如何在iOS中获取“仅当前位置”？

Question

I am using Core Location framework to getting location in iOS. I use, CLLocationManager *locationManager; and call [locationManager startUpdatingLocation];

Problem is I only need instantaneous location but startUpdatingLocation keep on giving me location. To stop this I can use [self.locationManager stopUpdatingLocation] , but this look like a way out or hack.

Is there any better way to just get current location in iOS?

Answer 1

in your .h file

#import <CoreLocation/CoreLocation.h>

 @interface LocationSearchViewController : UIViewController<UITextFieldDelegate,CLLocationManagerDelegate>
 {
 CLLocationManager *locationManager;
}

in your .m file

- (void)viewDidLoad
{
[super viewDidLoad];
locationManager = [[CLLocationManager alloc] init];


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);
[locationManager stopUpdatingLocation];   // when u got the lat and long it stop uoatde the location

CLLocation *currentLocation = newLocation;

if (currentLocation != nil) {

  NSString  *getcurrlong = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.longitude];
  NSSting *getcurrlat = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.latitude];



}
}

Answer 2

You can't think of location in those precise terms. You'll get back increasingly accurate locations from the location manager and it's up to you to decide when it's accurate enough. You have to weigh this against power usage and time. The location updates will never be completely accurate. The will never be returned immediately. The device has to power up hardware, then listen for GPS/WiFi/Cell signals and use all those to calculate location.

There's no way to ask for "my precise current location" and have it given to you immediately. Location is not a property like [NSDate date] . You can only ask for best-estimate location updates and they will only come to you in imprecise measurements, and never instantaneously (excepting cached location).

Answer 3

Check it

-(void)getCurrentLocation
{
    locationManager = [[CLLocationManager alloc] init];
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    locationManager.delegate = self;
    [locationManager startUpdatingLocation];
    startLocation = nil;
}

-(void)locationManager:(CLLocationManager *)manager
   didUpdateToLocation:(CLLocation *)newLocation
          fromLocation:(CLLocation *)oldLocation
{
    if (startLocation == nil)
    {
        startLocation = newLocation;
        [locationManager setDelegate:nil];
        locationManager = nil;

    }
}