问题
How to get an address from coordinates using MapKit?
I have this code when long press on the map it gets the coordinates:
func didLongPressMap(sender: UILongPressGestureRecognizer) {
if sender.state == UIGestureRecognizerState.Began {
let touchPoint = sender.locationInView(self.mapView)
let touchCoordinate = self.mapView.convertPoint(touchPoint, toCoordinateFromView: self.mapView)
var annotation = MKPointAnnotation()
annotation.coordinate = touchCoordinate
annotation.title = "Your position"
self.mapView.addAnnotation(annotation) //drops the pin
println("lat: \(touchCoordinate.latitude)")
var num = (touchCoordinate.latitude as NSNumber).floatValue
var formatter = NSNumberFormatter()
formatter.maximumFractionDigits = 4
formatter.minimumFractionDigits = 4
var str = formatter.stringFromNumber(num)
println("long: \(touchCoordinate.longitude)")
var num1 = (touchCoordinate.longitude as NSNumber).floatValue
var formatter1 = NSNumberFormatter()
formatter1.maximumFractionDigits = 4
formatter1.minimumFractionDigits = 4
var str1 = formatter1.stringFromNumber(num1)
self.adressLoLa.text = "\(num),\(num1)"
}
}
and I want to print in annotation.title the complete address (street, city, zip, country).
回答1:
SWIFT 4.2 : EDIT
MapKit framework does provide a way to get address details from coordinates.
You need to use reverse geocoding of map kit. CLGeocoder class is used to get the location from address and address from the location (coordinates). The method reverseGeocodeLocation will returns the address details from coordinates.
This method accepts CLLocation as a parameter and returns CLPlacemark, which contains address dictionary.
So now above method will be updated as:
@objc func didLongPressMap(sender: UILongPressGestureRecognizer) {
if sender.state == UIGestureRecognizer.State.began {
let touchPoint = sender.location(in: mapView)
let touchCoordinate = mapView.convert(touchPoint, toCoordinateFrom: self.mapView)
let annotation = MKPointAnnotation()
annotation.coordinate = touchCoordinate
annotation.title = "Your position"
mapView.addAnnotation(annotation) //drops the pin
print("lat: \(touchCoordinate.latitude)")
let num = touchCoordinate.latitude as NSNumber
let formatter = NumberFormatter()
formatter.maximumFractionDigits = 4
formatter.minimumFractionDigits = 4
_ = formatter.string(from: num)
print("long: \(touchCoordinate.longitude)")
let num1 = touchCoordinate.longitude as NSNumber
let formatter1 = NumberFormatter()
formatter1.maximumFractionDigits = 4
formatter1.minimumFractionDigits = 4
_ = formatter1.string(from: num1)
self.adressLoLa.text = "\(num),\(num1)"
// Add below code to get address for touch coordinates.
let geoCoder = CLGeocoder()
let location = CLLocation(latitude: touchCoordinate.latitude, longitude: touchCoordinate.longitude)
geoCoder.reverseGeocodeLocation(location, completionHandler:
{
placemarks, error -> Void in
// Place details
guard let placeMark = placemarks?.first else { return }
// Location name
if let locationName = placeMark.location {
print(locationName)
}
// Street address
if let street = placeMark.thoroughfare {
print(street)
}
// City
if let city = placeMark.subAdministrativeArea {
print(city)
}
// Zip code
if let zip = placeMark.isoCountryCode {
print(zip)
}
// Country
if let country = placeMark.country {
print(country)
}
})
}
}
回答2:
For Swift 3: and Swift 4
First you need to set allowance to receive User's GPS in the info.plist.
Set: NSLocationWhenInUseUsageDescription with a random String.
And/or: NSLocationAlwaysUsageDescription with a random String.
Then I have set up a class to get the desired data like zip, town, country...:
import Foundation
import MapKit
typealias JSONDictionary = [String:Any]
class LocationServices {
let shared = LocationServices()
let locManager = CLLocationManager()
var currentLocation: CLLocation!
let authStatus = CLLocationManager.authorizationStatus()
let inUse = CLAuthorizationStatus.authorizedWhenInUse
let always = CLAuthorizationStatus.authorizedAlways
func getAdress(completion: @escaping (_ address: JSONDictionary?, _ error: Error?) -> ()) {
self.locManager.requestWhenInUseAuthorization()
if self.authStatus == inUse || self.authStatus == always {
self.currentLocation = locManager.location
let geoCoder = CLGeocoder()
geoCoder.reverseGeocodeLocation(self.currentLocation) { placemarks, error in
if let e = error {
completion(nil, e)
} else {
let placeArray = placemarks as? [CLPlacemark]
var placeMark: CLPlacemark!
placeMark = placeArray?[0]
guard let address = placeMark.addressDictionary as? JSONDictionary else {
return
}
completion(address, nil)
}
}
}
}
}
Called by:
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
LocationServices.shared.getAdress { address, error in
if let a = address, let city = a["City"] as? String {
//
}
}
}
}
Done
回答3:
Update:
import Foundation
import CoreLocation
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true
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 ?? ""
}
}
Old/Deprecated answer:
Thanks to @Kampai's answer, here's a Swift 3 compatible and safer way (no forcing !):
let geoCoder = CLGeocoder()
let location = CLLocation(latitude: touchCoordinate.latitude, longitude: touchCoordinate.longitude)
geoCoder.reverseGeocodeLocation(location, completionHandler: { placemarks, error in
guard let addressDict = placemarks?[0].addressDictionary else {
return
}
// Print each key-value pair in a new row
addressDict.forEach { print($0) }
// Print fully formatted address
if let formattedAddress = addressDict["FormattedAddressLines"] as? [String] {
print(formattedAddress.joined(separator: ", "))
}
// Access each element manually
if let locationName = addressDict["Name"] as? String {
print(locationName)
}
if let street = addressDict["Thoroughfare"] as? String {
print(street)
}
if let city = addressDict["City"] as? String {
print(city)
}
if let zip = addressDict["ZIP"] as? String {
print(zip)
}
if let country = addressDict["Country"] as? String {
print(country)
}
})
Don't forget NSLocationWhenInUseUsageDescription and NSLocationAlwaysUsageDescription keys in Swift 3
回答4:
Thanks to @Kampi for this. This is an updated Swift 2.0 (Xcode 7) Version:
func setUsersClosestCity()
{
let geoCoder = CLGeocoder()
let location = CLLocation(latitude: _point1.coordinate.latitude, longitude: _point1.coordinate.longitude)
geoCoder.reverseGeocodeLocation(location)
{
(placemarks, error) -> Void in
let placeArray = placemarks as [CLPlacemark]!
// Place details
var placeMark: CLPlacemark!
placeMark = placeArray?[0]
// Address dictionary
print(placeMark.addressDictionary)
// Location name
if let locationName = placeMark.addressDictionary?["Name"] as? NSString
{
print(locationName)
}
// Street address
if let street = placeMark.addressDictionary?["Thoroughfare"] as? NSString
{
print(street)
}
// City
if let city = placeMark.addressDictionary?["City"] as? NSString
{
print(city)
}
// Zip code
if let zip = placeMark.addressDictionary?["ZIP"] as? NSString
{
print(zip)
}
// Country
if let country = placeMark.addressDictionary?["Country"] as? NSString
{
print(country)
}
}
}
回答5:
Thanks @Kampai for his answer, I revised a bit so it works with Swift 1.2:
var geocoder = CLGeocoder()
var location = CLLocation(latitude: IC.coordinate!.latitude, longitude: IC.coordinate!.longitude)
geocoder.reverseGeocodeLocation(location) {
(placemarks, error) -> Void in
if let placemarks = placemarks as? [CLPlacemark] where placemarks.count > 0 {
var placemark = placemarks[0]
println(placemark.addressDictionary)
}
Result:
[SubLocality: Sydney, Street: 141 Harrington Street, State: NSW, SubThoroughfare: 141, CountryCode: AU, ZIP: 2000, Thoroughfare: Harrington Street, Name: 141 Harrington Street, Country: Australia, FormattedAddressLines: ( "141 Harrington Street", "The Rocks NSW 2000", Australia ), City: The Rocks]
回答6:
Swift 4.2 Keep it as simple as possible, look at the Apple doc and modify it as you need:
func retreiveCityName(lattitude: Double, longitude: Double, completionHandler: @escaping (String?) -> Void)
{
let geocoder = CLGeocoder()
geocoder.reverseGeocodeLocation(CLLocation(latitude: latitude, longitude: longitude), completionHandler:
{
placeMarks, error in
completionHandler(placeMarks?.first?.locality)
})
}
回答7:
Update Swift 4
addressDictionary was deprecated in iOS 11.0
let geoCoder = CLGeocoder()
let location = CLLocation(latitude: 37.769193, longitude: -122.426512)
geoCoder.reverseGeocodeLocation(location, completionHandler: { (placemarks, error) -> Void in
// Place details
var placeMark: CLPlacemark!
placeMark = placemarks?[0]
// Complete address as PostalAddress
print(placeMark.postalAddress as Any) // Import Contacts
// Location name
if let locationName = placeMark.name {
print(locationName)
}
// Street address
if let street = placeMark.thoroughfare {
print(street)
}
// Country
if let country = placeMark.country {
print(country)
}
})
More Data can be retrieved
name, thoroughfare, subThoroughfare, locality, subLocality, administrativeArea, subAdministrativeArea, postalcode, isoCountryCode, country, inlandWater, areaOfInterest
回答8:
In didUpdateToLocation method:
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:
(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
CLLocation *location = [locationManager location];
CLLocationCoordinate2D coordinate = [location coordinate];
latitude = [NSString stringWithFormat:@"%.12f", coordinate.latitude];
longitude = [NSString stringWithFormat:@"%.12f", coordinate.longitude];
CLLocation *location1 = [[CLLocation alloc]
initWithLatitude:latitude.floatValue
longitude:longitude.floatValue];
self.myGeocoder = [[CLGeocoder alloc] init];
[self.myGeocoder
reverseGeocodeLocation:location1
completionHandler:^(NSArray *placemarks, NSError *error) {
if (error == nil &&
[placemarks count] > 0){
placemark = [placemarks lastObject];
NSString* vendorLocation=[NSString stringWithFormat:@"%@ %@",
placemark.locality,
placemark.subLocality];
NSLog(@"%@",vendorLocation);
}
}];
}
回答9:
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))")
})
}
use this code this will resolve the issue.
来源：https://stackoverflow.com/questions/27735835/convert-coordinates-to-city-name