Reverse geocoding in Swift 4
CLGeocoder methods are asynchronous. What you would need a completion handler:
import UIKit
import CoreLocation
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true
func geocode(latitude: Double, longitude: Double, completion: @escaping (_ placemark: [CLPlacemark]?, _ error: Error?) -> Void) {
CLGeocoder().reverseGeocodeLocation(CLLocation(latitude: latitude, longitude: longitude)) { placemark, error in
guard let placemark = placemark, error == nil else {
completion(nil, error)
return
}
completion(placemark, nil)
}
}
or simply:
func geocode(latitude: Double, longitude: Double, completion: @escaping (_ placemark: [CLPlacemark]?, _ error: Error?) -> Void) {
CLGeocoder().reverseGeocodeLocation(CLLocation(latitude: latitude, longitude: longitude), completionHandler: completion)
}
or extending CLLocation:
extension CLLocation {
func geocode(completion: @escaping (_ placemark: [CLPlacemark]?, _ error: Error?) -> Void) {
CLGeocoder().reverseGeocodeLocation(self, completionHandler: completion)
}
}
To format your placemark as a mailing address you can use Contacts framework CNPostalAddressFormatter
:
import Contacts
extension Formatter {
static let mailingAddress: CNPostalAddressFormatter = {
let formatter = CNPostalAddressFormatter()
formatter.style = .mailingAddress
return formatter
}()
}
extension CLPlacemark {
var mailingAddress: String? {
postalAddress?.mailingAddress
}
}
extension CNPostalAddress {
var mailingAddress: String {
Formatter.mailingAddress.string(from: self)
}
}
placemark
Contains an array of CLPlacemark objects. For most geocoding requests, this array should contain only one entry. However, forward-geocoding requests may return multiple placemark objects in situations where the specified address could not be resolved to a single location. If the request was canceled or there was an error in obtaining the placemark information, this parameter is nil.
For more information about the CLPlacemark properties you can check this CLPlacemark
Usage:
let location = CLLocation(latitude: -22.963451, longitude: -43.198242)
location.geocode { placemark, error in
if let error = error as? CLError {
print("CLError:", error)
return
} else if let placemark = placemark?.first {
// you should always update your UI in the main thread
DispatchQueue.main.async {
// update UI here
print("name:", placemark.name ?? "unknown")
print("address1:", placemark.thoroughfare ?? "unknown")
print("address2:", placemark.subThoroughfare ?? "unknown")
print("neighborhood:", placemark.subLocality ?? "unknown")
print("city:", placemark.locality ?? "unknown")
print("state:", placemark.administrativeArea ?? "unknown")
print("subAdministrativeArea:", placemark.subAdministrativeArea ?? "unknown")
print("zip code:", placemark.postalCode ?? "unknown")
print("country:", placemark.country ?? "unknown", terminator: "\n\n")
print("isoCountryCode:", placemark.isoCountryCode ?? "unknown")
print("region identifier:", placemark.region?.identifier ?? "unknown")
print("timezone:", placemark.timeZone ?? "unknown", terminator:"\n\n")
// Mailind Address
print(placemark.mailingAddress ?? "unknown")
}
}
}
This will print
name: Morro da Saudade
address1: Rua Casuarina
address2: 597
neighborhood: Lagoa
city: Rio de Janeiro
state: RJ
subAdministrativeArea: unknown
zip code: 22011-040
country: Brazil
isoCountryCode: BR
region identifier: <-22.96345100,-43.19824200> radius 141.83
timezone: America/Sao_Paulo (current)
Rua Casuarina, 597
Lagoa
Rio de Janeiro RJ
22011-040
Brazil