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);
        }
    }];