<!--
{
  "availability" : [
    "iOS: 17.0.0 -",
    "iPadOS: 17.0.0 -",
    "macCatalyst: -",
    "tvOS: 17.0.0 -",
    "visionOS: -"
  ],
  "documentType" : "symbol",
  "framework" : "UIKit",
  "identifier" : "/documentation/UIKit/UIApplication/activateSceneSession(for:errorHandler:)",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "UIKit"
    ],
    "preciseIdentifier" : "s:So13UIApplicationC5UIKitE20activateSceneSession3for12errorHandleryAC07UISceneE17ActivationRequestV_ys5Error_pcSgtF"
  },
  "title" : "activateSceneSession(for:errorHandler:)"
}
-->

# activateSceneSession(for:errorHandler:)

Asks the system to activate an existing scene or create a new scene and associate it with your app.

```
@MainActor @preconcurrency func activateSceneSession(for request: UISceneSessionActivationRequest, errorHandler: ((any Error) -> Void)? = nil)
```

## Parameters

`request`

The activation request.

`errorHandler`

A handler to call if the request fails.

## See Also

[`-  requestSceneSessionActivation:userActivity:options:errorHandler:`](/documentation/UIKit/UIApplication/requestSceneSessionActivation(_:userActivity:options:errorHandler:))

Asks the system to activate an existing scene, or create a new scene and associate it with your app.


---

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)