CLLocationManager 坐标

Question

我一直在努力为步行、骑自行车和驾车实施路线追踪地图。

但是，正如您在以下屏幕截图中看到的那样，即使我没有步行/骑自行车或开车到那个位置，我的坐标也会不时突然跳跃。已在图像上绘制圆圈以指出问题。我的问题是为什么突然坐标跳跃？

这是我的实现快照：

- (void)locationManager:(CLLocationManager *)manager 
    didUpdateToLocation:(CLLocation *)newLocation 
           fromLocation:(CLLocation *)oldLocation
{
    CoordinateModel *coord = [[CoordinateModel alloc] init];
    coord.latitude = newLocation.coordinate.latitude;
    coord.longitude = newLocation.coordinate.longitude;

    ActivityType currentActivityType = [DataManager sharedInstance].activityType;

        if (currentActivityType == 0) {
            // walking
            [appDelegate.walkingCoordinates addObject:coord];
        }
        else if(currentActivityType == 1) {
            [appDelegate.bikingCoordinates addObject:coord];
        }
        else if(currentActivityType == 2) {
            // driving
            [appDelegate.drivingCoordinates addObject:coord];
        }

     self.coordinate = newLocation.coordinate;
}

Answer 1

我建议您不要再使用委托方法locationManager:didUpdateToLocation:fromLocation:，它已被弃用。

您应该改用 locationManager:didUpdateLocations。

关于您的问题，您提到的位置“跳跃”是由于GPS在一定时间内无法确定您所在位置的准确性。如果您记录下所有时间的坐标和准确度，包括您在室内时，您会发现您在室内时的准确度呆在室内不好，连接Wifi时可能会看到准确度1414。当您在室内时，GPS 无法正常工作。因此，您的代码必须足够智能，以便仅在坐标足够好时才绘制路径或将坐标发送到服务器。

下面的代码是我用来过滤坏坐标的一些标准。

-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{

for(int i=0;i<locations.count;i++){
  CLLocation * newLocation = [locations objectAtIndex:i];
  CLLocationCoordinate2D theLocation = newLocation.coordinate;
  CLLocationAccuracy theAccuracy = newLocation.horizontalAccuracy;
  NSTimeInterval locationAge = -[newLocation.timestamp timeIntervalSinceNow];

  if (locationAge > 30.0)
      continue;

  //Select only valid location and also location with good accuracy
  if(newLocation!=nil&&theAccuracy>0
     &&theAccuracy<2000
     &&(!(theLocation.latitude==0.0&&theLocation.longitude==0.0))){
      self.myLastLocation = theLocation;
      self.myLastLocationAccuracy= theAccuracy;
      NSMutableDictionary * dict = [[NSMutableDictionary alloc]init];
      [dict setObject:[NSNumber numberWithFloat:theLocation.latitude] forKey:@"latitude"];
      [dict setObject:[NSNumber numberWithFloat:theLocation.longitude] forKey:@"longitude"];
      [dict setObject:[NSNumber numberWithFloat:theAccuracy] forKey:@"theAccuracy"];
      //Add the valid location with good accuracy into an array
      //Every 1 minute, I will select the best location based on accuracy and send to server
      [self.shareModel.myLocationArray addObject:dict];
    }
   }
 }

经过一段时间（例如：3分钟），我会再次从self.shareModel.myLocationArray中选择最佳坐标，然后在地图上绘制坐标并将坐标发送到服务器。

您可以从这里看到完整的解决方案和示例项目：Background Location Services not working in iOS 7

如果我的回答足够好，别忘了点赞。 ;)

Answer 2

同样的问题仍然存在于代码中。

  -(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{


    iNEAT_o_GamesAppDelegate *appDelegate = (iNEAT_o_GamesAppDelegate *)[[UIApplication sharedApplication] delegate];

    CoordinateModel *coord = [[CoordinateModel alloc] init];

    ActivityType currentActivityType = [DataManager sharedInstance].activityType;

    for(int i=0;i<locations.count;i++){
        CLLocation * newLocation = [locations objectAtIndex:i];
        CLLocationCoordinate2D theLocation = newLocation.coordinate;
        CLLocationAccuracy theAccuracy = newLocation.horizontalAccuracy;
        NSTimeInterval locationAge = -[newLocation.timestamp timeIntervalSinceNow];

        if (locationAge > 30.0)
            continue;

        //Select only valid location and also location with good accuracy
        if(newLocation!=nil&&theAccuracy>0
           &&theAccuracy<2000
           &&(!(theLocation.latitude==0.0&&theLocation.longitude==0.0))){
            coord.latitude = theLocation.latitude;
            coord.longitude = theLocation.longitude;

                   if (currentActivityType == 0) {
                        // walking
                        [appDelegate.walkingCoordinates addObject:coord];
                    }
                    else if(currentActivityType == 1) {
                        [appDelegate.bikingCoordinates addObject:coord];
                    }
                    else if(currentActivityType == 2) {
                        // driving
                        [appDelegate.drivingCoordinates addObject:coord];
                    }
        }
    }
}