---
title: configuration
framework: extensionkit
role: symbol
role_heading: Instance Property
path: extensionkit/exhostviewcontroller/configuration-swift.property
---

# configuration

The information the host view controller uses to fetch the appropriate scene from an app extension.

## Declaration

```swift
@MainActor @preconcurrency var configuration: EXHostViewController.Configuration? { get set }
```

## Mentioned in

Including extension-based UI in your interface

## See Also

### Configuring the view controller

- [EXHostViewController.Configuration](extensionkit/exhostviewcontroller/configuration-swift.struct.md)
- [placeholderView](extensionkit/exhostviewcontroller/placeholderview.md)