CLLocation distanceFromLocation大值

Question

我和CLLocation distanceFromLocation有点问题。我有下面的代码，格式化以帮助调试，显式分配两个新的位置等。无论哪种方式，两个几乎相同的位置导致一个巨大的差距，但只是偶尔。

代码：

CLLocation *loc = [LightweightLocationTracker sharedLocationTracker].lastLocation;
if (loc)
{
  CLLocation *myLoc = [[CLLocation alloc] initWithLatitude:loc.coordinate.latitude longitude:loc.coordinate.longitude];
  CLLocation *productLoc = [[CLLocation alloc] initWithLatitude:self.productToView.latitude longitude:self.productToView.longitude];        
  CLLocationDistance dist = [myLoc distanceFromLocation:productLoc];

  NSLog(@"myLoc.coordinate.latitude %f", myLoc.coordinate.latitude);        
  NSLog(@"myLoc.coordinate.longitude %f", myLoc.coordinate.longitude);                
  NSLog(@"productLoc.coordinate.latitude %f", productLoc.coordinate.latitude);
  NSLog(@"productLoc.coordinate.longitude %f", productLoc.coordinate.longitude);
  NSLog(@"dist %f", dist);        
  NSLog(@"%1.1f km", dist);
}

一次运行TTY：

[] tapped main
[] myLoc.coordinate.latitude 52.369200
[] myLoc.coordinate.longitude 13.941100
[] productLoc.coordinate.latitude 52.364400
[] productLoc.coordinate.longitude 13.360600
[] dist 39542.386770
[] 39542.4 km

另一个运行TTY：

[] myLoc.coordinate.latitude 52.369200
[] myLoc.coordinate.longitude 13.941100
[] productLoc.coordinate.latitude 52.369202
[] productLoc.coordinate.longitude 13.941100
[] dist 0.184915
[] 0.2 km

没有看到罪魁祸首。

Answer 1

好的，distanceFromLocation返回米。所以30k的东西只有30千米。在我看来是完全合法的。