Chamei o método abaixo para desenhar as polilinhas pontilhadas entre os marcadores. Quando se trata da execução, mostra que apenas linhas sólidas são desenhadas. Você poderia me dizer como desenhar linhas pontilhadas no Google Map?

- (void) createDashedLine:(CLLocationCoordinate2D )thisPoint:(CLLocationCoordinate2D )nextPoint:
(UIColor *)colour
{
    NSLog(@"next pt latitude %ff" , nextPoint.latitude);
    NSLog(@"next pt longitude %ff" , nextPoint.longitude);
    NSLog(@"this pt laatitude %ff" , thisPoint.latitude);
    NSLog(@"this pt longitude %ff" , thisPoint.longitude);

    double difLat = nextPoint.latitude - thisPoint.latitude;
    double difLng = nextPoint.longitude - thisPoint.longitude;
    double scale = camera.zoom * 2;
    double divLat = difLat / scale;
    double divLng = difLng / scale;
    CLLocationCoordinate2D tmpOrig= thisPoint;
    GMSMutablePath *singleLinePath = [GMSMutablePath path];

    for(int i = 0 ; i < scale ; i ++){
        CLLocationCoordinate2D tmpOri = tmpOrig;
        if(i > 0){
            tmpOri = CLLocationCoordinate2DMake(tmpOrig.latitude + (divLat * 0.25f), tmpOrig.longitude + (divLng * 0.25f));
        }
        [singleLinePath addCoordinate:tmpOri];
        [singleLinePath addCoordinate:
         CLLocationCoordinate2DMake(tmpOrig.latitude + (divLat * 1.0f),
                                    tmpOrig.longitude + (divLng * 1.0f))];
        tmpOri = CLLocationCoordinate2DMake(tmpOrig.latitude + (divLat * 1.0f), tmpOrig.longitude + (divLng * 1.0f));
    }

    GMSPolyline *polyline ;
    polyline = [GMSPolyline polylineWithPath:singleLinePath];
    polyline.geodesic = NO;
    polyline.strokeWidth = 5.f;
    polyline.strokeColor = colour;
    polyline.map = mapView_;

    //Setup line style and draw
    _lengths = @[@([singleLinePath lengthOfKind:kGMSLengthGeodesic] / 50)];
    _polys = @[polyline];
    [self setupStyleWithColour:colour];
    [self tick];
}

- (void)tick {
    //Create steps for polyline(dotted polylines)
    for (GMSPolyline *poly in _polys) {
        poly.spans =
        GMSStyleSpans(poly.path, _styles, _lengths, kGMSLengthGeodesic, _pos);
    }
    _pos -= _step;
}

-(void)setupStyleWithColour:(UIColor *)color{

    GMSStrokeStyle *gradColor = [GMSStrokeStyle gradientFromColor:color toColor:color];

    _styles = @[gradColor,[GMSStrokeStyle solidColor:[UIColor colorWithWhite:0 alpha:0]],];
    _step = 50000;
}

- (void)addMarkers
{
    // NSMutableArray *polys = [NSMutableArray array];
    if([CarArray count] > 0){


        GMSMutablePath *path = [GMSMutablePath path];
        GMSMutablePath *currentPath = [GMSMutablePath path];
        GMSPolyline *polyline ;
        GMSPolyline *polylineC ;
        GMSMarker *marker;
        for (int i = 0; i < [CarArray count]; i++) {

            CheckPoints *cp = [CarArray objectAtIndex:i];
            CLLocationCoordinate2D position = CLLocationCoordinate2DMake(cp.getLatitude , cp.getLongitude);

            marker = [GMSMarker markerWithPosition:position];
            //  GMSMarker *marker = [[GMSMarker alloc] init];
            marker.position = position;
            NSLog( @"%d", cp.getState );
            NSLog( @"%f", cp.getLatitude);
            NSLog( @"%f", cp.getLongitude );
            NSLog( @"%@", cp.getDesp );
            marker.title = cp.getDesp;

            marker.zIndex = 1;
            NSString *tmpLat = [[NSString alloc] initWithFormat:@"%f", position.latitude];
            NSString *tmpLong = [[NSString alloc] initWithFormat:@"%f", position.longitude];
            marker.snippet = [NSString stringWithFormat:@"%@ %@", tmpLat,tmpLong];
            UIColor *color;
            if (cp.getState ==0) {
                color = [UIColor greenColor];
            } else {
                color = [UIColor redColor];
            }

            if([CarArray count] > 2){
                [path addLatitude:cp.getLatitude longitude:cp.getLongitude];
                if(i > [CarArray indexOfObject:CarArray.lastObject] -2){
                    [currentPath addLatitude:cp.getLatitude longitude:cp.getLongitude];
                }
            }else{
                [currentPath addLatitude:cp.getLatitude longitude:cp.getLongitude];
            }
            marker.icon = [GMSMarker markerImageWithColor:color];

            marker.map = mapView_;
            //  mapView_.selectedMarker = marker;
        }

        if([CarArray count] > 2) {

            polyline = [GMSPolyline polylineWithPath:currentPath];
            polyline.geodesic = YES;
            polyline.strokeWidth = 5.f;
            polyline.strokeColor = [UIColor greenColor];
            polyline.map = mapView_;



            _lengths = @[@([currentPath lengthOfKind:kGMSLengthGeodesic] / 50)];
            _polys = @[polyline];

            [self setupStyleWithColour:[UIColor greenColor]];
            [self tick];


            for(int i = 0 ; i < [currentPath count] -1 ; i++){
                CLLocationCoordinate2D thisPoint = [currentPath coordinateAtIndex:i];
                CLLocationCoordinate2D nextPoint = [currentPath coordinateAtIndex:i+1];


                NSLog(@"next pt s latitude %ff" , nextPoint.latitude);
                NSLog(@"next pt s longitude %ff" , nextPoint.longitude);
                NSLog(@"this pt s latitude %ff" , thisPoint.latitude);
                NSLog(@"this pt s longitude %ff" , thisPoint.longitude);

                [self drawArrowLines:mapView_ :thisPoint :nextPoint :[UIColor greenColor]:i+1: false];
                [self createDashedLine: thisPoint :nextPoint :[UIColor greenColor]];
            }

            GMSMutablePath *path2 = [GMSMutablePath path];
            GMSMutablePath *path3 = [GMSMutablePath path];
            path2 = path.mutableCopy;

            [path2 removeLastCoordinate];
            path3 = path2;
            polylineC = [GMSPolyline polylineWithPath:path3];
            polylineC.geodesic = YES;
            polylineC.strokeWidth = 5.f;
            polylineC.map = mapView_;



            _lengths = @[@([currentPath lengthOfKind:kGMSLengthGeodesic] / 50)];
            _polys = @[polylineC];

            [self setupStyleWithColour:[UIColor greenColor]];
            [self tick];


       //     polylineC.strokeColor = [UIColor redColor];

            for(int i = 0 ; i < [path count] -1 ; i++){
                CLLocationCoordinate2D thisPoint = [path coordinateAtIndex:i];
                CLLocationCoordinate2D nextPoint = [path coordinateAtIndex:i+1];

                NSLog(@"next pt s latitude %ff" , nextPoint.latitude);
                NSLog(@"next pt s longitude %ff" , nextPoint.longitude);
                NSLog(@"this pt s latitude %ff" , thisPoint.latitude);
                NSLog(@"this pt s longitude %ff" , thisPoint.longitude);

                [self drawArrowLines:mapView_ :thisPoint :nextPoint :[UIColor redColor]: i+1 : true];
                [self createDashedLine: thisPoint :nextPoint :[UIColor redColor]];
            }
        }else{
            polyline = [GMSPolyline polylineWithPath:currentPath];
            polyline.geodesic = NO;
            polyline.strokeWidth = 5.f;
            polyline.strokeColor = [UIColor greenColor];
            polyline.map = mapView_;


            _lengths = @[@([currentPath lengthOfKind:kGMSLengthGeodesic] / 50)];
            _polys = @[polyline];

            [self setupStyleWithColour:[UIColor greenColor]];
            [self tick];

            for(int i = 0 ; i < [currentPath count] -1 ; i++){
                CLLocationCoordinate2D thisPoint = [currentPath coordinateAtIndex:i];
                CLLocationCoordinate2D nextPoint = [currentPath coordinateAtIndex:i+1];


                NSLog(@"next pt s latitude %ff" , nextPoint.latitude);
                NSLog(@"next pt s longitude %ff" , nextPoint.longitude);
                NSLog(@"this pt s latitude %ff" , thisPoint.latitude);
                NSLog(@"this pt s longitude %ff" , thisPoint.longitude);

                [self drawArrowLines:mapView_ :thisPoint :nextPoint :[UIColor greenColor] : i+1 : false];
                [self createDashedLine: thisPoint :nextPoint :[UIColor greenColor]];
            }
        }
    }
}