Show route between current and desired location on iPhone MapView

Question

I want to show a route on a MKMapView between the current location and a desired location as an annotation.

What is the best way to do this?

Answer 1

///in .h add delegate MKMapViewDelegate

///in .m file

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation     *)newLocation fromLocation:(CLLocation *)oldLocation
{

     CLLocationCoordinate2D newcordinate =   newLocation.coordinate;
     CLLocationCoordinate2D oldcordinate =   oldLocation.coordinate;

       MKMapPoint * pointsArray =
               malloc(sizeof(CLLocationCoordinate2D)*2);

           pointsArray[0]= MKMapPointForCoordinate(oldcordinate); 
           pointsArray[1]= MKMapPointForCoordinate(newcordinate);    

            MKPolyline *  routeLine = [MKPolyline polylineWithPoints:pointsArray count:2];
           free(pointsArray);

            [MapView addOverlay:routeLine];  //MkMapView declared in .h
}

//MKMapViewDelegate

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id )overlay
{
    MKOverlayView* overlayView = nil;


          MKPolylineView  * _routeLineView = [[[MKPolylineView alloc]                   initWithPolyline:self.routeLine] autorelease];
            _routeLineView.fillColor = self.PathColor;
           _routeLineView.strokeColor = self.PathColor;
          _routeLineView.lineWidth = 15;
            _routeLineView.lineCap = kCGLineCapSquare;


            overlayView = _routeLineView;

            return overlayView;

}