Objective C GeoLocations finder

GeoLocation

//Header
#import <Foundation/Foundation.h>
#import "CoreLocation/CoreLocation.h"

@interface GeoLocation : NSObject<CLLocationManagerDelegate,UIAlertViewDelegate>
{
    CLLocationManager *locationManager;
    double latitude;
    double longitude;
}
+ (id)sharedGeoLocationManager;
-(void)StartGpsGeoLocation;
-(void)StopGpsGeoLocation;
-(double)GetLatitude;
-(double)GetLongitude;
@end

//Implementation

#import "GeoLocation.h"

@implementation GeoLocation

+ (id)sharedGeoLocationManager {
    
    static SGGI_GeoLocation *sharedGeoLocationManager = nil;
    
    @synchronized(self) {//To safeguard threading issues
        
        if (sharedGeoLocationManager == nil)
            sharedGeoLocationManager = [[self alloc] init];
    }
    
    return sharedGeoLocationManager;
}

- (id)init {
    if (self = [super init]) {
     //   someProperty = [[NSString alloc] initWithString:@"Default Property Value"];
    }
    return self;
}

-(double)GetLatitude
{
    return latitude;
}

-(double)GetLongitude
{
    return longitude;
}

-(void)StartGpsGeoLocation
{
    locationManager=[[CLLocationManager alloc]init];
    
    [locationManager setDelegate:self];
    
    [locationManager setActivityType:CLActivityTypeFitness];//Pedestrian activity
    
    [locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
    
    [locationManager setDistanceFilter:kCLDistanceFilterNone];
    
    [locationManager startUpdatingLocation];
}

-(void)StopGpsGeoLocation
{
    [locationManager stopUpdatingLocation];
}

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
    
    latitude=newLocation.coordinate.latitude;
    
    longitude=newLocation.coordinate.longitude;
    
}

-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
    [manager stopUpdatingLocation];
    
    NSLog(@"error%@",error);
    
    switch([error code])
    {
        case kCLErrorNetwork: // general, network-related error
        {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Information" message:@"Please check your network connectivity or that you are not in airplane mode" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
            [alert show];
        }
            break;
        case kCLErrorDenied:{
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Information" message:@"Please enable the localization services to further continue to work on this app." delegate:self cancelButtonTitle:@"Quit app" otherButtonTitles:nil, nil];
            [alert show];
        }
            break;
        default:
        {
            NSLog(@"GPS ErrorCode:%d",[error code]);
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"GPS" message:@"Unknown network error." delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
            alert.tag=100;
         //   [alert show];
        }
            break;
    }
}
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if([[alertView buttonTitleAtIndex:buttonIndex] isEqualToString:@"Quit app"])
    {
        exit(0);
    }
}
@end