# init(identifier:content:trigger:) Creates a notification request object that you use to schedule a notification. ``` convenience init(identifier: String, content: UNNotificationContent, trigger: UNNotificationTrigger?) ``` ## Parameters `identifier` An identifier for the request; this parameter must not be `nil`. You can use this identifier to cancel the request if it’s still pending (see the [`removePendingNotificationRequests(withIdentifiers:)`](/documentation/UserNotifications/UNUserNotificationCenter/removePendingNotificationRequests(withIdentifiers:)) method). `content` The content of the notification. This parameter must not be `nil`. `trigger` The condition that causes the system to deliver the notification. Specify `nil` to deliver the notification right away. ## Return Value A new notification request object. ## Discussion Use this method when you want to schedule the delivery of a local notification. This method creates the request object that you subsequently pass to the [`add(_:withCompletionHandler:)`](/documentation/UserNotifications/UNUserNotificationCenter/add(_:withCompletionHandler:)) method. The system uses the `identifier` parameter to determine how to handle the request: - **If you provide a unique identifier,** the system creates a new notification. - **If the identifier matches a previously delivered notification,** the system alerts the user again, replaces the old notification with the new one, and places the new notification at the top of the list. - **If the identifier matches a pending request,** the new request replaces the pending request. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)