xcode - usage - Cómo encontrar su ubicación actual con CoreLocation

location when in use usage description

Question

Necesito encontrar mi ubicación actual con CoreLocation , probé varios métodos pero hasta ahora mi CLLocationManager solo ha devuelto 0''s .. ( 0.000.00.000 ).

Aquí está mi código ( actualizado para funcionar ):

Importaciones :

#import <CoreLocation/CoreLocation.h>

Declarado :

IBOutlet CLLocationManager *locationManager;
IBOutlet UILabel *latLabel;
IBOutlet UILabel *longLabel;

Funciones :

- (void)getLocation { //Called when needed
latLabel.text = [NSString stringWithFormat:@"%f", locationManager.location.coordinate.latitude];
longLabel.text = [NSString stringWithFormat:@"%f", locationManager.location.coordinate.longitude];
}
- (void)viewDidLoad {
locationManager = [[CLLocationManager alloc] init];
locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; // 100 m
[locationManager startUpdatingLocation];
}

Answer 1

Aquí puede mostrar la ubicación actual con detalles de anotación

en ViewController.h

#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
//My
#import <MapKit/MapKit.h>
#import <MessageUI/MFMailComposeViewController.h>
@interface ViewController : UIViewController<CLLocationManagerDelegate,MKMapViewDelegate,MFMailComposeViewControllerDelegate>
{
IBOutlet UILabel *lblLatitiude;
IBOutlet UILabel *lblLongitude;
IBOutlet UILabel *lblAdress;
}
//My
@property (nonatomic, strong) IBOutlet MKMapView *mapView;
-(IBAction)getMyLocation:(id)sender;
@end

en ViewController.m

#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController{
CLLocationManager *locationManager;
CLGeocoder *geocoder;
CLPlacemark *placemark;
}
@synthesize mapView;
- (void)viewDidLoad
{
[super viewDidLoad];
locationManager = [[CLLocationManager alloc] init];
geocoder = [[CLGeocoder alloc] init];
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSMutableDictionary *defaultsDictionary = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"[email protected]", @"fromEmail",
@"[email protected]", @"toEmail",
@"smtp.gmail.com", @"relayHost",
@"[email protected]", @"login",
@"mobile@123", @"pass",
[NSNumber numberWithBool:YES], @"requiresAuth",
[NSNumber numberWithBool:YES], @"wantsSecure", nil];
[userDefaults registerDefaults:defaultsDictionary];
self.mapView.delegate=self;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Custom Methods
-(IBAction)getMyLocation:(id)sender{
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
}
#pragma mark - CLLocationManagerDelegate
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(@"didFailWithError: %@", error);
UIAlertView *errorAlert = [[UIAlertView alloc]
initWithTitle:@"Error" message:@"Failed to Get Your Location" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[errorAlert show];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSLog(@"didUpdateToLocation: %@", newLocation);
CLLocation *currentLocation = newLocation;
if (currentLocation != nil) {
lblLongitude.text = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.longitude];
lblLatitiude.text = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.latitude];
}
// Stop Location Manager
[locationManager stopUpdatingLocation];
// Reverse Geocoding
NSLog(@"Resolving the Address");
[geocoder reverseGeocodeLocation:currentLocation completionHandler:^(NSArray *placemarks, NSError *error) {
NSLog(@"Found placemarks: %@, error: %@", placemarks, error);
if (error == nil && [placemarks count] > 0) {
placemark = [placemarks lastObject];
lblAdress.text = [NSString stringWithFormat:@"%@ %@/n%@ %@/n%@/n%@",
placemark.subThoroughfare, placemark.thoroughfare,
placemark.postalCode, placemark.locality,
placemark.administrativeArea,
placemark.country];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(currentLocation.coordinate, 800, 800);
[self.mapView setRegion:[self.mapView regionThatFits:region] animated:YES];
// Add an annotation
MKPointAnnotation *point = [[MKPointAnnotation alloc] init];
point.coordinate = currentLocation.coordinate;
point.title = @"Where am I?";
point.subtitle = [NSString stringWithFormat:@"%@ %@/n%@ %@/n%@/n%@",
placemark.subThoroughfare, placemark.thoroughfare,
placemark.postalCode, placemark.locality,
placemark.administrativeArea,
placemark.country];
[self.mapView addAnnotation:point];
} else {
NSLog(@"%@", error.debugDescription);
}
} ];
}
//My
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
MKAnnotationView *annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"loc"];
annotationView.canShowCallout = YES;
annotationView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
return annotationView;
}
- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
[self getSignScreenShot];
MFMailComposeViewController* controller = [[MFMailComposeViewController alloc] init];
controller.mailComposeDelegate = self;
[controller setSubject:@"My Subject"];
[controller setMessageBody:@"Hello there." isHTML:NO];
if (controller) [self presentModalViewController:controller animated:YES];
}
- (void)mailComposeController:(MFMailComposeViewController*)controller
didFinishWithResult:(MFMailComposeResult)result
error:(NSError*)error;
{
if (result == MFMailComposeResultSent) {
NSLog(@"It''s away!");
}
[self dismissModalViewControllerAnimated:YES];
}
//-----------------------------------------------------------------------------------
//This methos is to take screenshot of map
//-----------------------------------------------------------------------------------
-(UIImage *)getSignScreenShot
{
CGRect rect = CGRectMake(self.mapView.frame.origin.x,self.mapView.frame.origin.y-50,self.mapView.frame.size.width+60,self.mapView.frame.size.height+15);
UIGraphicsBeginImageContextWithOptions(self.mapView.frame.size, NO, 1.0);
[self.mapView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext();
CGImageRef imageRef = CGImageCreateWithImageInRect([screenshot CGImage], rect);
UIImage *newImage = [UIImage imageWithCGImage:imageRef];
return newImage;
}

Answer 2

Con CLLocationManager no es necesario obtener la información de ubicación inmediatamente. Es posible que el GPS y otros dispositivos que obtienen información de ubicación no se hayan inicializado. Pueden tomar un tiempo antes de que tengan información. En su lugar, debe crear un objeto delegado que responda a locationManager:didUpdateToLocation:fromLocation: y luego locationManager:didUpdateToLocation:fromLocation: como el delegado del administrador de ubicación.

ver here

Answer 3

Puede encontrar su ubicación usando CoreLocation esta manera:

importar CoreLocation :

#import <CoreLocation/CoreLocation.h>

Declarar CLLocationManager :

CLLocationManager *locationManager;

Inicialice el locationManager en viewDidLoad y cree una función que pueda return la ubicación actual como un NSString :

- (NSString *)deviceLocation {
return [NSString stringWithFormat:@"latitude: %f longitude: %f", locationManager.location.coordinate.latitude, locationManager.location.coordinate.longitude];
}
- (void)viewDidLoad
{
locationManager = [[CLLocationManager alloc] init];
locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; // 100 m
[locationManager startUpdatingLocation];
}

Y al llamar a la función deviceLocation devolverá la ubicación como se esperaba:

NSLog(@"%@", [self deviceLocation]);

Esto es solo un ejemplo. Inicializar CLLocationManager sin que el usuario esté listo no es una buena idea. Y, por supuesto, locationManager.location.coordinate se puede usar para obtener latitude y longitude a voluntad después de que CLLocationManager se haya inicializado.

No olvide agregar el CoreLocation.framework de CoreLocation.framework en la configuración de su proyecto en la pestaña Targets->Build Phases->Link Binary ( Targets->Build Phases->Link Binary ).