# RoomTrackingProvider

## Context

RoomTrackingProvider supplies real-time information about the room a person is currently in. It publishes RoomAnchor updates and can provide the current room anchor when available.

## Best Practices

- Check `RoomTrackingProvider.isSupported` before creating the provider.
- Request `requiredAuthorizations` before running the session and handle denied states.
- Use `currentRoomAnchor` for the latest room state and `anchorUpdates` for changes.
- Treat room anchors as authoritative for spatial layout decisions.
- Run the provider in the presentation style Apple documents for that API, and keep the session and provider alive for the feature lifetime.

## Code Examples

```swift
import ARKit

@MainActor
final class RoomTrackingModel {
    private let session = ARKitSession()
    private let provider = RoomTrackingProvider()

    func start() async {
        guard RoomTrackingProvider.isSupported else { return }

        let results = await session.requestAuthorization(for: RoomTrackingProvider.requiredAuthorizations)
        guard results.values.allSatisfy({ $0 == .allowed }) else { return }

        do {
            try await session.run([provider])
        } catch {
            print("Room tracking failed: \(error)")
            return
        }

        Task {
            for await update in provider.anchorUpdates {
                handleRoomAnchor(update.anchor)
            }
        }
    }

    private func handleRoomAnchor(_ anchor: RoomAnchor) {}
}
```