HERE Maps Distance to Destination 总是返回高值

Posted 2023-03-12

【中文标题】HERE Maps Distance to Destination 总是返回高值

【英文标题】：HERE Maps Distance to Destination always returns high Value

【发布时间】：2016-01-09 10:09:41

【问题描述】：

我在此处的地图中计算了一条路线，并使用该路线开始了逐向导航。离线时一切正常，当我尝试使用

计算到达目的地的距离时

double distance = [NMANavigationManager sharedNavigationManager].distanceToDestination; 

上述方法返回的值非常高，例如184467440737095520000。即使对于不同的路由，返回值总是184467440737095520000。当我提到导航管理器委托时，我发现此方法将返回以米为单位的值。但是即使这个返回值也太高了我的目的地距离..请指导我如何正确计算到我的目的地的距离..提前谢谢

-(void)CalculateRoute:(NMARoutingMode *)routingMode


routeManager = [NMARouteManager sharedRouteManager];
routeManager.delegate = self;
NSMutableArray* stopList = [NSMutableArray array];
[stopList addObject:_StartCoordinate];
[stopList addObject:_DestinationCoordinate];

NSLog(@"routing from [%.5f,%.5f] to [%.5f,%.5f]", ((NMAGeoCoordinates*)stopList[0]).latitude, ((NMAGeoCoordinates*)stopList[0]).longitude,
      ((NMAGeoCoordinates*)stopList[1]).latitude, ((NMAGeoCoordinates*)stopList[1]).longitude);
NSLog(@"routingMode===>%@",routingMode.description);


[routeManager calculateRouteWithStops:stopList routingMode:routingMode];
 


-(IBAction)StartNav:(UIButton*)sender

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(positionDidUpdate)
                                             name:NMAPositioningManagerDidUpdatePositionNotification

                                           object:[NMAPositioningManager sharedPositioningManager]];
[NMANavigationManager sharedNavigationManager].map = self.mapView;
[NMANavigationManager sharedNavigationManager].delegate = self;
[NMANavigationManager sharedNavigationManager].mapTrackingAutoZoomEnabled = YES;
[NMANavigationManager sharedNavigationManager].mapTrackingEnabled = YES;
[NMANavigationManager sharedNavigationManager].mapTrackingOrientation = NMAMapTrackingOrientationDynamic;
[NMANavigationManager sharedNavigationManager].speedWarningEnabled = YES;
[NMANavigationManager sharedNavigationManager].mapTrackingTilt = NMAMapTrackingTilt2D;
[[NMANavigationManager sharedNavigationManager]startTurnByTurnNavigationWithRoute:_route];

【参考方案1】：

计算距离时出错。值 184467440737095520000 等于 NMANavigationManagerInvalidValue 常量。

尝试在您的位置更新时计算距离，因此请在您提到的 positionDidUpdate 方法中执行此操作：

double distance = [NMANavigationManager sharedNavigationManager].distanceToDestination;

如果你想在调用startTurnByTurnNavigationWithRoute方法后第一次这样做，你应该从路由中得到这样的信息：

double distance = _route.length;

顺便说一句，如果你尝试对 timeToArrival 做同样的事情，你也会得到一个很高的价值。

【参考方案2】：

distanceToDestination 是不是 double 值。它是一个unsigned long long 值或NMAUint64 值。

执行以下操作：

unsigned long long distance = [NMANavigationManager sharedNavigationManager].distanceToDestination; 

或

NMAUint64 distance = [NMANavigationManager sharedNavigationManager].distanceToDestination;