iOS 根据经纬度获取地名，根据地名获取经纬度

1. 根据经纬度获取地名

 CLGeocoder *clGeoCoder = [[CLGeocoder alloc] init];
 [clGeoCoder reverseGeocodeLocation:newLocation completionHandler: ^(NSArray *placemarks,NSError *error) {
      for (CLPlacemark *placeMark in placemarks)
      {
          NSDictionary *addressDic=placeMark.addressDictionary;

          NSString *state=[addressDic objectForKey:@"State"];
          NSString *city=[addressDic objectForKey:@"City"];
          NSString *subLocality=[addressDic objectForKey:@"SubLocality"];
          NSString *street=[addressDic objectForKey:@"Street"];

          [self stopLocation];
          [_chooseCityBtn setTitle:city forState:UIControlStateNormal];
          [_activityIndicator stopAnimating];
      }

  }];

2. 根据地名获取经纬度

 NSString *oreillyAddress = @"1005 Gravenstein Highway North, Sebastopol, CA 95472, USA";
 CLGeocoder *myGeocoder = [[CLGeocoder alloc] init];
 [myGeocoder geocodeAddressString:oreillyAddress completionHandler:^(NSArray *placemarks, NSError *error) {
     if ([placemarks count] > 0 && error == nil) {
         NSLog(@"Found %lu placemark(s).", (unsigned long)[placemarks count]);
         CLPlacemark *firstPlacemark = [placemarks objectAtIndex:0];
         NSLog(@"Longitude = %f", firstPlacemark.location.coordinate.longitude);
         NSLog(@"Latitude = %f", firstPlacemark.location.coordinate.latitude);
     }
     else if ([placemarks count] == 0 && error == nil) {
         NSLog(@"Found no placemarks.");
     } else if (error != nil) {
         NSLog(@"An error occurred = %@", error);
     }
 }];