In this tutorial I will demonstrate you how to find you Location using a small IPhone App.
You can Integrate a MKMapKit/MKMapView to enhance this to make the output more graphical.
I will try to provide a small demo on that if I get time later.
Add the Core Location framework to your project to use the location data.
Add a few UILabel controls for displaying the longitude and latitude.For updating the labels we will need the associated
IBOutlets to these labels.If you are not familiar with IBAction/Outlets then refer to the apple documentation.
The sample code is as below
#import "<UIKit/UIKit.h>"
@interface MyLocationViewController : UIViewController {
IBOutlet UILabel *latitude;
IBOutlet UILabel *longitude;
}
@end
We will use the CLLocationManager class to send updates to a delegate when our the location changes.
The delegate associated to this class is CLLocationManagerDelegate so our view controller should implement
this delegate.
#import "<UIKit/UIKit.h>"
#import "<CoreLocation/CoreLocation.h>"
@interface MyLocationViewController : UIViewController < CLLocationManagerDelegate >
CLLocationManager *locationManager;
IBOutlet UILabel *latitude;
IBOutlet UILabel *longitude;
}
@end
In the viewDidLoad of the Viewcontroller configure the CLLocationManager settings like distanceFilter,desiredAccuracy etc and then call the startUpdatingLocation function of the CLLocationManager to get the delegate working.
- (void)viewDidLoad {
[super viewDidLoad];
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
[locationManager startUpdatingLocation];
}
From the delegate protocol implement the following delegate in your viewController
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation
The full body of the implementation will be
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation
{
int degrees = newLocation.coordinate.latitude;
double decimal = fabs(newLocation.coordinate.latitude - degrees);
int minutes = decimal * 60;
double seconds = decimal * 3600 - minutes * 60;
NSString *lat = [NSString stringWithFormat:@"%d° %d' %1.4f\"",
degrees, minutes, seconds];
latitude.text = lat;
degrees = newLocation.coordinate.longitude;
decimal = fabs(newLocation.coordinate.longitude - degrees);
minutes = decimal * 60;
seconds = decimal * 3600 - minutes * 60;
NSString *longt = [NSString stringWithFormat:@"%d° %d' %1.4f\"",
degrees, minutes, seconds];
longitude.text = longt;
}
Here we take the location and turn the degrees into degrees, minutes, and seconds then display the value in the correct label.
For the mathematical calculation remember Each 1 degree= 60 minutes = 3600 seconds.
