这个百度差不多给出来了只是默认取得第一条

#pragma mark - 驾车

- (void)onGetDrivingRouteResult:(BMKRouteSearch*)searcher result:(BMKDrivingRouteResult*)result errorCode:(BMKSearchErrorCode)error
{
    NSArray* array = [NSArray arrayWithArray:_mapView.annotations];
    [_mapView removeAnnotations:array];
    array = [NSArray arrayWithArray:_mapView.overlays];
    [_mapView removeOverlays:array];
    if (error == BMK_SEARCH_NO_ERROR) {
        for (int j = 0;j<result.routes.count ; j++) {
            BMKDrivingRouteLine* plan = (BMKDrivingRouteLine*)[result.routes objectAtIndex:j];
            
            mycolor = [[UIColor alloc] initWithRed:j==0?0.2:1 green:j==1?0.2:1 blue:j==2?0.2:1 alpha:0.7];
            // 计算路线方案中的路段数目
            NSInteger size = [plan.steps count];
            int planPointCounts = 0;
            for (int i = 0; i < size; i++) {
                BMKDrivingStep* transitStep = [plan.steps objectAtIndex:i];
                if(i==0){
                    RouteAnnotation* item = [[RouteAnnotation alloc]init];
                    item.coordinate = plan.starting.location;
                    item.title = @"起点";
                    item.type = 0;
                    [_mapView addAnnotation:item]; // 添加起点标注
                    
                }else if(i==size-1){
                    RouteAnnotation* item = [[RouteAnnotation alloc]init];
                    item.coordinate = plan.terminal.location;
                    item.title = @"终点";
                    item.type = 1;
                    [_mapView addAnnotation:item]; // 添加起点标注
                }
                //添加annotation节点
                RouteAnnotation* item = [[RouteAnnotation alloc]init];
                item.coordinate = transitStep.entrace.location;
                item.title = transitStep.entraceInstruction;
                item.degree = transitStep.direction * 30;
                item.type = 4;
                [_mapView addAnnotation:item];
                
                NSLog(@"%@   %@    %@", transitStep.entraceInstruction, transitStep.exitInstruction, transitStep.instruction);
                
                //轨迹点总数累计
                planPointCounts += transitStep.pointsCount;
            }
            // 添加途经点
            if (plan.wayPoints) {
                for (BMKPlanNode* tempNode in plan.wayPoints) {
                    RouteAnnotation* item = [[RouteAnnotation alloc]init];
                    item = [[RouteAnnotation alloc]init];
                    item.coordinate = tempNode.pt;
                    item.type = 5;
                    item.title = tempNode.name;
                    [_mapView addAnnotation:item];
                }
            }
            //轨迹点
            BMKMapPoint * temppoints = new BMKMapPoint[planPointCounts];
            int i = 0;
            for (int j = 0; j < size; j++) {
                BMKDrivingStep* transitStep = [plan.steps objectAtIndex:j];
                int k=0;
                for(k=0;k<transitStep.pointsCount;k++) {
                    temppoints[i].x = transitStep.points[k].x;
                    temppoints[i].y = transitStep.points[k].y;
                    i++;
                }
                
            }
            // 通过points构建BMKPolyline
            BMKPolyline* polyLine = [BMKPolyline polylineWithPoints:temppoints count:planPointCounts];
            [_mapView addOverlay:polyLine]; // 添加路线overlay
            delete []temppoints;
            [self mapViewFitPolyLine:polyLine];
        }
       
    }
}