ios8 - how to get the distance between to points on earth in Swift? -


i used 2 methods .. apple's 1 

 @ibaction func getdistancepressed(sender: anyobject) {      distancelabel.text = "\(location_2.distancefromlocation(location_1))m" // meters  }

and mine 

  @ibaction func getdistancepressed(sender: anyobject) {      let lat1 = location_1.coordinate.latitude     let lon1 = location_1.coordinate.longitude     let lat2 = location_2.coordinate.latitude     let lon2 = location_2.coordinate.longitude       distancelabel.text = "\(getdistancefromlatloninmeter(lat1, lon1: lon1, lat2: lat2, lon2: lon2))m"  } func getdistancefromlatloninmeter(lat1 : double ,lon1 : double ,lat2 : double ,lon2 : double) -> double{       var earthradius : double = 6372797.560856 //inmeter      var deltalat : double = deg2rad(lat2 - lat1)     var deltalon : double = deg2rad(lon2 - lon1)      var latitudeh = sin(deltalat * 0.5)     latitudeh *= latitudeh      var lontitudeh = sin(deltalon * 0.5)     lontitudeh *= lontitudeh      var tmp = cos(deg2rad(lat2)) * cos(deg2rad(lat1));      return earthradius * 2.0 * asin(sqrt(latitudeh + tmp*lontitudeh))  } func deg2rad(deg : double) -> double {      return deg * 0.017453292519943295769236907684886 }

both giving me same value , , both wrong .. when move iphone around (1 meter) gives me 11 meters , when move 3 meters gives me 20 , , on . don't know problem . correct method thing .how distance??

for example --- >

firstlatitude - > 24.4348484485008

firstlongitude - > 39.6552843828735

lastlatitude - > 24.4349537442103

lastlongitude - > 39.6552204902715

it gives distance - > 13.379 m

it should 0.7 m (in real)


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