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# UNNotificationInterruptionLevel

Constants that indicate the importance and delivery timing of a notification.

```
enum UNNotificationInterruptionLevel
```

## Topics

### Enumeration Cases

[`UNNotificationInterruptionLevel.active`](/documentation/UserNotifications/UNNotificationInterruptionLevel/active)

The system presents the notification immediately, lights up the screen, and can play a sound.

[`UNNotificationInterruptionLevel.critical`](/documentation/UserNotifications/UNNotificationInterruptionLevel/critical)

The system presents the notification immediately, lights up the screen, and bypasses the mute switch to play a sound.

[`UNNotificationInterruptionLevel.passive`](/documentation/UserNotifications/UNNotificationInterruptionLevel/passive)

The system adds the notification to the notification list without lighting up the screen or playing a sound.

[`UNNotificationInterruptionLevel.timeSensitive`](/documentation/UserNotifications/UNNotificationInterruptionLevel/timeSensitive)

The system presents the notification immediately, lights up the screen, can play a sound, and breaks through system notification controls.


---

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