iOS UNUserNotifications Learning

The trigger is the main this. We can either use TimeInterval or Calendar Trigger.
For repeating intervals, 60 seconds or more must be the minimum between two repeating ones.
Does it actually apply for non repeating? For e.g. If we set 5 different alarms separately
With 5 different identifiers, do they fire? To be checked!

From the investigations by doing sample, the info that I could collect is that we are not able to
Get the notification even if not repeat is set to true and even if the identifier is set as unique one,
It just posts for 2 and then it stops posting!. Not sure if it is something specific to testing


OK with a bit of investigation, the crux is around the type of trigger. The time interval trigger could be used
For repeating ones.

Below setup works well to repeat the notification every X times

let content = UNMutableNotificationContent()
        content.title = "Pizza Time!!"
        content.body = "Monday is Pizza Day"

var timeInterval : TimeInterval = 60;

let trigger = UNTimeIntervalNotificationTrigger(
            timeInterval: timeInterval,
            repeats: true)
        content.title = "Pizza Time!! "
        let request = UNNotificationRequest(identifier: baseID, content: content, trigger: trigger)
       
        UNUserNotificationCenter.current().add(request) { (error) in
            if let error = error {
                print("error in pizza reminder: \(error.localizedDescription)")
            }
        }


Now as per documentation, we should not have < 60 seconds for a repeating one.

This works best if schedule every X second using scheduler interval than calendar date.


References:
https://makeapppie.com/2017/01/31/how-to-repeat-local-notifications/