iOS: How to get the distance of multiple location from one location - ios

Question

i am working on a project in which i have to show the distance of multiple locations from user's locations. locations are based on latitude and longitude.
i am using the following code to get the distance between two locations is shows nearly same distance
CLLocation *locA = [[CLLocation alloc] initWithLatitude:28.6379 longitude: 77.2432];
CLLocation *locB = [[CLLocation alloc] initWithLatitude:28.6562 longitude:77.2410];
CLLocationDistance distance = [locA distanceFromLocation:locB];
NSLog(#"Distance is %f",distance);
float i = distance/1000;
NSLog(#"distance between two places is %f KM", i);
but now i am struct to get the distance of multiple locations from my location: locaA.
for example i take NSarray for latitude and longitude as
NSArray * latArray = [[NSArray alloc]initWithObjects:#"28.6129",#"28.6020",#"28.5244", nil];
NSArray * longArray = [[NSArray alloc]initWithObjects:#"77.2295",#"77.2478",#"77.1855", nil];
Please help me to resolve it
Take locaA as user's location

Answer 1

You can use below method to find distance
#define DEG2RAD(degrees) (degrees * 0.01745327)
double currentLatitudeRad = DEG2RAD(currentLatitude);
double currentLongitudeRad = DEG2RAD(currentLongitude);
double destinationLatitudeRad = DEG2RAD(destinationLatitude);
double destinationLongitudeRad = DEG2RAD(destinationLongitude);
double distance = acos(sin(currentLatitudeRad) * sin(destinationLatitudeRad) + cos(currentLatitudeRad) * cos(destinationLatitudeRad) * cos(currentLongitudeRad - destinationLongitudeRad)) * 6880.1295896;
Here, currentLatitude and currentLongitude is user's location. destinationLatitude and destinationLongitude is each object from your array "latArray" and "longArray" which you can iterate via for loop. distance is the distance between user's location and locations in array. Obtained distance will be in kilometres.

Answer 2

CLLocation *currentLocation = ... // This is a reference to your current location as a CLLocation
NSArray *arrayOfOtherCLLocationObjects = ... // This is an array that contains all of the other points you want to calculate the distance to as CLLocations
NSMutableArray *distancesFromCurrentLocation = [[NSMutableArray alloc] initWithCapacity:arrayOfOtherCLLocationObjects.count]; // We will add all of the calculated distances to this array
for (CLLocation *location in arrayOfOtherCLLocationObjects) // Iterate through each location object
{
CLLocationDistance distance = [location distanceFromLocation:currentLocation]; // Calculate distance
[distancesFromCurrentLocation addObject:#(distance)]; // Append distance to array. You need to wrap the distance object as an NSNumber so you can append it to the array.
}
// At this point, you have the distance for each location point in the array distancesFromCurrentLocation

Answer 3

Swift version:
let currentLocation: CLLocation = //current location
let otherLocations: [CLLocation] = //the locations you want to know their distance to currentLocation
let distances = otherLocations.map { $0.distanceFromLocation(currentLocation) }