---
title: containerIdentifier
framework: cloudkit
role: symbol
role_heading: Instance Property
path: cloudkit/cknotification/containeridentifier
---

# containerIdentifier

The ID of the container with the content that triggers the notification.

## Declaration

```swift
var containerIdentifier: String? { get }
```

## Discussion

Discussion Use this property to determine the location of the changed content.

## See Also

### Identifying the Notification

- [notificationID](cloudkit/cknotification/notificationid.md)
- [CKNotification.ID](cloudkit/cknotification/id.md)
- [notificationType](cloudkit/cknotification/notificationtype-swift.property.md)
- [CKNotification.NotificationType](cloudkit/cknotification/notificationtype-swift.enum.md)