在Swift中從經緯度查找城市名稱和國家/地區

Question

我正在 Swift3 中處理應用程序，但遇到了字母問題，我找不到答案。

如何根據緯度和經度知道城市名稱和國家/地區簡稱？

import UIKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate{
    let locationManager = CLLocationManager()
    var latitude: Double = 0
    var longitude: Double = 0
    override func viewDidLoad() {
        super.viewDidLoad()
        // For use when the app is open & in the background
        locationManager.requestAlwaysAuthorization()
        // For use when the app is open
        //locationManager.requestWhenInUseAuthorization()
        locationManager.delegate = self
        locationManager.startUpdatingLocation()
        if CLLocationManager.locationServicesEnabled() {
            locationManager.delegate = self
            locationManager.desiredAccuracy = kCLLocationAccuracyBest
            locationManager.startUpdatingLocation()
        }
    }
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        if let location = locations.first {
            print(location.coordinate)
            latitude = location.coordinate.latitude
            longitude = location.coordinate.longitude
        }
    }
    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        if (status == CLAuthorizationStatus.denied){
            showLocationDisabledpopUp()
        }
    }
    func showLocationDisabledpopUp() {
        let alertController = UIAlertController(title: "Background Location Access  Disabled", message: "We need your location", preferredStyle: .alert)
        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
        alertController.addAction(cancelAction)
        let openAction = UIAlertAction(title: "Open Setting", style: .default) { (action) in
            if let url = URL(string: UIApplicationOpenSettingsURLString){
                UIApplication.shared.open(url, options: [:], completionHandler: nil)
            }
        }
        alertController.addAction(openAction)
        self.present(alertController, animated: true, completion: nil)
    }
}

Answer 1

您可以使用 CLGeocoder reverseGeocodeLocation方法來獲取CLPlacemark並獲取其國家和地區屬性信息。 請注意，它是一個異步方法，因此您需要在獲取該信息時向您的方法添加一個完成處理程序：

import UIKit
import MapKit
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true

extension CLLocation {
    func fetchCityAndCountry(completion: @escaping (_ city: String?, _ country:  String?, _ error: Error?) -> ()) {
        CLGeocoder().reverseGeocodeLocation(self) { completion($0?.first?.locality, $0?.first?.country, $1) }
    }
}

---

用法

let location = CLLocation(latitude: -22.963451, longitude: -43.198242)
location.fetchCityAndCountry { city, country, error in
    guard let city = city, let country = country, error == nil else { return }
    print(city + ", " + country)  // Rio de Janeiro, Brazil
}

---

編輯/更新：

iOS 11 或更高版本CLPlacemark具有postalAddress屬性。 您可以import Contacts框架並使用CNPostalAddressFormatter的string(from:)方法來獲取本地化的格式化地址。 您還可以擴展 CLPlacemark 並添加一些計算屬性以更好地描述其某些屬性：

import MapKit
import Contacts

extension CLPlacemark {
    /// street name, eg. Infinite Loop
    var streetName: String? { thoroughfare }
    /// // eg. 1
    var streetNumber: String? { subThoroughfare }
    /// city, eg. Cupertino
    var city: String? { locality }
    /// neighborhood, common name, eg. Mission District
    var neighborhood: String? { subLocality }
    /// state, eg. CA
    var state: String? { administrativeArea }
    /// county, eg. Santa Clara
    var county: String? { subAdministrativeArea }
    /// zip code, eg. 95014
    var zipCode: String? { postalCode }
    /// postal address formatted
    @available(iOS 11.0, *)
    var postalAddressFormatted: String? {
        guard let postalAddress = postalAddress else { return nil }
        return CNPostalAddressFormatter().string(from: postalAddress)
    }
}

---

extension CLLocation {
    func placemark(completion: @escaping (_ placemark: CLPlacemark?, _ error: Error?) -> ()) {
        CLGeocoder().reverseGeocodeLocation(self) { completion($0?.first, $1) }
    }
}

---

用法：

let location = CLLocation(latitude: 37.331676, longitude: -122.030189)
location.placemark { placemark, error in
    guard let placemark = placemark else { 
        print("Error:", error ?? "nil")
        return
    }
    print(placemark.postalAddressFormatted ?? "")
}

---

這將打印

1 無限循環
庫比蒂諾 CA 95014
美國

---

Answer 2

我建議將Google Maps API與您的項目集成。 如果這樣做，則可以使用 Google 提供的反向地理編碼來完成您的任務。

此外，谷歌還有用於IOS開發的谷歌地圖SDK ，也值得考慮。

UPD：您可以在不將地圖集成到您的項目中的情況下做到這一點。 基於此答案，您可以使用對 Google API 的 http 請求來實現。 請求：

https://maps.googleapis.com/maps/api/geocode/json?latlng=40.714224,-73.961452&key=API_KEY 

將返回帶有請求地點信息的JSON對象，包括國家和城市名稱。

順便說一句，我強烈建議使用Alamofire在 Swift 中發出 http 請求。

Answer 3

您需要的是反向地理編碼。 因為您已經在頂部聲明了一些屬性。 您需要添加CLGeocoder和CLPlancemark

let locationManager = CLLocationManager()
var location: CLLocation?

let geocoder = CLGeocoder()
var placemark: CLPlacemark?

// here I am declaring the iVars for city and country to access them later

var city: String?
var country: String?
var countryShortName: String?

創建一個功能，您可以在其中啟動位置服務

func startLocationManager() {
    // always good habit to check if locationServicesEnabled
    if CLLocationManager.locationServicesEnabled() {
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.startUpdatingLocation()
    }
}

完成位置地理編碼后，還可以創建另一個停止

func stopLocationManager() {
   locationManager.stopUpdatingLocation()
   locationManager.delegate = nil
}

在查看 didLoad 或從任何你想啟動位置管理器的地方先添加一個檢查

override func viewDidLoad() {
super.viewDidLoad()

    let authStatus = CLLocationManager.authorizationStatus()
    if authStatus == .notDetermined {
        locationManager.requestWhenInUseAuthorization()
    }

    if authStatus == .denied || authStatus == .restricted {
        // add any alert or inform the user to to enable location services 
    }

   // here you can call the start location function
   startLocationManager()

}

實現位置管理器的委托方法 didFailedWithError

func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
    // print the error to see what went wrong
    print("didFailwithError\(error)")
    // stop location manager if failed
    stopLocationManager()
}

實現位置管理器 didUpdateLocations 的委托方法

 func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    // if you need to get latest data you can get locations.last to check it if the device has been moved
    let latestLocation = locations.last!

    // here check if no need to continue just return still in the same place
    if latestLocation.horizontalAccuracy < 0 {
        return
    }
    // if it location is nil or it has been moved
    if location == nil || location!.horizontalAccuracy > lastLocation.horizontalAccuracy {

        location = lastLocation
        // stop location manager
        stopLocationManager()

        // Here is the place you want to start reverseGeocoding
        geocoder.reverseGeocodeLocation(lastLocation, completionHandler: { (placemarks, error) in
                // always good to check if no error
                // also we have to unwrap the placemark because it's optional
                // I have done all in a single if but you check them separately 
                if error == nil, let placemark = placemarks, !placemark.isEmpty {
                    self.placemark = placemark.last
                }
                // a new function where you start to parse placemarks to get the information you need
                self.parsePlacemarks()

           })
    }
}

添加 parsePlacemarks 函數

parsePlacemarks() {
   // here we check if location manager is not nil using a _ wild card 
   if let _ = location {
        // unwrap the placemark 
        if let placemark = placemark {
            // wow now you can get the city name. remember that apple refers to city name as locality not city
            // again we have to unwrap the locality remember optionalllls also some times there is no text so we check that it should not be empty
            if let city = placemark.locality, !city.isEmpty {
                // here you have the city name
                // assign city name to our iVar
                self.city = city
            }
            // the same story optionalllls also they are not empty
            if let country = placemark.country, !country.isEmpty {

                self.country = country
            }
            // get the country short name which is called isoCountryCode
            if let countryShortName = placemark.isoCountryCode, !countryShortName.isEmpty {

                self.countryShortName = countryShortName
            }

        }


    } else {
       // add some more check's if for some reason location manager is nil
    }

}

你必須在cmd +點擊CLPlacemark看到所有的屬性，你可以例如街道名稱訪問被稱為通道和數量被稱為subThoroughfare繼續閱讀文檔的詳細信息

注意：您必須檢查位置錯誤和地理編碼器錯誤，我沒有在此處實施，但您必須處理這些錯誤以及檢查錯誤代碼和其他所有內容的最佳位置是蘋果文檔

更新：檢查 paresPlacemarks 函數，其中我添加了 isoCountryCode，它等於 country shortName 在您已經使用位置服務時無需向 google API 和 Alamofire 添加額外的網絡調用

Answer 4

這是 Swift 4 代碼：

  var locationManager = CLLocationManager()

  override func viewDidLoad() {
    super.viewDidLoad()
    locationManager.delegate = self
    locationManager.requestWhenInUseAuthorization()
    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.startUpdatingLocation()
    locationManager.startMonitoringSignificantLocationChanges()
    // Here you can check whether you have allowed the permission or not.
    if CLLocationManager.locationServicesEnabled()
    {
        switch(CLLocationManager.authorizationStatus())
        {
        case .authorizedAlways, .authorizedWhenInUse:
            print("Authorize.")
            let latitude: CLLocationDegrees = (locationManager.location?.coordinate.latitude)!
            let longitude: CLLocationDegrees = (locationManager.location?.coordinate.longitude)!
            let location = CLLocation(latitude: latitude, longitude: longitude) //changed!!!
            CLGeocoder().reverseGeocodeLocation(location, completionHandler: {(placemarks, error) -> Void in
                if error != nil {
                    return
                }else if let country = placemarks?.first?.country,
                    let city = placemarks?.first?.locality {
                    print(country)
                    self.cityNameStr = city
                }
                else {
                }
            })
            break

        case .notDetermined:
            print("Not determined.")
            self.showAlertMessage(messageTitle: "Bolo Board", withMessage: "Location service is disabled!!")
            break

        case .restricted:
            print("Restricted.")
            self.showAlertMessage(messageTitle: "Bolo Board", withMessage: "Location service is disabled!!")
            break

        case .denied:
            print("Denied.")
        }
    }
}

func showAlertMessage(messageTitle: NSString, withMessage: NSString) ->Void  {
    let alertController = UIAlertController(title: messageTitle as String, message: withMessage as String, preferredStyle: .alert)
    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (action:UIAlertAction!) in

    }
    alertController.addAction(cancelAction)

    let OKAction = UIAlertAction(title: "Settings", style: .default) { (action:UIAlertAction!) in
        if let url = URL(string: "App-Prefs:root=Privacy&path=LOCATION/com.company.AppName") {
            if #available(iOS 10.0, *) {
                UIApplication.shared.open(url, options: [:], completionHandler: nil)
            } else {
                // Fallback on earlier versions
            }
        }
    }
    alertController.addAction(OKAction)
    self.present(alertController, animated: true, completion:nil)
}

Answer 5

CLGeocoder ，您可以使用來自 CoreLocation 的 CLGeocoder 。 來自 Apple 文檔（強調我的）：

用於在地理坐標和地名之間轉換的單次對象。

CLGeocoder類提供在坐標（指定為緯度和經度）和該坐標的用戶友好表示之間進行轉換的服務。 坐標的用戶友好表示通常包括與給定位置相對應的街道、城市、州和國家信息......

此服務與MapKit無關，因此根本不需要您在應用程序中使用/顯示地圖。

Answer 6

import Foundation
import CoreLocation

let location = CLLocation(latitude: 37.3321, longitude: -122.0318)
CLGeocoder().reverseGeocodeLocation(location) { placemarks, error in

    guard let placemark = placemarks?.first else {
        let errorString = error?.localizedDescription ?? "Unexpected Error"
        print("Unable to reverse geocode the given location. Error: \(errorString)")
        return
    }

    let reversedGeoLocation = ReversedGeoLocation(with: placemark)
    print(reversedGeoLocation.formattedAddress)
    // Apple Inc.,
    // 1 Infinite Loop,
    // Cupertino, CA 95014
    // United States
}

struct ReversedGeoLocation {
    let name: String            // eg. Apple Inc.
    let streetName: String      // eg. Infinite Loop
    let streetNumber: String    // eg. 1
    let city: String            // eg. Cupertino
    let state: String           // eg. CA
    let zipCode: String         // eg. 95014
    let country: String         // eg. United States
    let isoCountryCode: String  // eg. US

    var formattedAddress: String {
        return """
        \(name),
        \(streetNumber) \(streetName),
        \(city), \(state) \(zipCode)
        \(country)
        """
    }

    // Handle optionals as needed
    init(with placemark: CLPlacemark) {
        self.name           = placemark.name ?? ""
        self.streetName     = placemark.thoroughfare ?? ""
        self.streetNumber   = placemark.subThoroughfare ?? ""
        self.city           = placemark.locality ?? ""
        self.state          = placemark.administrativeArea ?? ""
        self.zipCode        = placemark.postalCode ?? ""
        self.country        = placemark.country ?? ""
        self.isoCountryCode = placemark.isoCountryCode ?? ""
    }
}

Answer 7

1 . 導入 CoreLocation 2 。 在你的類中插入 CLLocationManagerDelegate 3 。 執行下面描述的委托方法...希望它可以幫助您通過以下步驟找到城市名稱和國家...這是我的代碼

    import UIKit

    import CoreLocation 

    class MyViewController:UIViewController,CLLocationManagerDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()


        self.locationManager.delegate = self
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
        self.locationManager.requestWhenInUseAuthorization()
        self.locationManager.requestAlwaysAuthorization()
        self.locationManager.startUpdatingLocation()


}

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {



        if( CLLocationManager.authorizationStatus() == .authorizedWhenInUse ||
            CLLocationManager.authorizationStatus() ==  .authorizedAlways){

           if let currentLocation = locationManager.location
           {

           if NetworkFunctions.NetworkRechability()
           {

            getAddressFromLatLon(pdblLatitude: "\(Double((currentLocation.coordinate.latitude)))", withLongitude: "\(Double((currentLocation.coordinate.longitude)))")

            }

            }
        }



    }

    func getAddressFromLatLon(pdblLatitude: String, withLongitude pdblLongitude: String) {
        var center : CLLocationCoordinate2D = CLLocationCoordinate2D()
        let lat: Double = Double("\(pdblLatitude)")!

        let lon: Double = Double("\(pdblLongitude)")!

        let ceo: CLGeocoder = CLGeocoder()
        center.latitude = lat
        center.longitude = lon

        let loc: CLLocation = CLLocation(latitude:center.latitude, longitude: center.longitude)


        ceo.reverseGeocodeLocation(loc, completionHandler:
            {(placemarks, error) in
                if (error != nil)
                {
                }

                if placemarks != nil
                {

                    let pm = placemarks! as [CLPlacemark]

                    if pm.count > 0 {

                        let pm = placemarks![0]

                        print(pm.country ?? "")
                        print(pm.locality ?? "")
                       print(pm.subLocality ?? "")
                       print(pm.thoroughfare ?? "")
                        print(pm.postalCode ?? "")
                        print(pm.subThoroughfare ?? "")
                        var addressString : String = ""
                        if pm.subLocality != nil {
                            addressString = addressString + pm.subLocality! + ", "
                        }
                        if pm.thoroughfare != nil {
                            addressString = addressString + pm.thoroughfare! + ", "
                        }
                        if pm.locality != nil {
                            addressString = addressString + pm.locality! + ", "
                            if pm.country != nil {
                                addressString = addressString + pm.country! + ", "
                                //uuuuu
                                if(location_city != pm.locality!.trimmingCharacters(in: .whitespaces))
                                {
                                    location_city=pm.locality!.trimmingCharacters(in: .whitespaces)
                                      DispatchQueue.main.async{
                                    self.GetBeeWatherDetails(district: pm.locality!, country: pm.country!)
                                    }
                                }
                            }

                        }

                        if pm.postalCode != nil {
                            addressString = addressString + pm.postalCode! + " "
                        }

                    }
                }
        })

    }

}

Answer 8

在你的 swift 文件中添加這個擴展。

extension CLLocation {
func fetchAddress(completion: @escaping (_ address: String?, _ error: Error?) -> ()) {
    CLGeocoder().reverseGeocodeLocation(self) {
        let palcemark = $0?.first
        var address = ""
        if let subThoroughfare = palcemark?.subThoroughfare {
            address = address + subThoroughfare + ","
        }
        if let thoroughfare = palcemark?.thoroughfare {
            address = address + thoroughfare + ","
        }
        if let locality = palcemark?.locality {
            address = address + locality + ","
        }
        if let subLocality = palcemark?.subLocality {
            address = address + subLocality + ","
        }
        if let administrativeArea = palcemark?.administrativeArea {
            address = address + administrativeArea + ","
        }
        if let postalCode = palcemark?.postalCode {
            address = address + postalCode + ","
        }
        if let country = palcemark?.country {
            address = address + country + ","
        }
        if address.last == "," {
            address = String(address.dropLast())
        }
        completion(address,$1)
       // completion("\($0?.first?.subThoroughfare ?? ""), \($0?.first?.thoroughfare ?? ""), \($0?.first?.locality ?? ""), \($0?.first?.subLocality ?? ""), \($0?.first?.administrativeArea ?? ""), \($0?.first?.postalCode ?? ""), \($0?.first?.country ?? "")",$1)
    }
}

}

然后在任何 CLLocation 對象上調用它。

例如：

 (myLocation as? CLLocation)!.fetchAddress { (address, error) in
                        guard let address = address, error == nil else                              
{return }

Answer 9

我也有同樣的問題。您可以使用此代碼。

func placePicker(_ viewController: GMSPlacePickerViewController, didPick place: GMSPlace) {

    viewController.dismiss(animated: true, completion: nil)
    let geoCoder = CLGeocoder()
    let location = CLLocation(latitude: place.coordinate.latitude, longitude: place.coordinate.longitude)
    geoCoder.reverseGeocodeLocation(location, completionHandler: { (placemarks, error) -> Void in

        // Place details
        var placeMark: CLPlacemark!
        placeMark = placemarks?[0]

        // Address dictionary
        print(placeMark.addressDictionary as Any)
   // 

    print("Place name \(place.name)")
    print("Place address \(String(describing: place.formattedAddress))")
    print("Place attributions \(String(describing: place.attributions))")



})
}

希望這能解決您的問題。

Answer 10

此方法將為您提供當前位置、城市名稱、國家名稱等。

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    let location: CLLocation = locations.last!
    print("Location: \(location)")

    let geocoder = CLGeocoder()
    geocoder.reverseGeocodeLocation(location) { (placemarks, error) in
        // Process Response
        if let error = error {
            print("Unable to Reverse Geocode Location (\(error))")
        } else {
            if let placemarks = placemarks, let placemark = placemarks.first {
                self.city = placemark.locality!

                //self.country = placemark.country!
            }
        }
    }

    let camera = GMSCameraPosition.camera(withLatitude: location.coordinate.latitude,
                                          longitude: location.coordinate.longitude,
                                          zoom: zoomLevel)

     self.locationv = CLLocation(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)

    if myView.isHidden {
        myView.isHidden = false
        myView.camera = camera
    } else {
        myView.animate(to: camera)
    }
}

Answer 11

在 swift 4.1 Xcode 9.4.1 中查看我的答案。 您甚至可以獲得村庄名稱的詳細信息。 從 iOS 中的緯度和經度獲取位置名稱