---
title: didChange()
framework: objectivec
role: symbol
role_heading: Instance Method
path: objectivec/nsobject-swift.class/keyvalueobservingpublisher/didchange()
---

# didChange()

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

## Declaration

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

## Return Value

Return Value A key-value observing publisher.