<!--
{
  "availability" : [
    "macOS: 10.15.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "SwiftUI",
  "identifier" : "/documentation/SwiftUI/NSViewControllerRepresentable/updateNSViewController(_:context:)",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "SwiftUI"
    ],
    "preciseIdentifier" : "s:7SwiftUI29NSViewControllerRepresentableP06updatecD0_7contexty0cD4TypeQz_AA0cdE7ContextVyxGtF"
  },
  "title" : "updateNSViewController(_:context:)"
}
-->

# updateNSViewController(_:context:)

Updates the state of the specified view controller with new information
from SwiftUI.

```
@MainActor @preconcurrency func updateNSViewController(_ nsViewController: Self.NSViewControllerType, context: Self.Context)
```

## Parameters

`nsViewController`

Your custom view controller object.

`context`

A context structure containing information about the current
state of the system.

## Discussion

When the state of your app changes, SwiftUI updates the portions of your
interface affected by those changes. SwiftUI calls this method for any
changes affecting the corresponding AppKit view controller. Use this
method to update the configuration of your view controller to match the
new state information provided in the `context` parameter.

---

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)