---
title: "CFNotificationCenterRemoveObserver(_:_:_:_:)"
framework: Core Foundation
role: symbol
role_heading: Function
path: "corefoundation/cfnotificationcenterremoveobserver(_:_:_:_:)"
---

# CFNotificationCenterRemoveObserver(_:_:_:_:)

Stops an observer from receiving certain notifications.

## Declaration

```swift
func CFNotificationCenterRemoveObserver(_ center: CFNotificationCenter!, _ observer: UnsafeRawPointer!, _ name: CFNotificationName!, _ object: UnsafeRawPointer!)
```

## Parameters

- `center`: The notification center to modify.
- `observer`: The observer. This value must not be NULL.
- `name`: The name of the notification to stop observing. If NULL, observer stops receiving callbacks for all notifications posted by object.
- `object`: The object to stop observing. For distributed notifications, object must be a CFString object. If NULL, observer stops receiving callbacks for all objects posting notifications named name. If center is a Darwin notification center, this value is ignored.

## Discussion

Discussion If both name and object are NULL, this function unregisters observer from all the notifications for which it had previously registered with center.

## See Also

### Adding and Removing Observers

- [CFNotificationCenterAddObserver(_:_:_:_:_:_:)](corefoundation/cfnotificationcenteraddobserver(_:_:_:_:_:_:).md)
- [CFNotificationCenterRemoveEveryObserver(_:_:)](corefoundation/cfnotificationcenterremoveeveryobserver(_:_:).md)