Recover a notification attachment

recoverAttachment.swift

import UIKit
import UserNotifications
import UserNotificationsUI
 
struct Attachments {
    static let image = (identifier:"image", jsonElement:"imageURL")
}
 
class ContentViewController: UIViewController, UNNotificationContentExtension
{
    @IBOutlet var kittenImage: UIImageView!
 
    func didReceive(_ notification: UNNotification)
    {
        if let image = imageIn(notification: notification, withIdentifier: Attachments.image.identifier) {
            self.kittenImage.image = image
        }
    }
 
    private func imageIn(notification:UNNotification, withIdentifier: String) -> UIImage?
    {
        var image: UIImage?
        let findImage: (UNNotificationAttachment)->Bool = { attachment in attachment.identifier == Attachments.image.identifier }
        if let attachment = notification.request.content.attachments.first(where: findImage) {
            if attachment.url.startAccessingSecurityScopedResource() {
                image = UIImage(contentsOfFile: attachment.url.path)
                attachment.url.stopAccessingSecurityScopedResource()
            }
        }
        return image
    }
}