---
title: "didApplyChanges(instanceIdentifier:operationIdentifier:)"
framework: spatialpreview
role: symbol
role_heading: Instance Method
platforms: [macOS 27.0+]
path: "spatialpreview/usdpreviewsession/changelistdelegate/didapplychanges(instanceidentifier:operationidentifier:)"
---

# didApplyChanges(instanceIdentifier:operationIdentifier:)

An event emitted to the ChangelistDelegate indicating the end of a USD change.

## Declaration

```swift
@MainActor func didApplyChanges(instanceIdentifier: String, operationIdentifier: UInt)
```

## Parameters

- `instanceIdentifier`: The Spatial Preview receiver instance making the change.
- `operationIdentifier`: Multiple changes with the same operation identifier can be grouped together.