---
title: "addObserver(_:)"
framework: pencilkit
role: symbol
role_heading: Instance Method
path: "pencilkit/pktoolpicker/addobserver(_:)"
---

# addObserver(_:)

Adds the specified object to the list of objects to notify when the picker configuration changes.

## Declaration

```swift
func addObserver(_ observer: any PKToolPickerObserver)
```

## Parameters

- `observer`: The object to notify when changes occur.

## See Also

### Detecting changes to the picker

- [removeObserver(_:)](pencilkit/pktoolpicker/removeobserver(_:).md)
- [PKToolPickerObserver](pencilkit/pktoolpickerobserver.md)