We tried using two modern Swift concurrency tools to allow us to embrace non-sendability:
• nonisolated(nonsending)
• Task.immediate
They got us close to our goals, but sadly there were still data races. Watch this week's episode to understand why:
www.pointfree.co/episodes/ep3...
![Code from Apple's SampleTrips WWDC26 project (with problem areas highlighted):
struct TripMap: View {
@Environment(\.modelContext) private var modelContext
@Binding var selection: Trip?
@State private var mapController: MapCameraController?
@State private var mapSelection: MapSelection<Trip>?
init(selection: Binding<Trip?>) {
self._selection = selection
}
private var cameraPosition: Binding<MapCameraPosition> {
Binding(
get: { mapController?.cameraPosition ?? .automatic },
set: { mapController?.cameraPosition = $0 }
)
}
var body: some View {
Map(position: cameraPosition, selection: $mapSelection) {
ForEach(mapController?.trips ?? []) { (trip: Trip) in
if let location = trip.location {
Marker(trip.name, coordinate: location.coordinate)
.tint(trip.color)
.tag(MapSelection(trip))
}
}
}
.onAppear {
self.mapController = MapCameraController(modelContext: modelContext)](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:jij7pkovdqzb3vqdgm2w4ibh/bafkreifqifduejc43dnvnleh7yotdmrckxr46zqccjdvpvbqjrpmz2mgke)
