---
title: threadIdentifier
framework: usernotifications
role: symbol
role_heading: Instance Property
path: usernotifications/unnotificationcontent/threadidentifier
---

# threadIdentifier

The identifier that groups related notifications.

## Declaration

```swift
var threadIdentifier: String { get }
```

## Discussion

Discussion For remote notifications, the system sets this property to the value of the thread-id key in the aps dictionary.

## See Also

### Retrieving group information

- [categoryIdentifier](usernotifications/unnotificationcontent/categoryidentifier.md)
- [summaryArgument](usernotifications/unnotificationcontent/summaryargument.md)
- [summaryArgumentCount](usernotifications/unnotificationcontent/summaryargumentcount.md)