first commit

ios/ImageNotification/NotificationService.swift

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+import FirebaseMessaging
+import UserNotifications
+
+class NotificationService: UNNotificationServiceExtension {
+
+    var contentHandler: ((UNNotificationContent) -> Void)?
+    var bestAttemptContent: UNMutableNotificationContent?
+
+    override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
+        self.contentHandler = contentHandler
+        bestAttemptContent = request.content
+          .mutableCopy() as? UNMutableNotificationContent
+        guard let bestAttemptContent = bestAttemptContent else { return }
+        FIRMessagingExtensionHelper().populateNotificationContent(
+          bestAttemptContent,
+          withContentHandler: contentHandler)
+    }
+    
+    override func serviceExtensionTimeWillExpire() {
+        // Called just before the extension will be terminated by the system.
+        // Use this as an opportunity to deliver your "best attempt" at modified content, otherwise the original push payload will be used.
+        if let contentHandler = contentHandler, let bestAttemptContent =  bestAttemptContent {
+            contentHandler(bestAttemptContent)
+        }
+    }
+
+}