<!--
{
  "availability" : [
    "visionOS: 26.4.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "SwiftUI",
  "identifier" : "/documentation/SwiftUI/OpenImmersiveSpaceAction/callAsFunction(foveatedStreaming:)",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "SwiftUI"
    ],
    "preciseIdentifier" : "s:7SwiftUI24OpenImmersiveSpaceActionV17FoveatedStreamingE14callAsFunction08foveatedH0AC6ResultOAD0gH7SessionC_tYaF"
  },
  "title" : "callAsFunction(foveatedStreaming:)"
}
-->

# callAsFunction(foveatedStreaming:)

Presents the immersive space that your app defines for the specified foveated streaming session.

```
@discardableResult @MainActor func callAsFunction(foveatedStreaming session: FoveatedStreamingSession) async -> OpenImmersiveSpaceAction.Result
```

## Parameters

`session`

The foveated streaming session associated with the immersive space to present.

## Discussion

Don’t call this method directly. SwiftUI calls it when you call the `<doc://com.apple.documentation/documentation/swiftui/environmentvalues/openimmersivespace>` action with a foveated streaming session:

```swift
await openImmersiveSpace(foveatedStreaming: session)
```

For information about how Swift uses the `callAsFunction()` method to
simplify call site syntax, see
[Methods with Special Names](https://docs.swift.org/swift-book/ReferenceManual/Declarations.html#ID622)
in *The Swift Programming Language*.

---

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)