iPhone: Sorting based on location

Question

I have been working on an iPhone app, where-in i have list of users in a NSMutableArray like below.

myMutableArray: (
    {
        FirstName = Getsy;
               


        

Answer 1

First thing, you will need to calculate the distance between your current location and the location of each other user.

Talking mathematically, here is a Wolfram|Alpha example

Now "programmatic-ally", you can use CLLocation class, here is an example:

(CLLocationDistance)getDistanceFrom:(const CLLocation *)location

But first you will need to create the location object from your Latitude and Longitude. You can use:

(id)initWithLatitude:(CLLocationDegrees)latitude longitude:(CLLocationDegrees)longitude