在iPhone MapView上显示当前位置和所需位置之间的路线

Question

我想在MKMapView上显示当前位置和所需位置之间的路线作为注释.

做这个的最好方式是什么？

Answer 1

///在.h中添加委托 MKMapViewDelegate

///在.m文件中

- (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 <MKOverlay>)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;

}