Helper functions to calculate the distance between two coordinates and to create a distance string

gistfile1.m

CLLocationDistance distanceBetweenCoordinates(CLLocationDegrees startLat, CLLocationDegrees startLng,
                                              CLLocationDegrees endLat, CLLocationDegrees endLng)
{
    CLLocation *locA = [[CLLocation alloc] initWithLatitude:startLat
                                                          longitude:startLng];
    
    CLLocation *locB = [[CLLocation alloc] initWithLatitude:endLat
                                                          longitude:endLng];
    
    return [locA distanceFromLocation:locB];
}

NSString* distanceString(CLLocationDistance distance)
{
    NSString *distanceString;
    
    if (distance >= 1000)
    {
        distanceString = [NSString stringWithFormat:@"%.1lf km", distance/1000.0f];
    }
    else
    {
        distanceString = [NSString stringWithFormat:@"%d m", (int)distance];
    }
    
    return distanceString;
}