background - IOS Local Notification at specific time

Question

Below is what I am trying to achieve. Show local notification to the user about say sunrise/sunset time. Say sunrise time is at 05:30AM and sunset time at 06:30PM. Current time is 07:00PM, when the user enables the notification feature then every one hour show sunrise notification with info time left for sunrise ( that is x hours and y mins left) Once the time left for sunrise is less than 60 mins, then change the interval from one hour to say 10 mins. Finally when the time left for sunrise is less than 10 mins, then show notification for every minute. When the time for sunrise is reached repeat the same for sunset. This goes on till the user disable this feature via app settings.

Showing a countdown timer is also fine with in a notification if that doesn't drain the battery.

What I have achieved is fire a local notification at a specific time. Appreciate any guidance. I am new to IOS development.

let center = UNUserNotificationCenter.current()
      let content = UNMutableNotificationContent()
      content.title = title
      content.body = body
      content.categoryIdentifier = "sdf"
      
      if let info = userInfo {
        content.userInfo = info
      }
      
      content.sound = UNNotificationSound.default()
      
      var comp = Calendar.current.dateComponents([.hour, .minute], from: date)
      comp.minute = comp.minute! + 2
      
      let trigger = UNCalendarNotificationTrigger(dateMatching: comp, repeats: false)
      
      //let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
      
      let request = UNNotificationRequest(identifier: "test", content: content, trigger: trigger)
      
      center.add(request)

question from:https://stackoverflow.com/questions/65898782/ios-local-notification-at-specific-time

Answer 1

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