SwiftUI ObjectBinding in a UIViewRepresentable

uiviewrepresentable-objectbinding.swift

struct LotMapWrapperView: View {
    
    @EnvironmentObject var store: ParkingStore
    
    var body: some View {
        LotMapView(store: store)
    }
}

struct LotMapView: UIViewRepresentable {
    
    @ObjectBinding var store: ParkingStore

    func makeUIView(context: UIViewRepresentableContext<LotMapView>) -> MKMapView {
        MKMapView()
    }
    
    func updateUIView(_ view: MKMapView, context: UIViewRepresentableContext<LotMapView>) {
        // This is not getting called when store sends didChange :(
        print("Update view")
        print(store.parkingLots.count)
    }
}

I noticed same thing. @binding works, but I don't want to pass a bunch of individual state vars through. Have you found a solution?

Yes, I believe this is a bug. If you add any class property to the UIViewRepresentable, suddenly the bindings do trigger:

class RandomClass { }
let x = RandomClass()

Maybe late but you can build your own Binding and pass whatever object you need, @EnvironmentObject or @ObservedObject.
Looks like @FetchRequest works well inside UIViewRepresentable (if you are using Core Data)

struct ContentView: View {

    @EnvironmentObject var store: Store<AppState, AppAction> 

    var body: some View {
        MapViewRepresentable(state: Binding<AppState>(get: { self.store.state }, set { _ in}))
    }
}

struct MapViewRepresentable: UIViewRepresentable {

      @Binding var state: AppState
      [...]
}

Has anyone found a better solution for this yet? Getting the same results - @Binding works, @ObservedObject and @EnvironmentObject only works with class RandomClass { } let x = RandomClass()

I have had great issues trying to get updateUIView to call on binding changes on iOS14. The class RandomClass { } let x = RandomClass() hack works perfectly.