Obtener latitud/longitud desde la dirección

Question

¿Cómo puedo obtener la latitud y la longitud desde una dirección completa (calle, ciudad, etc.) introducida por el usuario, utilizando el iPhone SDK 3.x?

Answer 1

He aquí una versión actualizada, más compacto, versión del código de Unforgiven, que utiliza la última versión 3 del API:

- (CLLocationCoordinate2D) geoCodeUsingAddress:(NSString *)address 
{ 
    double latitude = 0, longitude = 0; 
    NSString *esc_addr = [address stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; 
    NSString *req = [NSString stringWithFormat:@"http://maps.google.com/maps/api/geocode/json?sensor=false&address=%@", esc_addr]; 
    NSString *result = [NSString stringWithContentsOfURL:[NSURL URLWithString:req] encoding:NSUTF8StringEncoding error:NULL]; 
    if (result) { 
     NSScanner *scanner = [NSScanner scannerWithString:result]; 
     if ([scanner scanUpToString:@"\"lat\" :" intoString:nil] && [scanner scanString:@"\"lat\" :" intoString:nil]) { 
      [scanner scanDouble:&latitude]; 
      if ([scanner scanUpToString:@"\"lng\" :" intoString:nil] && [scanner scanString:@"\"lng\" :" intoString:nil]) { 
       [scanner scanDouble:&longitude]; 
      } 
     } 
    } 
    CLLocationCoordinate2D center; 
    center.latitude = latitude; 
    center.longitude = longitude; 
    return center; 
} 

Se hace la suposición de que las coordenadas de "localización" son lo primero , p.ej antes de los de "viewport", porque solo toma las primeras coords que encuentra bajo las teclas "lng" y "lat". Siéntase libre de utilizar un escáner JSON adecuado (por ejemplo, SBJSON) si le preocupa esta técnica de escaneo simple que se utiliza aquí.

Answer 2

Puede utilizar la geocodificación de Google for this. Es tan simple como obtener datos a través de HTTP y analizarlos (puede devolver JSON KML, XML, CSV).

Answer 3

El siguiente método hace lo que usted solicitó. Debe insertar su clave de Google Maps para que esto funcione correctamente.

- (CLLocationCoordinate2D) geoCodeUsingAddress:(NSString *)address{ 

    int code = -1; 
    int accuracy = -1; 
    float latitude = 0.0f; 
    float longitude = 0.0f; 
    CLLocationCoordinate2D center; 

    // setup maps api key 
    NSString * MAPS_API_KEY = @"YOUR GOOGLE MAPS KEY HERE"; 

    NSString *escaped_address = [address stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding]; 
    // Contact Google and make a geocoding request 
    NSString *requestString = [NSString stringWithFormat:@"http://maps.google.com/maps/geo?q=%@&output=csv&oe=utf8&key=%@&sensor=false&gl=it", escaped_address, MAPS_API_KEY]; 
    NSURL *url = [NSURL URLWithString:requestString]; 

    NSString *result = [NSString stringWithContentsOfURL: url encoding: NSUTF8StringEncoding error:NULL]; 
     if(result){ 
      // we got a result from the server, now parse it 
      NSScanner *scanner = [NSScanner scannerWithString:result]; 
      [scanner scanInt:&code]; 
      if(code == 200){ 
       // everything went off smoothly 
       [scanner scanString:@"," intoString:nil]; 
       [scanner scanInt:&accuracy]; 

       //NSLog(@"Accuracy: %d", accuracy); 

       [scanner scanString:@"," intoString:nil]; 
       [scanner scanFloat:&latitude]; 
       [scanner scanString:@"," intoString:nil]; 
       [scanner scanFloat:&longitude]; 


       center.latitude = latitude; 
       center.longitude = longitude; 

       return center; 


      } 
      else{ 
       // the server answer was not the one we expected 
       UIAlertView *alert = [[[UIAlertView alloc] 
             initWithTitle: @"Warning" 
             message:@"Connection to Google Maps failed" 
             delegate:nil 
             cancelButtonTitle:nil 
             otherButtonTitles:@"OK", nil] autorelease]; 

       [alert show]; 

       center.latitude = 0.0f; 
       center.longitude = 0.0f; 

       return center; 


      } 

     } 
     else{ 
      // no result back from the server 
      UIAlertView *alert = [[[UIAlertView alloc] 
            initWithTitle: @"Warning" 
            message:@"Connection to Google Maps failed" 
            delegate:nil 
            cancelButtonTitle:nil 
            otherButtonTitles:@"OK", nil] autorelease]; 

      [alert show]; 

      center.latitude = 0.0f; 
      center.longitude = 0.0f; 

      return center; 
     } 

    } 

     center.latitude = 0.0f; 
     center.longitude = 0.0f; 

     return center; 

} 

Answer 4

También hay CoreGeoLocation, que completa la funcionalidad en un marco (Mac) o biblioteca estática (iPhone). Admite búsquedas a través de Google o Yahoo, si tiene preferencia por una sobre la otra.

http://github.com/thekarladam/CoreGeoLocation

Answer 5

Para la solución llave en Google mapa, como se describe por encima sin perdón, no hay que hacer que la aplicación gratuita? Según los términos de Google & condiciones: 9.1 Acceso gratuito y público a la implementación de su API de Maps. Los usuarios deben tener acceso a la implementación de API de Google Maps sin cargo.

Con el kit de mapas en sdk 3.0 esto se hace fácilmente usando el SDK. Vea los manuales de manzana o seguir: http://www.devworld.apple.com/iphone/program/sdk/maps.html

Answer 6

Aquí hay una solución similar para obtener la latitud y la longitud de Google. Nota: En este ejemplo se utiliza la biblioteca SBJson, que se puede encontrar en GitHub:

+ (CLLocationCoordinate2D) geoCodeUsingAddress: (NSString *) address 
{ 
    CLLocationCoordinate2D myLocation; 

// -- modified from the stackoverflow page - we use the SBJson parser instead of the string scanner -- 

     NSString  *esc_addr = [address stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding]; 
     NSString   *req = [NSString stringWithFormat: @"http://maps.google.com/maps/api/geocode/json?sensor=false&address=%@", esc_addr]; 
    NSDictionary *googleResponse = [[NSString stringWithContentsOfURL: [NSURL URLWithString: req] encoding: NSUTF8StringEncoding error: NULL] JSONValue]; 

    NSDictionary *resultsDict = [googleResponse valueForKey: @"results"]; // get the results dictionary 
    NSDictionary *geometryDict = [ resultsDict valueForKey: @"geometry"]; // geometry dictionary within the results dictionary 
    NSDictionary *locationDict = [ geometryDict valueForKey: @"location"]; // location dictionary within the geometry dictionary 

// -- you should be able to strip the latitude & longitude from google's location information (while understanding what the json parser returns) -- 

    DLog (@"-- returning latitude & longitude from google --"); 

    NSArray *latArray = [locationDict valueForKey: @"lat"]; NSString *latString = [latArray lastObject];  // (one element) array entries provided by the json parser 
    NSArray *lngArray = [locationDict valueForKey: @"lng"]; NSString *lngString = [lngArray lastObject];  // (one element) array entries provided by the json parser 

    myLocation.latitude = [latString doubleValue];  // the json parser uses NSArrays which don't support "doubleValue" 
    myLocation.longitude = [lngString doubleValue]; 

    return myLocation; 
} 

Answer 7

Actualizar versión, iOS usando JSON:

- (CLLocationCoordinate2D)getLocation:(NSString *)address { 

    CLLocationCoordinate2D center; 
    NSString *esc_addr = [address stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; 
    NSString *req = [NSString stringWithFormat:@"http://maps.google.com/maps/api/geocode/json?sensor=false&address=%@", esc_addr]; 
    NSData *responseData = [[NSData alloc] initWithContentsOfURL: 
         [NSURL URLWithString:req]]; NSError *error; 
    NSMutableDictionary *responseDictionary = [NSJSONSerialization 
               JSONObjectWithData:responseData 
               options:nil 
               error:&error]; 
    if(error) 
    { 
     NSLog(@"%@", [error localizedDescription]); 
     center.latitude = 0; 
     center.longitude = 0; 
     return center; 
    } 
    else { 
     NSArray *results = (NSArray *) responseDictionary[@"results"]; 
     NSDictionary *firstItem = (NSDictionary *) [results objectAtIndex:0]; 
     NSDictionary *geometry = (NSDictionary *) [firstItem objectForKey:@"geometry"]; 
     NSDictionary *location = (NSDictionary *) [geometry objectForKey:@"location"]; 
     NSNumber *lat = (NSNumber *) [location objectForKey:@"lat"]; 
     NSNumber *lng = (NSNumber *) [location objectForKey:@"lng"]; 

     center.latitude = [lat doubleValue]; 
     center.longitude = [lng doubleValue]; 
     return center; 
    } 
} 

Answer 8

- (void)viewDidLoad 
{ 
    app=(AppDelegate *)[[UIApplication sharedApplication] delegate]; 
    NSLog(@"%@", app.str_address); 


    NSLog(@"internet connect"); 

    NSString *Str_address=_txt_zipcode.text; 

    double latitude1 = 0, longitude1 = 0; 
    NSString *esc_addr = [ Str_address stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; 
    NSString *req = [NSString stringWithFormat:@"http://maps.google.com/maps/api/geocode/json?sensor=false&address=%@", esc_addr]; 
    NSString *result = [NSString stringWithContentsOfURL:[NSURL URLWithString:req] encoding:NSUTF8StringEncoding error:NULL]; 
    if (result) 
    { 
     NSScanner *scanner = [NSScanner scannerWithString:result]; 
     if ([scanner scanUpToString:@"\"lat\" :" intoString:nil] && [scanner scanString:@"\"lat\" :" intoString:nil]) 
     { 
      [scanner scanDouble:&latitude1]; 
      if ([scanner scanUpToString:@"\"lng\" :" intoString:nil] && [scanner scanString:@"\"lng\" :" intoString:nil]) 
      { 
       [scanner scanDouble:&longitude1]; 
      } 
     } 
    } 


    //in #.hfile 
    // CLLocationCoordinate2D lat; 
    // CLLocationCoordinate2D lon; 
    // float address_latitude; 
    // float address_longitude; 


    lat.latitude=latitude1; 
    lon.longitude=longitude1; 

    address_latitude=lat.latitude; 
    address_longitude=lon.longitude; 

} 

Answer 9

func geoCodeUsingAddress(address: NSString) -> CLLocationCoordinate2D { 
    var latitude: Double = 0 
    var longitude: Double = 0 
    let addressstr : NSString = "http://maps.google.com/maps/api/geocode/json?sensor=false&address=\(address)" as NSString 
    let urlStr = addressstr.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) 
    let searchURL: NSURL = NSURL(string: urlStr! as String)! 
    do { 
     let newdata = try Data(contentsOf: searchURL as URL) 
     if let responseDictionary = try JSONSerialization.jsonObject(with: newdata, options: []) as? NSDictionary { 
      print(responseDictionary) 
      let array = responseDictionary.object(forKey: "results") as! NSArray 
      let dic = array[0] as! NSDictionary 
      let locationDic = (dic.object(forKey: "geometry") as! NSDictionary).object(forKey: "location") as! NSDictionary 
      latitude = locationDic.object(forKey: "lat") as! Double 
      longitude = locationDic.object(forKey: "lng") as! Double 
     }} catch { 
    } 
    var center = CLLocationCoordinate2D() 
    center.latitude = latitude 
    center.longitude = longitude 
    return center 
}