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I'm trying to trace a route on a MKMapView using overlays (MKOverlay). However, depending on the current speed, I want to do something like the Nike app with a gradient while tracing the route, if the color is changing (for example, from green to orange if a user is driving from 65mph to 30mph). Here's a screenshot of what I want: So every 20 meters, I adding an overlay from the old to the new coordinates using: // Create a c array of points. MKMapPoint *pointsArray = malloc(sizeof(CLLocationCoordinate2D) * 2); // Create 2 points. MKMapPoint startPoint = MKMapPointForCoordinate(CLLocationCoordinate2DMake(oldLatitude, oldLongitude)); MKMapPoint endPoint = MKMapPointForCoordinate(CLLocationCoordinate2DMake(newLatitude, newLongitude)); // Fill the array. pointsArray[0] = startPoint; pointsArray[1] = endPoint; // Erase polyline and polyline view if not nil. if (self.routeLine != nil) self.routeLine = nil; if (self.routeLineView != nil) self.routeLineView = nil; // Create the polyline based on the array of points. self.routeLine = [MKPolyline polylineWithPoints:pointsArray count:2]; // Add overlay to map. [self.mapView addOverlay:self.routeLine]; // clear the memory allocated earlier for the points. free(pointsArray); // Save old coordinates. oldLatitude = newLatitude; oldLongitude = newLongitude; Basically I'm adding a lot of little overlays. Then I would like to create the gradient on this little line drawing, so I'm trying to do so in the overlay delegate: - (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay { MKOverlayView* overlayView = nil; if(overlay == self.routeLine) { // If we have not yet created an overlay view for this overlay, create it now. if(self.routeLineView == nil) { self.routeLineView = [[[MKPolylineView alloc

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