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# init(_:windowStyle:traits:body:cameras:)

Creates a preview of a SwiftUI view in a window with
custom viewpoints.

```
@MainActor init(_ name: String? = nil, windowStyle: some WindowStyle, traits: PreviewTrait<Preview.ViewTraits>..., @ContentBuilder body: @escaping @MainActor () -> any View, @PreviewCameraBuilder cameras: () -> [PreviewCamera] = { return [] })
```

## Parameters

`name`

An optional display name for the preview.

`windowStyle`

The window style to use for the preview.

`traits`

An optional list of
<doc://com.apple.documentation/documentation/DeveloperToolsSupport/PreviewTrait>
instances that customize the appearance of the preview.

`body`

A content builder that produces a SwiftUI view to preview.

`cameras`

One or more preview cameras that indicate the custom, fixed
viewpoints that you want to be able to view the preview from.

## Discussion

Preview macros expand into a declaration that calls this initializer.
Don’t use this initializer directly. Instead use one of the macros, like
<doc://com.apple.documentation/documentation/SwiftUI/Preview(_:windowStyle:traits:body:cameras:)>.

---

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