iOS : How to plot polyline on existing route? - ios

Question

I plot the route between source and destination using the following piece of code. After plotting the route sucessfully, I get a list of coordinates where I wanted to plot another route on top of existing one with different color.
The use case I am trying to code is, we set source and destination, plot the dotted route once, then plot the actual line based on the list of locations
From the code, I can see the dotted line but can not see the another line overlapping on it.
My code is:
-(void) getDirection {
CLLocationCoordinate2D sourceCoords = CLLocationCoordinate2DMake(42.130655, -71.041158);
MKPlacemark *sourcePlacemark = [[MKPlacemark alloc] initWithCoordinate:sourceCoords addressDictionary:nil];
MKMapItem *source = [[MKMapItem alloc] initWithPlacemark:sourcePlacemark];
// Make the destination location
CLLocationCoordinate2D destinationCoords = CLLocationCoordinate2DMake(42.128121, -70.936151); MKPlacemark *destinationPlacemark = [[MKPlacemark alloc] initWithCoordinate:destinationCoords addressDictionary:nil];
MKMapItem *destination = [[MKMapItem alloc] initWithPlacemark:destinationPlacemark];
MKDirectionsRequest *directionsRequest = [MKDirectionsRequest new];
[directionsRequest setSource:source];
[directionsRequest setDestination:destination];
[self sourceMarker:sourcePlacemark];
[self destinationMarker:destinationPlacemark];
//
//routeCoords
NSInteger nuberOfStesps = routeCoords.count;
CLLocationCoordinate2D *pointsCoordinate = (CLLocationCoordinate2D *)malloc(sizeof(CLLocationCoordinate2D) * nuberOfStesps);
for (NSInteger index=0; index < nuberOfStesps; index++) {
CLLocation *location = [routeCoords objectAtIndex:index];
coordinate2 = location.coordinate;
//NSLog(#"Location Latitide : %f", coordinate2.latitude);
//NSLog(#"Location Longitude : %f", coordinate2.longitude);
pointsCoordinate[index] = CLLocationCoordinate2DMake(coordinate2.latitude, coordinate2.longitude);
}
routeLine = [MKPolyline polylineWithCoordinates:pointsCoordinate count:nuberOfStesps];
// free(pointsCoordinate);
routeLine.title = #"New points";
[self.mapView addOverlay:routeLine];
//
MKDirections *directions = [[MKDirections alloc] initWithRequest:directionsRequest];
[directions calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {
if (error) {
NSLog(#"There was an error getting your directions");
return;
}else {
[self showRoute:response];
}
}];
}
- (void) showRoute:(MKDirectionsResponse * ) response {
_currentRoute = [response.routes firstObject];
[self.mapView setVisibleMapRect:_currentRoute.polyline.boundingMapRect animated:NO];
[self.mapView removeOverlays:self.mapView.overlays];
[self.mapView addOverlay:_currentRoute.polyline level:MKOverlayLevelAboveRoads];
}
- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay {
if ([overlay isKindOfClass:[MKPolyline class]]) {
MKPolylineRenderer *renderer = [[MKPolylineRenderer alloc] initWithOverlay:overlay];
[renderer setStrokeColor:[UIColor redColor]];
[renderer setLineWidth:4.0];
[renderer setLineDashPattern:#[#2, #5]];
[renderer setStrokeColor:[UIColor redColor]];
return renderer;
}
return nil;
}
I followed this thread iOS Maps draw route (line) between several points (geopoints)
But it did not work for me. What am I doing wrong?