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# UNUserNotificationCenterDelegate

An interface for processing incoming notifications and responding to notification actions.

```
protocol UNUserNotificationCenterDelegate : NSObjectProtocol
```

## Overview

Use the methods of the [`UNUserNotificationCenterDelegate`](/documentation/UserNotifications/UNUserNotificationCenterDelegate) protocol to handle user-selected actions from notifications, and to process notifications that arrive when your app is running in the foreground. After implementing these methods in an object, assign that object to the [`delegate`](/documentation/UserNotifications/UNUserNotificationCenter/delegate) property of the shared [`UNUserNotificationCenter`](/documentation/UserNotifications/UNUserNotificationCenter) object. The user notification center object calls the methods of your delegate at appropriate times.

> Important:
> You must assign your delegate object to the ``doc://com.apple.usernotifications/documentation/UserNotifications/UNUserNotificationCenter`` object before your app finishes launching. For example, in an iOS app, you must assign it in the <doc://com.apple.documentation/documentation/UIKit/UIApplicationDelegate/application(_:willFinishLaunchingWithOptions:)> or <doc://com.apple.documentation/documentation/UIKit/UIApplicationDelegate/application(_:didFinishLaunchingWithOptions:)> method of your app delegate. Assigning a delegate after the system calls these methods might cause you to miss incoming notifications.

For information about the shared user notification center object, see [`UNUserNotificationCenter`](/documentation/UserNotifications/UNUserNotificationCenter).

## Topics

### First Steps

[Handling notifications and notification-related actions](/documentation/UserNotifications/handling-notifications-and-notification-related-actions)

Respond to user interactions with the system’s notification interfaces, including handling your app’s custom actions.

### Handling the Selection of Custom Actions

[`userNotificationCenter(_:didReceive:withCompletionHandler:)`](/documentation/UserNotifications/UNUserNotificationCenterDelegate/userNotificationCenter(_:didReceive:withCompletionHandler:))

Asks the delegate to process the user’s response to a delivered notification.

### Receiving Notifications

[`userNotificationCenter(_:willPresent:withCompletionHandler:)`](/documentation/UserNotifications/UNUserNotificationCenterDelegate/userNotificationCenter(_:willPresent:withCompletionHandler:))

Asks the delegate how to handle a notification that arrived while the app was running in the foreground.

[`UNNotificationPresentationOptions`](/documentation/UserNotifications/UNNotificationPresentationOptions)

Constants indicating how to present a notification in a foreground app.

[`UNNotificationPresentationOptionNone`](/documentation/UserNotifications/UNNotificationPresentationOptionNone)

No alert.

### Displaying Notification Settings

[`userNotificationCenter(_:openSettingsFor:)`](/documentation/UserNotifications/UNUserNotificationCenterDelegate/userNotificationCenter(_:openSettingsFor:))

Asks the delegate to display the in-app notification settings.


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