iOS - Core Location - sample code for initializing Core Location and implementing CLLocationManagerDelegate delegate methods.

iOS - Core Location - sample code

/*----------------------------------------------------------------------------------------------------------------------------------
    Description:
    iOS - Core Location - sample code for initializing Core Location and implementing CLLocationManagerDelegate delegate methods. 
  ----------------------------------------------------------------------------------------------------------------------------------*/


//interface file ...

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

@interface MyViewController : UIViewController<CLLocationManagerDelegate>

@end


//implementation file ...

@interface MyViewController ()

@property (nonatomic, strong) CLLocationManager *locationManager;

- (void)initializeLocationManager;

@end


@implementation MyViewController

@synthesize locationManager = _locationManager;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    
    if (self)
    {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    [self initializeLocationManager];
}

- (void)viewWillAppear:(BOOL)animated
{
    if(self.locationManager)
    {
        [self.locationManager startUpdatingLocation];
    }
}

- (void)viewWillDisappear:(BOOL)animated
{
    if(self.locationManager)
    {
        [self.locationManager stopUpdatingLocation];
    }
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    
    if(self.locationManager)
    {
        [self.locationManager stopUpdatingLocation];
        
        self.locationManager = nil;
    }
}


#pragma mark - Class Extension methods

- (void)initializeLocationManager
{
    self.locationManager = [[CLLocationManager alloc] init];
    
    self.locationManager.delegate = self;
    
    [self.locationManager setActivityType:CLActivityTypeOtherNavigation]; //change as needed
    
    [self.locationManager setDesiredAccuracy:kCLLocationAccuracyBest]; //change as needed
    
    [self.locationManager setDistanceFilter:50.0]; //change as needed
}


#pragma mark - CLLocationManagerDelegate methods

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
    
    CLLocation *newLocation = [locations lastObject];
    
    CLLocationCoordinate2D coord;
        
    coord.latitude = newLocation.coordinate.latitude;
        
    coord.longitude = newLocation.coordinate.longitude;
        
    //do stuff with location
}

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
    if(error.code == kCLErrorDenied) //user has denied the App to use location
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Location Services Disabled" message:@"Please Enable Location Services" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        
        [alert show];
    }
    else if(error.code == kCLErrorLocationUnknown) //no location could be found
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Location Unknown" message:@"Sorry, we could not get your location.  Please Enable Location Services." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        
        [alert show];
    }
    else
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Could Not Get Your Location" message:[error description] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        
        [alert show];
    }
    
    //stop polling for location
    [self.locationManager stopUpdatingLocation];
}


@end