Since V6.6.3地图SDK支持BMKTextPathMarker路名绘制；注意BMKTextPathMarker与普通Marker无关，是个单独的overlay

BMKMapView *mapView = [[BMKMapView alloc]initWithFrame:self.view.bounds];
mapView.delegate = self;
[self.view addSubView:mapView];

使用BMKTextPathMarker创建一个带有text文本的Overlay，调用BMKMapView的addOverlay或addOverlays方法添加BMKTextPathMarker到地图上。

以下是配合驾车路线规划接口数据，绘制的路线及路名：

- (void)onGetDrivingRouteResult:(BMKRouteSearch*)searcher result:(BMKDrivingRouteResult*)result errorCode:(BMKSearchErrorCode)error {
    NSLog(@"onGetDrivingRouteResult");
//    [_mapView removeOverlays:_mapView.overlays];
//    [_mapView removeAnnotations:_mapView.annotations];
    
    if (error == BMK_SEARCH_NO_ERROR) {
        NSMutableArray *routeNames = [NSMutableArray array];
        //获取所有驾车路线中第一条路线
        BMKDrivingRouteLine *routeline = (BMKDrivingRouteLine *)result.routes.firstObject;
        NSMutableArray<NSNumber *> *textIndexs = [NSMutableArray array];

        /// 路段的路况信息，成员为NSNumber。0：无数据；1：畅通；2：缓慢；3：拥堵
//        @property (nonatomic, copy) NSArray <NSNumber *> *traffics;
        //+polylineWithPoints: count:指定的直角坐标点数组
        BMKMapPoint *points = new BMKMapPoint[routeline.totalPointsCount];
        __block NSUInteger j = 0;
        //遍历驾车路线中的所有路段
        [routeline.steps enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
            //获取驾车路线中的每条路段
            BMKDrivingStep *step = routeline.steps[idx];
            
            //路名相关
            BMKTextPathMarker *routeName = [BMKTextPathMarker textPathMarkerWithPoints:step.points count:step.pointsCount];
            routeName.text = step.roadName;
            BMKTextStyle *style = [[BMKTextStyle alloc] init];
            style.textColor = [UIColor blackColor];
            style.fontSize = 25;
            style.borderColor = [UIColor whiteColor];
            style.borderWidth = 1;
            routeName.style = style;
            [routeNames addObject:routeName];

            //遍历每条路段所经过的地理坐标集合点
            for (NSUInteger i = 0; i < step.pointsCount; i ++) {
                //将每条路段所经过的地理坐标点赋值给points
                points[j].x = step.points[i].x;
                points[j].y = step.points[i].y;
                j ++;
            }
            
            for (int k = 0; k < step.traffics.count; k ++) {
                [textIndexs addObject:step.traffics[k]];
            }
            
        }];

        BMKMultiPolyline *polyline = [BMKMultiPolyline multiPolylineWithPoints:points count:routeline.totalPointsCount drawIndexs:textIndexs];
        // 释放points
        delete[] points;
        points = nil;
        // 添加路线
        [_mapView addOverlay:polyline];
        // 添加路名
        if (routeNames && routeNames.count) {
            [_mapView addOverlays:routeNames];
        }
    }
}

/// 根据overlay生成对应的View
/// @param mapView 地图View
/// @param overlay 指定的overlay
/// @return 生成的覆盖物View
- (__kindof BMKOverlayView *)mapView:(BMKMapView *)mapView viewForOverlay:(id<BMKOverlay>)overlay {
     if ([overlay isKindOfClass:[BMKMultiPolyline class]]) {
        BMKMultiTexturePolylineView *multiTexturePolylineView = [[BMKMultiTexturePolylineView alloc] initWithMultiPolyline:overlay];
        multiTexturePolylineView.lineWidth = 8.0;
        multiTexturePolylineView.textureImages = @[[UIImage imageNamed:@"traffic_texture_congestion"],
                                                   [UIImage imageNamed:@"traffic_texture_slow"],
                                                   [UIImage imageNamed:@"traffic_texture_smooth"],
                                                   [UIImage imageNamed:@"traffic_texture_unknown"]];
        return multiTexturePolylineView;
    }
 else if ([overlay isKindOfClass:[BMKTextPathMarker class]]) {
        BMKTextPathMarkerView *textPathMarker = [[BMKTextPathMarkerView alloc] initWithMarker:overlay];
        return textPathMarker;
    }
    return nil;
}

运行效果如下：