CLLocation生成奇怪的错误

Question

我遇到了CLLocation的问题 我想知道两个坐标之间的距离，以便在tableView中的位置标题旁显示它：

    static NSString *CellIdentifier = @"Cell";

 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
 if (cell == nil) {
  cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier] autorelease];
 }

 // The first CLLocation based on the coordinates my MKMapView gives me.
 CLLocation *userLocation = [[CLLocation alloc] initWithLatitude:mapView.userLocation.coordinate.latitude longitude:mapView.userLocation.coordinate.longitude];

    // The second CLLocation based on the coordinates which are saved as a NSNumber in my own object
 CLLocation *locationForIndex = [[CLLocation alloc] initWithLatitude:[[[locations objectAtIndex:indexPath.row] latitude] doubleValue] longitude:[[[locations objectAtIndex:indexPath.row] longitude] doubleValue]];
 CLLocationDistance distance = [userLocation distanceFromLocation:locationForIndex];

 cell.textLabel.text = [[locations objectAtIndex:indexPath.row] title];
 cell.detailTextLabel.text = [[NSString alloc] initWithString:[NSString stringWithFormat:@"%d", distance]];

 return cell;

现在我得到的错误是：

有没有人有可能的解决方案？

谢谢！

Answer 1

您是否已将Core Location框架与MapKit一起包含在内？