---
title: "previewContext(_:)"
framework: swiftui
role: symbol
role_heading: Instance Method
path: "swiftui/view/previewcontext(_:)"
---

# previewContext(_:)

Declares a context for the preview.

## Declaration

```swift
nonisolated func previewContext<C>(_ value: C) -> some View where C : PreviewContext

```

## Parameters

- `value`: The context for the preview; the default is nil.

## See Also

### Setting a context

- [PreviewContext](swiftui/previewcontext.md)
- [PreviewContextKey](swiftui/previewcontextkey.md)