Question

我正在尝试让我的应用以类似地址的形式（位于“反向地理编码”评论之后）找到用户的位置。以下是我的代码：

- (IBAction)getuserlocation:(id) sender{
    //Getting Location
    locationManager.delegate = self;
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;

    [locationManager startUpdatingLocation];
    NSLog(address);
}
#pragma mark - CLLocationManagerDelegate

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
    NSLog(@"didFailWithError: %@", error);
    UIAlertView *errorAlert = [[UIAlertView alloc]
                               initWithTitle:@"Error" message:@"Failed to Get Your Location" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [errorAlert show];
}

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

    if (currentLocation != nil) {
        longitude = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.longitude];
        latitude = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.latitude];
    }

    // Stop Location Manager
    [locationManager stopUpdatingLocation];

    // Reverse Geocoding
    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 = [NSString stringWithFormat:@"%@ %@\n%@ %@\n%@\n%@",
                                 placemark.subThoroughfare, placemark.thoroughfare,
                                 placemark.postalCode, placemark.locality,
                                 placemark.administrativeArea,
                                 placemark.country];
        } else {
            NSLog(@"%@", error.debugDescription);
        }
    } ];

}

我的问题是编译器只打印出“（null）”。（我这样做的行位于“getuserlocation”IBAction。）我不知道为什么会这样。我在实际的iPhone 6 Plus上测试了应用程序，它与模拟器不同，可以访问位置服务。

如果有人能够指出我的代码中的错误/问题在哪里，导致它打印出null，我将非常感激。提前感谢所有回复的人。

*** BTW：我的viewDidLoad部分包含以下几行： locationManager = [[CLLocationManager alloc] init]; geocoder = [[CLGeocoder alloc] init];

Answer 1

您在获取位置并将其转换为地址之前很久就会记录address。

将NSLog(address);移至您实际为address指定值的位置之后。

顺便说一句 - 它应该更像是：NSLog(@"Address: %@, address);。

Objective-C：查找用户位置（不在地图上）

1 个答案: