在Swift中查找纬度和经度的城市名称和国家

时间:2017-05-17 17:22:21

标签: ios swift location core-location latitude-longitude

我正在使用Swift3中的应用程序 我有信问题,我找不到答案。

我如何根据纬度和经度知道城市名称和国家/地区的短名称?

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)
    }
}

11 个答案:

答案 0 :(得分:19)

您可以使用CLGeocoder reverseGeocodeLocation方法获取CLPlacemark并获取countrylocality属性信息。请注意,它是一个异步方法,因此在获取该信息时需要向方法添加完成处理程序:

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

func fetchCityAndCountry(from location: CLLocation, completion: @escaping (_ city: String?, _ country:  String?, _ error: Error?) -> ()) {
    CLGeocoder().reverseGeocodeLocation(location) { placemarks, error in
        completion(placemarks?.first?.locality,
                   placemarks?.first?.country,
                   error)
    }
}

用法

let location = CLLocation(latitude: -22.963451, longitude: -43.198242)

fetchCityAndCountry(from: location) { city, country, error in
    guard let city = city, let country = country, error == nil else { return }
    print(city + ", " + country)  // Rio de Janeiro, Brazil
}

答案 1 :(得分:16)

我建议将Google Maps API与您的项目集成。如果您这样做,可以使用Google提供的Reverse Geocoding来完成您的任务。

此外,谷歌有Google Maps SDK用于IOS开发,这也值得考虑。

UPD:您可以在不将地图集成到项目中的情况下执行此操作。基于this答案,您可以使用对Google API的http请求来实现这一目标。请求:

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

会返回JSON个对象,其中包含有关所请求地点的信息,包括国家和城市名称。

顺便说一句,我强烈建议您使用Alamofire在Swift中发出http请求。

答案 2 :(得分:8)

您需要的是反向地理编码。正如您已经在顶部声明了一些属性。您需要添加 CLGeocoder &的 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?

创建一个可以启动位置服务的功能

func startLocationManager() {
    // always good habit to check if locationServicesEnabled
    if CLLocationManager.locationServicesEnabled() {
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.startUpdatingLocation()
    }
}
完成位置地理编码后,

还会创建另一个停止

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

在视图didLoad中或从您想要启动位置管理器的任何地方添加先检查

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()

}

实现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()
}

实现位置管理器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函数

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
    }

}

您必须cmd +点击CLPlacemark以查看您可以访问的所有属性,例如街道名称称为通道&amp;该号码被称为 subThoroughfare 继续阅读文档以获取更多信息

注意:您必须检查位置错误还有地理编码器错误,我在这里没有实现,但您必须处理这些错误以及检查错误代码的最佳位置,其他一切都是苹果文档

更新:检查paresPlacemarks函数,其中我添加的isoCountryCode等于国家/地区shortName在您已使用的位置服务时,无需向Google API和Alamofire添加额外的网络调用

答案 3 :(得分:5)

以下是Swift 4代码:

  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)
}

答案 4 :(得分:3)

您可以使用CoreLocation中的CLGeocoder。从Apple文档(强调我的):

  

用于在地理坐标和地名之间进行转换的单次拍摄对象。

     

CLGeocoder类提供用于在坐标(指定为纬度和经度)与该坐标的用户友好表示之间进行转换的服务。用户友好的坐标表示通常包含与给定位置对应的街道,城市,州和国家/地区信息...

此服务与MapKit无关,因此,您根本不需要在应用中使用/显示地图。

答案 5 :(得分:1)

1。导入CoreLocation 2。在您的课程中插入CLLocationManagerDelegate 3。执行下面描述的委托方法...希望对您有帮助     您可以按照以下步骤找到城市名称和国家/地区...这是我的代码

    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! + " "
                        }

                    }
                }
        })

    }

}

答案 6 :(得分:1)

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 ?? ""
    }
}

答案 7 :(得分:0)

我也有同样的问题。你可以使用这段代码。

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))")



})
}

希望这能解决您的问题。

答案 8 :(得分:0)

此方法将为您提供当前位置,城市名称,国家/地区名称等。

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)
    }
}

答案 9 :(得分:0)

在快速的4.1 Xcode 9.4.1中查看我的答案。您甚至可以获取村庄名称的详细信息。 Get location name from Latitude & Longitude in iOS

答案 10 :(得分:0)

将此扩展名添加到您的swift文件中。

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对象上调用它。

例如:

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