How to retrieve realm object from different function? Swift

Question

I currently have a function that writes a realm object into the database and writes a notification. When the object is written, it is added into a uicollectionview and displayed. The function below adds the object and sets a notification based on a UIDatePicker. That code is not shown since it is a lot that doesn't pertain to the problem:

func createTaskWithDate() {
   let task = Task()
 task.name = textField.text!
 //notification code under here
 try! realm.write {
 realm.add(task)
 updateData()
    }

I also have another function that responds to an action on a notification set. When the user taps on the notification, they are given the option to "mark as complete". When the user taps "mark as complete", I am trying to retrieve the object from the "createTaskWithDate()" method and delete it from the collection view however I'm unsure on how to retrieve that object from that method:

 func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
    let identifier = response.actionIdentifier
    let request = response.notification.request
    if identifier == "complete" {
        try! realm.write {
            //realm.delete(task object from createTaskWithDate())
        updateData()

        }
    }
    completionHandler()
}

How could I go about doing this?

Answer 1

When setting up the notification, you should store the name/primary key of the object the notification is about in your notification request. You can store any information in UNMutableNotificationContent.userInfo and access it in userNotificationCenter(_:didReceive:withCompletionHandler:) by

let userInfo = response.notification.content.userInfo.

Then you can retrieve the object from Realm with the primary key stored in userInfo.