initial

ios/ImageNotification/NotificationService.m

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+//
+//  NotificationService.m
+//  ImageNotification
+//
+//  Created by Nils Weber on 04.02.22.
+//
+
+#import "NotificationService.h"
+#import "FirebaseMessaging.h"
+
+@interface NotificationService ()
+
+@property (nonatomic, strong) void (^contentHandler)(UNNotificationContent *contentToDeliver);
+@property (nonatomic, strong) UNMutableNotificationContent *bestAttemptContent;
+
+@end
+
+@implementation NotificationService
+
+- (void)didReceiveNotificationRequest:(UNNotificationRequest *)request withContentHandler:(void (^)(UNNotificationContent * _Nonnull))contentHandler {
+    self.contentHandler = contentHandler;
+    self.bestAttemptContent = [request.content mutableCopy];
+    
+    [[FIRMessaging extensionHelper] populateNotificationContent:self.bestAttemptContent withContentHandler:contentHandler];
+}
+
+- (void)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.
+    self.contentHandler(self.bestAttemptContent);
+}
+
+@end