A view that IS SwiftUI

The shift: conform, don't wrap

In the sensor course your view was class DepthScannerView: ExpoView — a UIKit view that hosted something. Here your view is a struct that conforms to ExpoSwiftUI.View — it doesn't host SwiftUI, it is SwiftUI. That one change unlocks everything @expo/ui does.

Three pieces make a primitive:
1. a props class (@Field-annotated, an observable object),
2. a SwiftUI struct conforming to ExpoSwiftUI.View with @ObservedObject var props,
3. registration in the module definition.

Red flag: reaching for the UIKit-wrapping ExpoView style here. That's right for an AR camera surface, but for a native control it means re-hosting SwiftUI by hand and losing the reactive @Field → body binding. When the view genuinely is SwiftUI, conform to ExpoSwiftUI.View instead of wrapping.