CoreLocation.framework 要用到这个框架

import <CoreLocation/CoreLocation.h>

地图编码 是 向苹果发送一个地名 返回详细的地名

  #import "ViewController.h"
            #import <CoreLocation/CoreLocation.h>

            @interface ViewController ()

            /**
             *  地理编码对象
             */
            @property (nonatomic,strong) CLGeocoder * geocoder;

            @end

            @implementation ViewController

            - (void)viewDidLoad {
                [super viewDidLoad];
                // Do any additional setup after loading the view, typically from a nib.
                self.geocoder = [[CLGeocoder alloc] init];
                
                
                // 向苹果服务器发送网络请求，获取 "地名" 的详细信息
                //广州图书馆
                [self.geocoder geocodeAddressString:@"浸潭镇" completionHandler:^(NSArray *placemarks, NSError *error) {
                    //此block是在主线程调用
                    NSLog(@"%@",[NSThread currentThread]);
                    if (!error) {
                        // CLPlacemark 位置标记
                        for (CLPlacemark *placemark in placemarks) {
                            NSLog(@"成功 %@",[placemark class]);
                            
                            NSLog(@"地理名称%@",placemark.name);
                            NSLog(@"街道名%@",placemark.thoroughfare);
                            NSLog(@"国家%@",placemark.country);
                            NSLog(@"城市%@",placemark.locality);
                            NSLog(@"区: %@",placemark.subLocality);

                            NSLog(@"地址%@",placemark.addressDictionary);
                            NSLog(@"=======\n");
                        }
                    }else{
                        NSLog(@"%@",error);
                    }
                    
                }];
            }
   @end

反地理编码 是 向苹果发送一个经纬度 返回详细的地名
对象懒加载

import "ViewController.h"

        #import <CoreLocation/CoreLocation.h>

        @interface ViewController ()
        @property (nonatomic,strong) CLGeocoder * geocoder;
        @end



        @implementation ViewController


        -(CLGeocoder *)geocoder{
            if (!_geocoder) {
                _geocoder = [[CLGeocoder alloc] init];
            }
            
            return _geocoder;
        }

        - (void)viewDidLoad {
            [super viewDidLoad];
            // Do any additional setup after loading the view, typically from a nib.
            
            //反地理编码： 把 "经纬" 转化成详细的地理信息
            
            //广州花城广场: 经度 113.324675 纬度 23.124103
            CLLocation *loc = [[CLLocation alloc] initWithLatitude:23.124103 longitude:113.324675];
            
            
            [self.geocoder reverseGeocodeLocation:loc completionHandler:^(NSArray *placemarks, NSError *error) {
                //此block是在主线程调用
                NSLog(@"%@",[NSThread currentThread]);
                if (!error) {
                    // CLPlacemark 位置标记
                    for (CLPlacemark *placemark in placemarks) {
                        NSLog(@"成功 %@",[placemark class]);
                        
                        NSLog(@"地理名称%@",placemark.name);
                        NSLog(@"街道名%@",placemark.thoroughfare);
                        NSLog(@"国家%@",placemark.country);
                        NSLog(@"城市%@",placemark.locality);
                        NSLog(@"区: %@",placemark.subLocality);
                        
                        NSLog(@"地址%@",placemark.addressDictionary);
                        NSLog(@"=======\n");
                    }
                }else{
                    NSLog(@"%@",error);
                }
                
            }];
        }



        @end