获取地址时CLLocationManager stopUpdatingLocation，但地址标签仍为空

Question

我有一个在某些标签上显示当前位置的应用。在viewDidLoad我调用[gps startUpdatingLocation];（CLLocationManager的实例），所以gps调用相关方法：

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
    //NSLog(@"didUpdateToLocation: %@", newLocation);
    currentLocation = newLocation;

    if (currentLocation != nil) {
        longitude.text = [NSString stringWithFormat:@"%.3f", currentLocation.coordinate.longitude];
        latitude.text = [NSString stringWithFormat:@"%.3f", currentLocation.coordinate.latitude];
    }

    NSLog(@"Resolving the Address");
    [geocoder reverseGeocodeLocation:currentLocation completionHandler:^(NSArray *placemarks, NSError *error) {
        NSLog(@"Found placemarks: %@, error: %@", placemarks, error);
        if (error == nil && [placemarks count] > 0) {
            placemark = [placemarks lastObject];
            [address sizeToFit];
            address.text = [NSString stringWithFormat:@"%@, %@\n%@ %@\n%@",
                            [self sanitizedDescription:placemark.thoroughfare],
                            [self sanitizedDescription:placemark.subThoroughfare],
                            [self sanitizedDescription:placemark.postalCode],
                            [self sanitizedDescription:placemark.locality],
                            [self sanitizedDescription:placemark.country]];

            if (address.text != NULL)
            {
                [gps stopUpdatingLocation];
            }
        } else {
            NSLog(@"%@", error.debugDescription);
        }
    } ];

}

所以在获取地址的时候，gps必须是stopUpdatingLocation。一切正常，但应用内address 标签仍然为空！为什么？

P.S.：sanitizedDescription 是一个简单的方法，如果 placemark.value 是 nil，则返回“...”：

- (id)sanitizedDescription:(NSString *)obj
{
    if (obj == nil)
    {
        obj = @"...";
        return obj;
    }

    return obj;
}

Answer 1

问题解决了，address标签太小，所以我在if循环中再次调用[address sizeToFit]：

        if (address.text != NULL)
        {
            [address sizeToFit];
            [gps stopUpdatingLocation];
        }