求助啊，IOS怎么通过百度地图来获取城市名的编号

高德导航

//获取经纬度地理信息
CLGeocoder *Geocoder=[[CLGeocoder alloc]init];
CLGeocodeCompletionHandler handler =^(NSArray *place, NSError *error) {
for (CLPlacemark *placemark in place)
{
NSLog(@"定位==%@,%@,%@,%@,%@,%@",placemark.administrativeArea,placemark.locality,placemark.subLocality,placemark.thoroughfare,placemark.subThoroughfare,placemark.name);
}
//不知其作用 -_-!!!
CLLocation *loc = [[CLLocation alloc]initWithLatitude:self.userLat longitude:self.userlon];
[Geocoder reverseGeocodeLocation:loc completionHandler:handler];

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答：高德导航