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# previewDevice(_:)

Overrides the device for a preview.

```
nonisolated func previewDevice(_ value: PreviewDevice?) -> some View
```

## Parameters

`value`

A device to use for preview, or `nil` to let Xcode
automatically choose a device based on the run destination.

## Return Value

A preview that uses the given device.

## Discussion

By default, Xcode automatically chooses a preview device based
on your currently selected run destination. If you want to
choose a device that doesn’t change based on Xcode settings,
provide a [`PreviewDevice`](/documentation/SwiftUI/PreviewDevice) instance that you initialize with
the name or model of a specific device:

```
struct CircleImage_Previews: PreviewProvider {
    static var previews: some View {
        CircleImage()
            .previewDevice(PreviewDevice(rawValue: "iPad Pro (11-inch)"))
    }
}
```

You can get a list of supported preview device names, like “iPhone 11”,
“iPad Pro (11-inch)”, and “Apple Watch Series 5 - 44mm”, by using the
`xcrun` command in the Terminal app:

```
% xcrun simctl list devicetypes
```

Additionally, you can use the following values for macOS platform
development:

- “Mac”
- “Mac Catalyst”

---

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