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# User Notifications UI

Customize the interface that displays local and remote notifications.

## Overview

Customize how local and remote notifications appear on the user’s device by adding
a notification content app extension to the bundle of your iOS app. Your extension
manages a custom view controller, which you use to present the content from incoming
notifications. When a notification arrives, the system displays your view controller
in addition to, or in place of, the default system interface.

## Topics

### Notification Content App Extension

[Customizing the Appearance of Notifications](/documentation/UserNotificationsUI/customizing-the-appearance-of-notifications)

Customize the appearance of your iOS app’s notification alerts with a notification
content app extension.

[`UNNotificationContentExtension`](/documentation/UserNotificationsUI/UNNotificationContentExtension)

An object that presents a custom interface for a delivered local or remote
notification.


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