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i want to calculat between two location on swift

i try make this func from objective c to swift but not work :

-(double) bearingToLocation:(CLLocation *) destinationLocation {

     double lat1 = DegreesToRadians(self.coordinate.latitude);
     double lon1 = DegreesToRadians(self.coordinate.longitude);

     double lat2 = DegreesToRadians(destinationLocation.coordinate.latitude);
     double lon2 = DegreesToRadians(destinationLocation.coordinate.longitude);

     double dLon = lon2 - lon1;

     double y = sin(dLon) * cos(lat2);
     double x = cos(lat1) * sin(lat2) - sin(lat1) * cos(lat2) * cos(dLon);
     double radiansBearing = atan2(y, x);

     return RadiansToDegrees(radiansBearing);

can any one know how can do this ?