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";