return }
let comp2 = calendar.dateComponents([.year,.month,.day,.hour,.minute], from: date)
let trigger = UNCalendarNotificationTrigger(dateMatching: comp2, repeats: true)
let content = UNMutableNotificationContent()
content.title = "Don't forget"
content.body = "Buy some milk"
content.sound = UNNotificationSound.default()
let identifier = "\(date)" // identider should be different for each one
let request = UNNotificationRequest(identifier: identifier,
content: content, trigger: trigger)
center.add(request, withCompletionHandler: { (error) in
if let error = error {
// Something went wrong
print(error as Any)
}
})
}
//
Set the delegate inside AppDelegte
UNUserNotificationCenter.current().delegate = self
and notice the print from
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: #escaping (UNNotificationPresentationOptions) -> Void) {
completionHandler([.alert, .sound])
}
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: #escaping () -> Void) {
print("notification received")
}