Get local notification's body text or identifier in AppDelegate Swift

Question

I want to access my application data in AppDelegate.swift whenever the app receives an action response. I was trying to use the

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

    if response.actionIdentifier == "check" {
        //do something to the app's data
    }

    completionHandler()

}

method, but I can't locate the data because I can't get the notification's identifier nor its body text. Could somebody help me on that? Thank you guys so much.

More Code:

//Setting content of the notification
let content = UNMutableNotificationContent()
content.title = "Scheduled Task"
content.body = taskDescriptionTextField.text!
content.badge = 1
content.sound = UNNotificationSound.default()
content.categoryIdentifier = "alertCategory"
//Setting time for notification trigger
let date = datePicker.date
let dateCompenents = Calendar.current.dateComponents([.year,.month,.day,.hour,.minute,.second], from: date)
let trigger = UNCalendarNotificationTrigger(dateMatching: dateCompenents, repeats: false)
//Adding Request
let request = UNNotificationRequest(identifier: taskDescriptionTextField.text!, content: content, trigger: trigger)
UNUserNotificationCenter.current().add(request, withCompletionHandler: nil)

Rahm

perhaps you missed out on something while implementing it. Please put up some more code. – Hosiery

thx for helping. I don't know how to get the identifier or the body content of the notification by calling the method didReceive response... Is there any way that I can send those data from the other ViewController to AppDelegate? More codes from ViewController below. – Rahm

might look into this tut:- appcoda.com/local-notifications-ios8 It covers all the basic stuff. – Hosiery

your settings for notification looks fine.. can you tell me again what do you want to do in the didReceive block? – Hosiery

I want to get the content.body text or the identifier of the UNNotificationRequest – Rahm

In the link you gave me, it cannot edit or delete a specific item. For my app, I would like to edit or delete a specific, single item which requests the local notification. – Rahm

Answer 1

Do:

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

    print("original identifier was : \(response.notification.request.identifier)")
    print("original body was : \(response.notification.request.content.body)")
    print("Tapped in notification")
}

Basically what it is, is that you get a UNNotificationResponse instance back. That object has two properties.

• var actionIdentifier: String
• var notification: UNNotification <-- You need to use this one.

Also a very very good tutorial for UNUserNotification framework can be found here

---

You only use the actionIdenfier if you want to find out which action did the user choose when they were presented a notification (Did they just just tap on it?! Did they just dismiss it?! Or did they select on a customAction?!)

// From Apple documentation: the action identifier that the user can chose from:

* UNNotificationDismissActionIdentifier if the user dismissed the notification
* UNNotificationDefaultActionIdentifier if the user opened the application from the notification
* the identifier for a registered UNNotificationAction for other actions

What it means is, you can use to do something like:

switch actionIdentifier {
case UNNotificationDismissActionIdentifier: // Notification was dismissed by user
    // Do something
    completionHandler()
case UNNotificationDefaultActionIdentifier: // App was opened from notification
    // Do something
    completionHandler()
    // Do something else
case customAction:
    completionHandler()   
default:
    completionHandler()
}

To create custom actions you must:

• create an action inside a category
• register the category

For more information see this moment from WWDC 2016 Advance Notifications

Landgraviate