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

# objectWillChange

A publisher that publishes completion ring states when events change in the store.

## Declaration

```swift
let objectWillChange: CurrentValueSubject<[OCKCompletionRingButton.CompletionState], Never>
```