结合 MKLocalSearchCompleter 和 CoreLocation

问题描述

我尝试制作一个带有文本字段的应用程序，让用户输入位置，使用 MKLocalSearchCompleter 完成搜索。之后我想获取坐标并显示在 MapKit 上。但是，我无法使用地理编码器获取坐标。

class LocationSearchService: NSObject,ObservableObject,MKLocalSearchCompleterDelegate {
    @Published var searchQuery = ""
    var completer: MKLocalSearchCompleter
    @Published var completions: [MKLocalSearchCompletion] = []
    var cancellable: AnyCancellable?
    
    override init() {
        completer = MKLocalSearchCompleter()
        super.init()
        cancellable = $searchQuery.assign(to: \.queryFragment,on: self.completer)
        completer.delegate = self
    }
    
    func completerDidUpdateResults(_ completer: MKLocalSearchCompleter) {
        self.completions = completer.results
    }
}

位置管理器如下：

class LocationManager: NSObject,ObservableObject {
    
    private let locationManager = CLLocationManager()
    private let geocoder = CLGeocoder()
    
    let objectwillChange = PassthroughSubject<Void,Never>()
    
    @Published var status: CLAuthorizationStatus? {
        willSet { objectwillChange.send() }
    }
    
    @Published var location: CLLocation? {
        willSet { objectwillChange.send() }
    }
    
    override init() {
        super.init()
        
        self.locationManager.delegate = self
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
        self.locationManager.requestWhenInUseAuthorization()
        self.locationManager.startUpdatingLocation()
    }
    
    @Published var placemark: CLPlacemark? {
        willSet { objectwillChange.send() }
    }
    
    private func lookupLocation() {
        guard let location = self.location else { return }
        geocoder.reverseGeocodeLocation(location,completionHandler: { (places,error) in
            if error == nil {
                self.placemark = places?[0]
            } else {
                self.placemark = nil
            }
        })
    }
    
    // !!! This is the function I would like to use to get the Coordinate from the address obtained from LocationSearchService
    func getCoordinate(address: String) {
        geocoder.geocodeAddressstring(address,error) in
            if error == nil {
                self.placemark = places?[0]
                self.location = self.placemark?.location
            } else {
                self.placemark = nil
                self.location = nil
            }
        })
    }
    
}

extension LocationManager: CLLocationManagerDelegate {
    func locationManager(_ manager: CLLocationManager,didChangeAuthorization status: CLAuthorizationStatus) {
        self.status = status
    }
    
    func locationManager(_ manager: CLLocationManager,didUpdateLocations locations: [CLLocation]) {
        guard let location = locations.last else { return } //.first or .last?
                    
        self.location = location
        self.lookupLocation()
    }
}

内容视图如下：

struct ContentView: View {
    
    @State private var location: String = ""
    
    @Observedobject var lm = LocationManager()
    
    private let completer = MKLocalSearchCompleter()
        
    @Observedobject var locationSearchService = LocationSearchService()
    
    var body: some View {
        
        NavigationView {
            vstack {
                AddressSearchBar(text: $locationSearchService.searchQuery)
                List(locationSearchService.completions,id: \.self) { completion in
                    vstack(alignment: .leading) {
                        Text(completion.title)    
                    
                        // Error here,I cannot translate the address to location 
                        //Text(lm.getCoordinate(address: completion.title))
                    }
                }.navigationTitle("Search Location")
            }
        }

这里有几个问题：

1. 我想将用户选择的项目（我在此处未能实现）转换为地址 (completion.title) -- 即，需要让用户选择建议的项目。
2. 我想将建议中找到的地址转换为坐标，以便我可以在 MapView 上进行标记。

解决方法

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