You can attach image files to your Apple notifications. Adding visual components can significantly increase your users' engagement with push notifications.

To receive rich push notifications in your iOS app:

1. Implement push messaging for the app by completing the steps in Push Messaging.

2. Verify that you can send a text push message to your app.

3. Add a Notification Service Extension by completing the following steps:

   1. In your Xcode project, select File > New > Target.
   2. Select Notification Service Extension.
   3. Verify that the NotificationService.m file exists.

4. Open the NotificationService.m file and verify that the following delegate methods exist:

   • One method to receive a notification request.

   • One method to handle the expiration of the service extension.

     To receive rich push notifications, the first method is used:

     (void)didReceiveNotificationRequest:(UNNotificationRequest *)request withContentHandler:(void (^)(UNNotificationContent *contentToDeliver))contentHandler;

     In this method, you can get the Media URL from userInfo by using the attachment-url key. After you download the file to a local directory, add the local path to bestAttemptContent.attachments.

     Here is an example of the code in this method:

     - (void)didReceiveNotificationRequest:(UNNotificationRequest *)request withContentHandler:(void (^)(UNNotificationContent * _Nonnull))contentHandler {
     self.contentHandler = contentHandler;
     self.bestAttemptContent = [request.content mutableCopy];
        NSDictionary* userInfo = request.content.userInfo;
     if(userInfo[@"attachment-url"]){
        NSURL* url = [[NSURL alloc] initWithString:userInfo[@"attachment-url"]];
        NSURLSessionDownloadTask* task = [[NSURLSession sharedSession] downloadTaskWithURL:url completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) {
            if(!location){
                return;
            }
            NSString* tmpDirectory = NSTemporaryDirectory();
            NSString* tmpFilePath = [NSString stringWithFormat:@"file://%@%d%d%@", tmpDirectory, arc4random_uniform(100000),
                                   arc4random_uniform(100000), [url lastPathComponent]];
            NSURL* tmpUrl = [[NSURL alloc] initWithString:tmpFilePath];
            NSError * fileError = nil;
            [[NSFileManager defaultManager] moveItemAtURL:location toURL:tmpUrl error:&fileError];
            if(fileError){
                return;
            }
            UNNotificationAttachment* attachment = [UNNotificationAttachment attachmentWithIdentifier:@"video" URL:tmpUrl options:nil error:&fileError];
            if(fileError){
                return;
            }
            self.bestAttemptContent.attachments = @[attachment];
            self.contentHandler(self.bestAttemptContent);
        }];
        [task resume];
      }
     }

For more information about rich push notifications with iOS, see UNNotificationAttachment.