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# CFRunLoopRemoveObserver(_:_:_:)

Removes a CFRunLoopObserver object from a run loop mode.

```
func CFRunLoopRemoveObserver(_ rl: CFRunLoop!, _ observer: CFRunLoopObserver!, _ mode: CFRunLoopMode!)
```

## Parameters

`rl`

The run loop to modify.

`observer`

The run loop observer to remove.

`mode`

The run loop mode of `rl` from which to remove `observer`. Use the constant [`commonModes`](/documentation/CoreFoundation/CFRunLoopMode/commonModes) to remove `observer` from the set of objects monitored by all the common modes.

## Discussion

If `rl` does not contain `observer` in `mode`, this function does nothing.

---

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