How to use Swift async/await for MKLocalPointsInterestRequests-CodePudding

For an app for visual impaired persons, I want to show POI's in a view. I use code below. Although the lowest level (requestNearbyLocations) prints info to the debug screen, I'm not able to return this data (locdata) to the calling method, so nor to the view.

Main extract of the code used:

struct ContentView: View {    
    var Apple: AppleData = AppleData()
    
    var body: some View {
        Text(Apple.text)
            .onAppear {
                Apple.requestLoc()
            }
        } 
}

With

class AppleData {
    
    var text = ""
    
    func requestLoc() -> Void {
        Task {
            async let mytext = requestNearbyLocations()
            text = await mytext
        }
    }
    
    func requestNearbyLocations() async -> String {
        var region = MKCoordinateRegion()
        region.center = CLLocationCoordinate2D(latitude: 52.060049, longitude: 4.542196)
        
        var loctext = ""
        let request = MKLocalPointsOfInterestRequest(center: region.center, radius: 100.0)
        request.pointOfInterestFilter = MKPointOfInterestFilter(excluding: [.restaurant, .cafe])
        let search = MKLocalSearch(request: request)
        
        do {
            let response = try await search.start()
            print(response.mapItems)
            for item in response.mapItems {
                print( item.name! )
                loctext = item.name!
            }
        }
        catch {
            print(error)
        }
        return loctext
    }    
}

What have I missed here?

CodePudding user response：

You want to “observe” changes in text.

Thus, declare AppleData to be an ObservableObject and text to be @Published:

class AppleData: ObservableObject {
    @Published var text = ""

    ...
}

And the ContentView should designate that object as an @ObservedObject:

struct ContentView: View {
    @ObservedObject var apple = AppleData()

    var body: some View {
        Text(apple.text)
            .onAppear {
                apple.requestLoc()
            }
    }
}

See Managing Model Data in Your App.