CLLocation生成奇怪的错误

Question

我有一个CLLocation的问题。
我想知道两个坐标之间的距离旁边的位置在的tableView标题表现出来：

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：

有谁有可能的解决方案？

谢谢！

Answer 1

您是否包含Core Location以及MapKit？