¿Cómo recupera el nombre de la ciudad actual del usuario?
Lo que tienes que hacer es configurar una CLLocationManagerque encuentre tus coordenadas actuales. Con las coordenadas actuales que necesita usar MKReverseGeoCoderpara encontrar su ubicación.
- (void)viewDidLoad
{
// this creates the CCLocationManager that will find your current location
CLLocationManager *locationManager = [[[CLLocationManager alloc] init] autorelease];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
[locationManager startUpdatingLocation];
}
// this delegate is called when the app successfully finds your current location
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
// this creates a MKReverseGeocoder to find a placemark using the found coordinates
MKReverseGeocoder *geoCoder = [[MKReverseGeocoder alloc] initWithCoordinate:newLocation.coordinate];
geoCoder.delegate = self;
[geoCoder start];
}
// this delegate method is called if an error occurs in locating your current location
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(@"locationManager:%@ didFailWithError:%@", manager, error);
}
// this delegate is called when the reverseGeocoder finds a placemark
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark
{
MKPlacemark * myPlacemark = placemark;
// with the placemark you can now retrieve the city name
NSString *city = [myPlacemark.addressDictionary objectForKey:(NSString*) kABPersonAddressCityKey];
}
// this delegate is called when the reversegeocoder fails to find a placemark
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error
{
NSLog(@"reverseGeocoder:%@ didFailWithError:%@", geocoder, error);
}
¡A partir de iOS 5 MKReverseGeoCoderestá obsoleto!
Así que quieres usarlo CLGeocodercon CLLocationManager, muy simple y funciona con block.
Ejemplo:
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation
{
[self.locationManager stopUpdatingLocation];
CLGeocoder * geoCoder = [[CLGeocoder alloc] init];
[geoCoder reverseGeocodeLocation:newLocation
completionHandler:^(NSArray *placemarks, NSError *error) {
for (CLPlacemark *placemark in placemarks) {
.... = [placemark locality];
}
}];
}
Editar: en lugar de un for inbucle, también puede hacer:
NSString *locString = placemarks.count ? [placemarks.firstObject locality] : @"Not Found";Esto está funcionando bien para mí:
CLGeocoder *geocoder = [[CLGeocoder alloc] init] ;
[geocoder reverseGeocodeLocation:self.locationManager.location
completionHandler:^(NSArray *placemarks, NSError *error) {
NSLog(@"reverseGeocodeLocation:completionHandler: Completion Handler called!");
if (error){
NSLog(@"Geocode failed with error: %@", error);
return;
}
CLPlacemark *placemark = [placemarks objectAtIndex:0];
NSLog(@"placemark.ISOcountryCode %@",placemark.ISOcountryCode);
NSLog(@"placemark.country %@",placemark.country);
NSLog(@"placemark.postalCode %@",placemark.postalCode);
NSLog(@"placemark.administrativeArea %@",placemark.administrativeArea);
NSLog(@"placemark.locality %@",placemark.locality);
NSLog(@"placemark.subLocality %@",placemark.subLocality);
NSLog(@"placemark.subThoroughfare %@",placemark.subThoroughfare);
}];
kCLErrorDomain error 8, ¿sabes por qué?
Si alguien está intentando pasar a CLGeocoder desde MKReverseGeocoder, entonces he escrito una publicación de blog que podría ser de ayuda http://jonathanfield.me/jons-blog/clgeocoder-example.html
Básicamente, un ejemplo sería, después de haber creado los objetos locationManager y CLGeocoder, simplemente agregue este código a su viewDidLoad () y luego cree algunas etiquetas o áreas de texto para mostrar los datos.
[super viewDidLoad];
locationManager.delegate = self;
[locationManager startUpdatingLocation];
locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
[self.CLGeocoder reverseGeocodeLocation: locationManager.location completionHandler:
^(NSArray *placemarks, NSError *error) {
CLPlacemark *placemark = [placemarks objectAtIndex:0];
isoCountryCode.text = placemark.ISOcountryCode;
country.text = placemark.country;
postalCode.text= placemark.postalCode;
adminArea.text=placemark.administrativeArea;
subAdminArea.text=placemark.subAdministrativeArea;
locality.text=placemark.locality;
subLocality.text=placemark.subLocality;
thoroughfare.text=placemark.thoroughfare;
subThoroughfare.text=placemark.subThoroughfare;
//region.text=placemark.region;
}];
nilenviará mensajes para nildar nilcomo resultado , así como el acceso a la propiedad a través de la notación de puntos a través de nil. Dicho esto, siempre se debe verificar si errorno es nil.
Si alguien lo necesita en Swift 3 , así es como lo hice:
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations.first!
let coordinateRegion = MKCoordinateRegionMakeWithDistance(location.coordinate, 500, 500)
self.location = location
self.locationManager?.stopUpdatingLocation()
// Drop a pin at user's Current Location
let myAnnotation: MKPointAnnotation = CustomPointAnnotation()
myAnnotation.coordinate = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)
myAnnotation.title = "Localização"
self.mapViewMK.addAnnotation(myAnnotation)
self.mapViewMK.setRegion(coordinateRegion, animated: true)
self.locationManager?.stopUpdatingLocation()
self.locationManager = nil
// Get user's current location name
let geocoder = CLGeocoder()
geocoder.reverseGeocodeLocation(self.location!) { (placemarksArray, error) in
if (placemarksArray?.count)! > 0 {
let placemark = placemarksArray?.first
let number = placemark!.subThoroughfare
let bairro = placemark!.subLocality
let street = placemark!.thoroughfare
self.addressLabel.text = "\(street!), \(number!) - \(bairro!)"
}
}
}
Después de configurar CLLocationManager, obtendría la actualización de la ubicación como un par de latitud / longitud. Luego, podría usar CLGeocoder para convertir las coordenadas en un nombre de lugar fácil de usar.
Aquí está el código de muestra en Swift 4 .
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if let lastLocation = locations.last {
let geocoder = CLGeocoder()
geocoder.reverseGeocodeLocation(lastLocation) { [weak self] (placemarks, error) in
if error == nil {
if let firstLocation = placemarks?[0],
let cityName = firstLocation.locality { // get the city name
self?.locationManager.stopUpdatingLocation()
}
}
}
}
}
Debe obtener la ubicación actual del usuario y luego usar MKReverseGeocoder para reconocer la ciudad.
Hay un gran ejemplo en la Guía de programación de aplicaciones para iPhone , capítulo 8. Una vez que tenga la ubicación, inicialice el geocodificador, configure el delegado y lea el país en la marca de posición. Lea la documentación de MKReverseGeocodeDelegate y cree métodos:
reverseGeocoder: didFailWithError:
MKReverseGeocoder *geocoder = [[MKReverseGeocoder alloc] initWithCoordinate:newLocation.coordinate];
geocoder.delegate = self;
[geocoder start];
Puede utilizar este código para obtener la ciudad actual: -
extensión YourController: CLLocationManagerDelegate {func locationManager (administrador: CLLocationManager, ubicaciones didUpdateLocations: [CLLocation]) {
CLGeocoder().reverseGeocodeLocation(manager.location!, completionHandler: {(placemarks, error)->Void in
if (error != nil)
{
manager.stopUpdatingLocation()
return
}
else
{
if placemarks!.count > 0
{
let placeMarksArrray: NSArray = placemarks!
let pm = placeMarksArrray[0] as! CLPlacemark
self.displayLocationInfo(pm)
manager.stopUpdatingLocation()
} else
{
print("Problem with the data received from geocoder")
}
}
})
}
func displayLocationInfo(placemark: CLPlacemark!) {
if (placemark != nil) {
//stop updating location to save battery life
locationLocation.stopUpdatingLocation()
var tempString : String = ""
if(placemark.locality != nil){
tempString = tempString + placemark.locality! + " "
print(placemark.locality)
}
if(placemark.postalCode != nil){
tempString = tempString + placemark.postalCode! + " "
print(placemark.postalCode)
}
if(placemark.administrativeArea != nil){
tempString = tempString + placemark.administrativeArea! + " "
print(placemark.administrativeArea)
}
if(placemark.country != nil){
tempString = tempString + placemark.country! + " "
}
let dictForaddress = placemark.addressDictionary as! NSDictionary
if let city = dictForaddress["City"] {
print(city)
}
strLocation = tempString
}
}// place the function code below in desire location in program.
// [self getCurrentLocation];
-(void)getCurrentLocation
{
CLGeocoder *geocoder = [[CLGeocoder alloc] init] ;
[geocoder reverseGeocodeLocation:self->locationManager.location
completionHandler:^(NSArray *placemarks, NSError *error) {
NSLog(@"reverseGeocodeLocation:completionHandler: Completion Handler called!");
if (error){
NSLog(@"Geocode failed with error: %@", error);
return;
}
CLPlacemark *placemark = [placemarks objectAtIndex:0];
NSLog(@"placemark.ISOcountryCode %@",placemark.ISOcountryCode);
NSLog(@"placemark.country %@",placemark.country);
NSLog(@"placemark.locality %@",placemark.locality );
NSLog(@"placemark.postalCode %@",placemark.postalCode);
NSLog(@"placemark.administrativeArea %@",placemark.administrativeArea);
NSLog(@"placemark.locality %@",placemark.locality);
NSLog(@"placemark.subLocality %@",placemark.subLocality);
NSLog(@"placemark.subThoroughfare %@",placemark.subThoroughfare);
}];
}Aquí está mi pequeña clase Swift que me ayuda a obtener información geocodificada inversa sobre la ubicación actual. No se olvide del NSLocationWhenInUseUsageDescriptioncampo de entrada Info.plist.
class CurrentPlacemarkUpdater: NSObject, CLLocationManagerDelegate {
private let locationManager = CLLocationManager()
private let geocoder = CLGeocoder()
private(set) var latestPlacemark: CLPlacemark?
var onLatestPlacemarkUpdate: (() -> ())?
var shouldStopOnUpdate: Bool = true
func start() {
locationManager.requestWhenInUseAuthorization()
locationManager.desiredAccuracy = kCLLocationAccuracyKilometer
locationManager.delegate = self
locationManager.startUpdatingLocation()
}
func stop() {
locationManager.stopUpdatingLocation()
}
fileprivate func updatePlacemark(for location: CLLocation) {
geocoder.reverseGeocodeLocation(location) { [weak self] placemarks, error in
if let placemark = placemarks?.first {
self?.latestPlacemark = placemark
self?.onLatestPlacemarkUpdate?()
if self?.shouldStopOnUpdate ?? false {
self?.stop()
}
}
}
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if let location = locations.last {
updatePlacemark(for: location)
}
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
print("CurrentPlacemarkUpdater: \(error)")
}
}Lea la documentación de MKReverseGeocoder : Apple proporciona la documentación, las guías y las aplicaciones de muestra por una razón.