我试图在 map View 中只显示医院，但我无法让它工作。我怎样才能做到这一点？请帮忙。目前，我正在使用注释并对它们进行单独编程以实现此目的，这就是为什么我想要一种更快的方式来显示该地区的所有医院。注释的部分是我尝试搜索医院然后显示它们的代码，但我只得到一个注释，我想要多个注释。

//
//  ViewController.swift
//  aidkit
//
//  Created by Roberto Guarneros on 1/18/19.
//  Copyright © 2019 Roberto Guarneros. All rights reserved.
//

import UIKit
import MapKit
import CoreLocation

class MapScreen: UIViewController{

    @IBOutlet weak var mapView: MKMapView!
    @IBOutlet weak var addressLabel: UILabel!
    @IBOutlet weak var goButton: UIButton!

    let locationManager = CLLocationManager()
    let regionInMeters: Double = 5000
    var previousLocation: CLLocation?

    let geoCoder = CLGeocoder()
    var directionsArray: [MKDirections] = []


    override func viewDidLoad() {
        super.viewDidLoad()
        checkLocationServices()
    }

    func setupLocationManager() {
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
    }


    func centerViewOnUserLocation() {
        if let location = locationManager.location?.coordinate {
            let region = MKCoordinateRegion.init(center: location, latitudinalMeters: regionInMeters, longitudinalMeters: regionInMeters)
            mapView.setRegion(region, animated: true)
        }
    }


    func checkLocationServices() {
        if CLLocationManager.locationServicesEnabled() {
            setupLocationManager()
            checkLocationAuthorization()
        } else {
            // Show alert letting the user know they have to turn this on.
        }
    }


    func checkLocationAuthorization() {
        switch CLLocationManager.authorizationStatus() {
        case .authorizedWhenInUse:
            startTackingUserLocation()
        case .denied:
            // Show alert instructing them how to turn on permissions
            break
        case .notDetermined:
            locationManager.requestWhenInUseAuthorization()
        case .restricted:
            // Show an alert letting them know what's up
            break
        case .authorizedAlways:
            break
        }
    }


    func startTackingUserLocation() {
        mapView.showsUserLocation = true
        centerViewOnUserLocation()
        locationManager.startUpdatingLocation()
        previousLocation = getCenterLocation(for: mapView)
    }


    func getCenterLocation(for mapView: MKMapView) -> CLLocation {
        let latitude = mapView.centerCoordinate.latitude
        let longitude = mapView.centerCoordinate.longitude

        return CLLocation(latitude: latitude, longitude: longitude)
    }


    func getDirections() {
        guard let location = locationManager.location?.coordinate else {
            //TODO: Inform user we don't have their current location
            return
        }

        let request = createDirectionsRequest(from: location)
        let directions = MKDirections(request: request)
        resetMapView(withNew: directions)

        directions.calculate { [unowned self] (response, error) in
            //TODO: Handle error if needed
            guard let response = response else { return } //TODO: Show response not available in an alert

            for route in response.routes {
                self.mapView.addOverlay(route.polyline)
                    self.mapView.setVisibleMapRect(route.polyline.boundingMapRect, animated: true)
            }
        }
     }


     func createDirectionsRequest(from coordinate: CLLocationCoordinate2D) -> MKDirections.Request {
        let destinationCoordinate       = getCenterLocation(for: mapView).coordinate
        let startingLocation            = MKPlacemark(coordinate: coordinate)
        let destination                 = MKPlacemark(coordinate: destinationCoordinate)

        let request                     = MKDirections.Request()
        request.source                  = MKMapItem(placemark: startingLocation)
        request.destination             = MKMapItem(placemark: destination)
        request.transportType           = .automobile
        request.requestsAlternateRoutes = true

        return request
     }


     func resetMapView(withNew directions: MKDirections) {
        mapView.removeOverlays(mapView.overlays)
        directionsArray.append(directions)
        let _ = directionsArray.map { $0.cancel() }
     }

     @IBAction func goButtonTapped(_ sender: UIButton) {
        getDirections()
        print("hello")
     }

    //    func startSearchingForHospitals(){
    //        UIApplication.shared.beginIgnoringInteractionEvents()
    //
    //        let activityIndicator = UIActivityIndicatorView()
    //        activityIndicator.style = UIActivityIndicatorView.Style.gray
    //        activityIndicator.center = self.view.center
    //        activityIndicator.hidesWhenStopped = true
    //        activityIndicator.startAnimating()
    //
    //        self.view.addSubview(activityIndicator)
    //
    //        let searchRequest = MKLocalSearch.Request()
    //        searchRequest.naturalLanguageQuery = "Hospital"
    //
    //        let activeSearch = MKLocalSearch(request: searchRequest)
    //
    //        activeSearch.start { ( response, error) in
    //            activityIndicator.stopAnimating()
    //            UIApplication.shared.endIgnoringInteractionEvents()
    //
    //
    //            if response == nil{
    //                print("Error")
    //            } else {
    //                let annotations = self.mapView.annotations
    //                self.mapView.removeAnnotations(annotations)
    //
    //                let latitude = response?.boundingRegion.center.latitude
    //                let longitude = response?.boundingRegion.center.longitude
    //
    //                let annotation = MKPointAnnotation()
    //                annotation.title = "Hospital"
    //                annotation.coordinate = CLLocationCoordinate2D(latitude: latitude!, longitude: longitude!)
    //    self.mapView.addAnnotation(annotation)
    //
    //            }
    //        }
    //




      private func addAnnotations(){
        let hospitalLaPaz = MKPointAnnotation()
        hospitalLaPaz.title = "Hospital La Paz"
        hospitalLaPaz.coordinate = CLLocationCoordinate2D(latitude: 19.058851, longitude: -98.226132)

        let hospitalSalutem = MKPointAnnotation()
        hospitalSalutem.title = "Hospital Salutem"
        hospitalSalutem.coordinate = CLLocationCoordinate2D(latitude: 19.058962, longitude: -98.230976)

        let hospitalPuebla = MKPointAnnotation()
        hospitalPuebla.title = "Hospital Puebla"
        hospitalPuebla.coordinate = CLLocationCoordinate2D(latitude: 19.030592, longitude: -98.229141)

        let hospitalAngeles = MKPointAnnotation()
        hospitalAngeles.title = "Hospital Ángeles-Puebla"
        hospitalAngeles.coordinate = CLLocationCoordinate2D(latitude: 19.021676, longitude: -98.235278)

        let hospitalDelNiñoPoblano = MKPointAnnotation()
        hospitalDelNiñoPoblano.title = "Hospital del Niño Poblano"
        hospitalDelNiñoPoblano.coordinate = CLLocationCoordinate2D(latitude: 19.034798, longitude: -98.244053)

        let hospitalBUAP = MKPointAnnotation()
        hospitalBUAP.title = "Hospital Universitario de Puebla"
        hospitalBUAP.coordinate = CLLocationCoordinate2D(latitude: 19.039964, longitude: -98.213331)

        let hospitalAngelopolitano = MKPointAnnotation()
        hospitalAngelopolitano.title = "Hospital Angelopolitano"
        hospitalAngelopolitano.coordinate = CLLocationCoordinate2D(latitude: 98.213331, longitude: -98.215445)

        let hospitalUPAEP = MKPointAnnotation()
        hospitalUPAEP.title = "Hospital UPAEP"
        hospitalUPAEP.coordinate = CLLocationCoordinate2D(latitude: 19.045732, longitude: -19.045732)

        let hospitalBeneficenciaEspañola = MKPointAnnotation()
        hospitalBeneficenciaEspañola.title = "Beneficencia Española"
        hospitalBeneficenciaEspañola.coordinate = CLLocationCoordinate2D(latitude: 19.055711, longitude: -98.209555)

        let hospitalBetania = MKPointAnnotation()
        hospitalBetania.title = "Hospital Betania"
        hospitalBetania.coordinate = CLLocationCoordinate2D(latitude: 19.034998, longitude: -98.188137)

        let hospitalVilaseca = MKPointAnnotation()
        hospitalVilaseca.title = "Hospital A. Vilaseca Esparza C."
        hospitalVilaseca.coordinate = CLLocationCoordinate2D(latitude: 19.047538, longitude: -98.187644)

        let hospitalGeneralIMSS = MKPointAnnotation()
        hospitalGeneralIMSS.title = "IMSS San José"
        hospitalGeneralIMSS.coordinate = CLLocationCoordinate2D(latitude: 19.050631, longitude: -98.192300)

        let hospitalGeneralZonaNorte = MKPointAnnotation()
        hospitalGeneralZonaNorte.title = "Hospital General Zona Norte"
        hospitalGeneralZonaNorte.coordinate = CLLocationCoordinate2D(latitude: 19.079432, longitude: -98.184495)

        let hospitalGeneralCholula = MKPointAnnotation()
        hospitalGeneralCholula.title = "Hospital General Cholula"
        hospitalGeneralCholula.coordinate = CLLocationCoordinate2D(latitude: 19.017239, longitude: -98.266399)

        let hospitalGeneralZonaSur = MKPointAnnotation()
        hospitalGeneralZonaSur.title = "Hospital General Del Sur"
        hospitalGeneralZonaSur.coordinate = CLLocationCoordinate2D(latitude: 18.986133, longitude: -98.242405)

        let hospitalRegionalISSSTE = MKPointAnnotation()
        hospitalRegionalISSSTE.title = "Hospital Regional ISSSTE"
        hospitalRegionalISSSTE.coordinate = CLLocationCoordinate2D(latitude: 19.020526, longitude: -98.197853)

        let hospitalGeneralZona20IMSS = MKPointAnnotation()
        hospitalGeneralZona20IMSS.title = "Hospital General IMSS Zona 20 La Margarita"
        hospitalGeneralZona20IMSS.coordinate = CLLocationCoordinate2D(latitude: 19.008275, longitude: -98.182857)

        mapView.addAnnotation(hospitalLaPaz)
        mapView.addAnnotation(hospitalSalutem)
        mapView.addAnnotation(hospitalPuebla)
        mapView.addAnnotation(hospitalAngeles)
        mapView.addAnnotation(hospitalDelNiñoPoblano)
        mapView.addAnnotation(hospitalBUAP)
        mapView.addAnnotation(hospitalAngelopolitano)
        mapView.addAnnotation(hospitalUPAEP)
        mapView.addAnnotation(hospitalBeneficenciaEspañola)
        mapView.addAnnotation(hospitalBetania)
        mapView.addAnnotation(hospitalGeneralIMSS)
        mapView.addAnnotation(hospitalGeneralZonaNorte)
        mapView.addAnnotation(hospitalGeneralCholula)
        mapView.addAnnotation(hospitalGeneralZonaSur)
        mapView.addAnnotation(hospitalRegionalISSSTE)
        mapView.addAnnotation(hospitalGeneralZona20IMSS)
    }
}

extension MapScreen: CLLocationManagerDelegate {

    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        checkLocationAuthorization()
       addAnnotations()
    }
}

extension MapScreen: MKMapViewDelegate {
    func mapView(_ mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
        let center = getCenterLocation(for: mapView)

        guard let previousLocation = self.previousLocation else { return }

        guard center.distance(from: previousLocation) > 50 else { return }
        self.previousLocation = center

        geoCoder.cancelGeocode()

        geoCoder.reverseGeocodeLocation(center) { [weak self] (placemarks, error) in
            guard let self = self else { return }

            if let _ = error {
                //TODO: Show alert informing the user
                return
            }

            guard let placemark = placemarks?.first else {
                //TODO: Show alert informing the user
                return
            }

            let streetNumber = placemark.subThoroughfare ?? ""
            let streetName = placemark.thoroughfare ?? ""

            DispatchQueue.main.async {
                self.addressLabel.text = "\(streetNumber) \(streetName)"
            }
        }
    }


    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
        let renderer = MKPolylineRenderer(overlay: overlay as! MKPolyline)
        renderer.strokeColor = .blue

        return renderer
    }
}

最佳答案

let request = MKLocalSearchRequest()
request.naturalLanguageQuery = "Hospital"
request.region = mapView.region

let search = MKLocalSearch(request: request)
search.startWithCompletionHandler { response, error in
    guard let response = response else {
        print("There was an error searching for: \(request.naturalLanguageQuery) error: \(error)")
        return
    }

    for mapItem in response.mapItems {
        // Display the received items
        let latitude = mapItem.placemark.location.coordinate.latitude
        let longitude = mapItem.placemark.location.coordinate.longitude

        let hospital = MKPointAnnotation()
        hospital.title = mapItem.name! //Only do `!` if you are sure that it isn't nil
        hospital.coordinate = CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
        mapView.addAnnotation(hospital)
    }
}

既然你有了这些坐标，你就可以创建任何你需要的了。

您所做的是使用边界框(您找到的所有医院的区域)作为位置，它提供的信息不正确。

这种方式遍历在响应中找到的每个项目，并从它们的类 MKMapItem 中获取它们的位置和您可能需要的任何其他信息。

关于ios - 如何使用 MapKit 显示该地区多家医院的注释？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54273789/