Add Amazon Location search to your application - Amazon Location Service

Add Amazon Location search to your application

You now will add reverse geocoding search to the application, where you find the items at a location. To simplify the use of an iOS app, we will search the center of the screen. To find a new location, move the map to where you want to search. We will place a marker at the center of the map to show where we are searching.

  1. Add the following code in `TrackingViewModel.swift` file which is related to the reverse geocoding search

    func reverseGeocodeCenter(centerCoordinate: CLLocationCoordinate2D, marker: MLNPointAnnotation) {
    let position = [NSNumber(value: centerCoordinate.longitude), NSNumber(value: centerCoordinate.latitude)]
    searchPositionAPI(position: position, marker: marker)
}

func searchPositionAPI(position: [Double], marker: MLNPointAnnotation) {
    if let amazonClient = authHelper.getLocationClient() {
        Task {
            let searchRequest = SearchPlaceIndexForPositionInput(indexName: indexName, language: "en" , maxResults: 10, position: position)
            let searchResponse = try? await amazonClient.searchPosition(indexName: indexName, input: searchRequest)
            DispatchQueue.main.async {
                self.centerLabel = searchResponse?.results?.first?.place?.label ?? ""
                self.mlnMapView?.selectAnnotation(marker, animated: true, completionHandler: {})
            }
        }
    }
}

  2. Update TrackingView.swift file with the following code which will show the mapview's centered location's address

    import SwiftUI

struct TrackingView: View {
    @ObservedObject var trackingViewModel: TrackingViewModel
    var body: some View {
        ZStack(alignment: .bottom) {
            if trackingViewModel.mapSigningIntialised {
                MapView(trackingViewModel: trackingViewModel)
                VStack {
                    UserLocationView(trackingViewModel: trackingViewModel)
                    CenterAddressView(trackingViewModel: trackingViewModel)
                }
            }
            else {
                Text("Loading...") 
            }
        }
        .onAppear() {
            if !trackingViewModel.identityPoolId.isEmpty {
                Task {
                    do {
                        try await trackingViewModel.authWithCognito(identityPoolId: trackingViewModel.identityPoolId)
                    }
                    catch {
                        print(error)
                    }
                }
            }
        }
    }
}