---
title: objectWillChange
framework: CareKit
role: symbol
role_heading: Instance Property
platforms: [iOS 13.0+, Mac Catalyst 13.0+, watchOS 7.0+]
path: carekit/ockchartcontrollerprotocol/objectwillchange
---

# objectWillChange

A publisher that publishes new values when the watched data series changes in the store.

## Declaration

```swift
var objectWillChange: CurrentValueSubject<[OCKDataSeries], Never> { get }
```

## See Also

### Tracking Changes

- [store](carekit/ockchartcontrollerprotocol/store.md)