Getting current location using iPhone programming

This article explains how to get the current location in iPhone programming. Import the CoreLocation API in the iPhone application and use the following code

// MyCLController.h

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>

@protocol MyCLControllerDelegate
@required
- (void)locationUpdate:(CLLocation *)location;
- (void)locationError:(NSError *)error;
@end

@interface MyCLController : NSObject <CLLocationManagerDelegate> {
   CLLocationManager *locationManager;
    id delegate;
}

@property (nonatomic, retain) CLLocationManager *locationManager; @property (nonatomic, assign) id delegate;

- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation;

- (void)locationManager:(CLLocationManager *)manager
didFailWithError:(NSError *)error;

@end

// MyCLController.m

#import "MyCLController.h"

@implementation MyCLController

@synthesize locationManager;
@synthesize delegate;

- (id) init {
    self = [super init];
    if (self != nil) {
       self.locationManager = [[[CLLocationManager alloc] init] autorelease];
       self.locationManager.delegate = self;
    }
    return self;
}

- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation {
    [self.delegate locationUpdate:newLocation];
   [locationManager stopUpdatingLocation]; }

- (void)locationManager:(CLLocationManager *)manager
didFailWithError:(NSError *)error
{
   [self.delegate locationError:error];
}

- (void)dealloc {
    [self.locationManager release];
    [super dealloc];
}

@end


// Use the follwing code to get the current location latitude and longitude

- (void)viewDidLoad {

   [self setTitle:contactLocation];
    locationController = [[MyCLController alloc] init];
   locationController.delegate = self;
    [locationController.locationManager startUpdatingLocation];
    [super viewDidLoad];
}

- (void)locationUpdate:(CLLocation *)location {

    CLLocationCoordinate2D currentLocation = location.coordinate;
    latitude = currentLocation.latitude;
    longitude = currentLocation.longitude;
}

- (void)locationError:(NSError *)error {

    NSLog(@"Location Error Occured");
}