如何获取用户当前的城市名称？

Question

您如何检索用户的当前城市名称？

Answer 1

您需要做的是设置一个CLLocationManager可以找到您当前坐标的坐标。使用当前坐标，您需要使用它MKReverseGeoCoder来找到您的位置。

- (void)viewDidLoad 

{  

    // this creates the CCLocationManager that will find your current location

    CLLocationManager *locationManager = [[[CLLocationManager alloc] init] autorelease];

    locationManager.delegate = self;

    locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;

    [locationManager startUpdatingLocation];

}

// this delegate is called when the app successfully finds your current location

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation 

{

    // this creates a MKReverseGeocoder to find a placemark using the found coordinates

    MKReverseGeocoder *geoCoder = [[MKReverseGeocoder alloc] initWithCoordinate:newLocation.coordinate];

    geoCoder.delegate = self;

    [geoCoder start];

}

// this delegate method is called if an error occurs in locating your current location

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error 

{

 NSLog(@"locationManager:%@ didFailWithError:%@", manager, error);

}

// this delegate is called when the reverseGeocoder finds a placemark

- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark

{

    MKPlacemark * myPlacemark = placemark;

    // with the placemark you can now retrieve the city name

    NSString *city = [myPlacemark.addressDictionary objectForKey:(NSString*) kABPersonAddressCityKey];

}

// this delegate is called when the reversegeocoder fails to find a placemark

- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error

{

    NSLog(@"reverseGeocoder:%@ didFailWithError:%@", geocoder, error);

}

Answer 2

从iOS 5开始MKReverseGeoCoder不推荐使用！

因此，您想使用CLGeocoderwith CLLocationManager，非常简单，并且可以使用block。

例：

- (void)locationManager:(CLLocationManager *)manager

    didUpdateToLocation:(CLLocation *)newLocation

           fromLocation:(CLLocation *)oldLocation

{

   [self.locationManager stopUpdatingLocation];

   CLGeocoder * geoCoder = [[CLGeocoder alloc] init];

    [geoCoder reverseGeocodeLocation:newLocation

                   completionHandler:^(NSArray *placemarks, NSError *error) {

                       for (CLPlacemark *placemark in placemarks) {

                           .... = [placemark locality];

                       }

                   }];

}

编辑：除了for in循环，您还可以执行以下操作：

NSString *locString = placemarks.count ? [placemarks.firstObject locality] : @"Not Found";