Swiftの緯度と経度から都市名と国を見つける
私はSwift3でアプリケーションに取り組んでいますが、文字の問題があり、その答えが見つかりません。
緯度と経度に基づいて都市名と国の短縮名を知るにはどうすればよいですか？
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)
}
}
Google Maps API をプロジェクトに統合することをお勧めします。その場合、タスクは Reverse Geocoding Googleが提供するものを使用して達成できます。
さらに、Googleには Google Maps SDK for IOS開発もあります。これも検討する価値があります。
UPD：マップをプロジェクトに統合せずにこれを行うことができます。 this answerに基づいて、Google APIへのhttpリクエストを使用してそれを達成できます。へのリクエスト：
https://maps.googleapis.com/maps/api/geocode/json?latlng=40.714224,-73.961452&key=API_KEY
国や都市名など、要求された場所に関する情報を含むJSONオブジェクトを返します。
ところで、私は Alamofire を使用してSwiftでhttpリクエストを行うことを強くお勧めします。
CLGeocoder reverseGeocodeLocation メソッドを使用して CLPlacemark を取得し、その country および locality プロパティ情報を取得できます。これは非同期メソッドであるため、その情報を取得するときにメソッドに完了ハンドラーを追加する必要があることに注意してください。
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)
}
}
使用法
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
}
必要なものは逆ジオコーディングと呼ばれます。既に上部でいくつかのプロパティを宣言しているように。 CLGeocoder＆CLPlancemarkを追加する必要があります
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?
位置情報サービスを開始できる関数を作成します
func startLocationManager() {
// always good habit to check if locationServicesEnabled
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.startUpdatingLocation()
}
}
また、場所のジオコーディングが完了したら停止する別のものを作成します
func stopLocationManager() {
locationManager.stopUpdatingLocation()
locationManager.delegate = nil
}
ビューdidLoadで、またはロケーションマネージャを起動したい場所から、最初にチェックを追加
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()
}
ロケーションマネージャーの委任メソッドを実装しました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()
}
ロケーションマネージャーdidUpdateLocationsのデリゲートメソッドを実装する
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()
})
}
}
ParsePlacemarks関数を追加します
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
}
}
CLPlacemarkをcmdキーを押しながらクリックして、アクセスできるすべてのプロパティを表示する必要があります。たとえば、ストリート名はthoroughfareと呼ばれ、番号はsubThoroughfareと呼ばれます。詳しくは
注：ここで実装していないジオコーダーエラーとロケーションエラーをチェックする必要がありますが、エラーの世話をする必要があります。エラーコードをチェックするのに最適な場所です。
更新：国のshortNameに等しいisoCountryCodeを追加したparesPlacemarks関数を確認します既に位置情報サービスを使用している間に、Google APIとAlamofireに追加のネットワーク呼び出しを追加する必要はありません
これはSwift 4コード：です
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)
}
そのために、CoreLocationから CLGeocoder を使用できます。 From Apple documentation（私のものを強調）：
地理座標と地名を変換するためのシングルショットオブジェクト。
CLGeocoderクラスは、座標（緯度と経度で指定）とその座標のユーザーフレンドリーな表現との間の変換サービスを提供します。座標のユーザーフレンドリーな表現は通常、通り、city、州、およびcountry指定された場所に対応する情報...
このサービスは MapKit とは関係がないため、アプリでマップを使用/表示する必要はまったくありません。
1 CoreLocation 2をインポートします。クラス3にCLLocationManagerDelegateを挿入します。以下に説明するデリゲートメソッドを実行します...これらの手順に従うことで都市名と国を見つけるのに役立つことを願っています...ここに私のコードがあります
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! + " "
}
}
}
})
}
}
Swift 4.1 Xcode 9.4.1。村名の詳細も取得できます。 iOSのLatitude＆Longitudeから場所名を取得 =
このメソッドは、現在の場所、都市名、国名などを提供します。
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)
}
}
私も同じ問題を抱えていました。このコードを使用できます。
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))")
})
}
これで問題が解決することを願っています。