<!--
{
  "availability" : [
    "iOS: 13.0.0 -",
    "iPadOS: 13.0.0 -",
    "macCatalyst: 13.0.0 -",
    "macOS: 10.15.0 -",
    "tvOS: 13.0.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 6.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Combine",
  "identifier" : "/documentation/Combine/ObservableObject/ObjectWillChangePublisher",
  "metadataVersion" : "0.1.0",
  "role" : "Associated Type",
  "symbol" : {
    "kind" : "Associated Type",
    "modules" : [
      "Combine"
    ],
    "preciseIdentifier" : "s:7Combine16ObservableObjectP0C19WillChangePublisherQa"
  },
  "title" : "ObjectWillChangePublisher"
}
-->

# ObjectWillChangePublisher

The type of publisher that emits before the object has changed.

```
associatedtype ObjectWillChangePublisher : Publisher = ObservableObjectPublisher where Self.ObjectWillChangePublisher.Failure == Never
```

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)