<!--
{
  "availability" : [
    "iOS: 13.0.0 -",
    "iPadOS: 13.0.0 -",
    "macCatalyst: -",
    "macOS: 10.15.0 -",
    "tvOS: 13.0.0 -",
    "visionOS: -",
    "watchOS: 6.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "ObjectiveC",
  "identifier" : "/documentation/ObjectiveC/NSObject-swift.class/KeyValueObservingPublisher/didChange()",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "Objective-C Runtime",
      "Foundation"
    ],
    "preciseIdentifier" : "s:So8NSObjectC10FoundationE26KeyValueObservingPublisherV9didChange7Combine10PublishersO3MapVy_AEy_xq_GytGyF"
  },
  "title" : "didChange()"
}
-->

# didChange()

Returns a publisher that emits values when a KVO-compliant property changes.

```
func didChange() -> Publishers.Map<NSObject.KeyValueObservingPublisher<Subject, Value>, Void>
```

## Return Value

A key-value observing publisher.

---

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)