Calculating Distance between two coordinates using CLLocation - ios

Question

I'm using CLLocationDistance to get the distance between two points, but I'm getting an error when passing my current location in it.
CLLocation *current = [[CLLocation alloc] initWithLatitude:startLocation.coordinate.latitude longitude:startLocation.coordinate.longitude];
CLLocation *itemLoc = [[CLLocation alloc] initWithLatitude:[[[getName objectAtIndex:indexPath.row] objectForKey:#"lat"] doubleValue] longitude:[[[getName objectAtIndex:indexPath.row] objectForKey:#"lon"] doubleValue]];
//Here the current location gives me an error "Initializing cllocation with an expression incompatible format"
CLLocationDistance *itemDist = [itemLoc distanceFromLocation:current];
NSLog(#"Distance: %#", itemDist);

Answer 1

The error you're getting is actually:
Initializing 'CLLocationDistance *' (aka 'double *') with an expression of incompatible type 'CLLocationDistance' (aka 'double')
What it's saying is you're initializing itemDist (which you've declared as a CLLocationDistance *) to something that is returning a CLLocationDistance (notice no asterisk).
CLLocationDistance is not an object.
It is just a primitive type (specifically double -- see the Core Location Data Types Reference).
So instead of declaring itemDist as a pointer to a CLLocationDistance, just declare it as a CLLocationDistance (no asterisk):
CLLocationDistance itemDist = [itemLoc distanceFromLocation:current];
You'll also need to update the NSLog to expect a double instead of an object otherwise it will crash at run-time:
NSLog(#"Distance: %f", itemDist);

Answer 2

Is swift 2.0 is in the following way:
let userLocation:CLLocation = CLLocation(latitude: 11.11, longitude: 22.22)
let priceLocation:CLLocation = CLLocation(latitude: 33.33, longitude: 44.44)
let meters:CLLocationDistance = userLocation.distanceFromLocation(priceLocation)

Answer 3

Below code will work for you
in view load
//************************** GEtting USer's latitude/ Longitude ********************
self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self;
[self.locationManager startUpdatingLocation];
//************************** GEtting USer's latitude/ Longitude ********************
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);
CLLocation *currentLocation = newLocation;
if (currentLocation != nil) {
CLLocation *locA = [[CLLocation alloc] initWithLatitude:currentLocation.coordinate.longitude longitude:currentLocation.coordinate.latitude];
CLLocation *locB = [[CLLocation alloc] initWithLatitude:11.111111111111111 longitude:11.1111111111111111];
User_Vanue_Distance = [locA distanceFromLocation:locB];
NSLog(#"THIS IS THE DISTANCE BT TWO POINTS +++++++++++++++++++++%f",User_Vanue_Distance);
}
}
You need to put below keys in info.plist, in ios 8 to access location we need to put below keys in info.plist
1. NSLocationWhenInUseUsageDescription : Location required
2. NSLocationAlwaysUsageDescription Needed : Location Needed
This will work for you but one thing you need to add is add a check for ios8. otherwise this will crash on ios 7
// Check for iOS 8. Without this guard the code will crash with "unknown selector" on iOS 7.
if ([self.locationManager respondsToSelector:#selector(requestWhenInUseAuthorization)]) {
[self.locationManager requestWhenInUseAuthorization];
}
Hope this will work for you. :)

Answer 4

To find distance in KM from two different Lat & Long
let userLocation:CLLocation = CLLocation(latitude: 23.0320, longitude: 72.5250)
let priceLocation:CLLocation = CLLocation(latitude: 23.0283, longitude: 72.5067)
let distance = String(format: "%.2f km", userLocation.distanceFromLocation(priceLocation)/1000)
print("Distance is KM is:: \(distance)")