I\'m working on application in Swift3 and I have letter problem i can\'t find the answer for it.
How can I know city name and country short names base on latitud
You can use CLGeocoder reverseGeocodeLocation method to fetch a CLPlacemark and get its country and locality properties info. Note that it is an asynchronous method so you will need to add a completion handler to your method when fetching that info:
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) }
}
}
Usage
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
}
edit/update:
iOS 11 or later CLPlacemark
has a postalAddress
property. You can import Contacts
framework and use CNPostalAddressFormatter
's string(from:)
method to get a localized formatted address. You can also extend CLPlacemark and add some computed properties to better describe some of its properties:
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) }
}
}
Usage:
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 ?? "")
}
This will print
1 Infinite Loop
Cupertino CA 95014
United States
What you need is called reverse geocoding. As you have already declared some properties at the top. You need to add the CLGeocoder & 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?
Create a function where you can start the location services
func startLocationManager() {
// always good habit to check if locationServicesEnabled
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.startUpdatingLocation()
}
}
also create another to stop once you're done with location geocoding
func stopLocationManager() {
locationManager.stopUpdatingLocation()
locationManager.delegate = nil
}
in view didLoad or from anywhere you want to start the location manager add a check first
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()
}
implement the delegate methods for location manager 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()
}
implement the delegate method for location manager didUpdateLocations
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()
})
}
}
Add the parsePlacemarks function
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
}
}
You have to cmd+click on CLPlacemark to see all the properties that you can access for example street name is called thoroughfare & the number is is called subThoroughfare continue reading the documentation for more information
Note: You have to check for locations error also geocoder error which I haven't implemented here but you have to take care of those errors and the best place to check error codes and everything else is apples documentation
Update: Check paresPlacemarks function where I added isoCountryCode which is equal to country shortName No need to add extra network calls to google API and Alamofire while your already using location services
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 ?? ""
}
}
Here is the Swift 4 code:
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)
}
I had also the same issue .You can use this code.
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))")
})
}
Hope this will resolve your problem.