---
title: invalidate()
framework: corelocation
role: symbol
role_heading: Instance Method
path: corelocation/clbackgroundactivitysession-3mzv3/invalidate()
---

# invalidate()

Invalidates the background activity session.

## Declaration

```swift
final func invalidate()
```

## Discussion

Discussion This method ends the session immediately. The system terminates any UI that displays a visual indication to this background session. After you invalidate a session, it can’t become active again and you need to create a new session to begin receiving updates again.