---
title: "callAsFunction(foveatedStreaming:)"
framework: swiftui
role: symbol
role_heading: Instance Method
path: "swiftui/openimmersivespaceaction/callasfunction(foveatedstreaming:)"
---

# callAsFunction(foveatedStreaming:)

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

## Declaration

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

## Parameters

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

## Discussion

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: await openImmersiveSpace(foveatedStreaming: session) For information about how Swift uses the callAsFunction() method to simplify call site syntax, see Methods with Special Names in The Swift Programming Language.