一、有两个文件，一个是显示地图的MapViewController ，另一个是MapLocation.h地图标点类 ，用来实现 MKAnnotation 协议

二、MapViewController

import "MapViewController.h"

import <CoreLocation/CoreLocation.h>

import <MapKit/MapKit.h>

import "MapLocation.h"

@interface MapViewController ()<MKMapViewDelegate,CLLocationManagerDelegate>{
CLLocationManager *_manager;
}
@property (nonatomic,strong)MKMapView *mapView;
@end

@implementation MapViewController

• (void)viewDidLoad {
  [super viewDidLoad];

  [self navTitle:@"地图"];
  self.view.backgroundColor = [UIColor whiteColor];

  [self initMapView];

}

• (void)initMapView {

  _manager = [[CLLocationManager alloc]init];
  _manager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
  if ([[UIDevice currentDevice].systemVersion floatValue]>8.0) {
  [_manager requestWhenInUseAuthorization];
  }
  [_manager startUpdatingLocation];

//创建地图
_mapView = [[MKMapView alloc]initWithFrame:[UIScreen mainScreen].bounds];
_mapView.showsUserLocation = NO;
_mapView.delegate =self;    
[self.view addSubview:_mapView];

}

• (void)setLocationName:(NSString *)locationName{
  _locationName = locationName;
  //根据位置获取经纬度
  if (_locationName == nil || [_locationName length] == 0) {
  return ;
  }

  CLGeocoder *geocode = [[CLGeocoder alloc] init];

  [geocode geocodeAddressString:_locationName completionHandler:^(NSArray *placemarks, NSError *error) {

    if ([placemarks count ] > 0) {
        [_mapView removeAnnotations:_mapView.annotations];
    }
    
    for (int i = 0; i< [placemarks count]; i++) {
        CLPlacemark * placemark = placemarks[i];
        
        //调整地图位置和缩放比例,第一个参数是目标区域的中心点，第二个参数：目标区域南北的跨度，第三个参数：目标区域的东西跨度，单位都是米
        MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(placemark.location.coordinate, 10000, 10000);
        
        //重新设置地图视图的显示区域
        [_mapView setRegion:viewRegion animated:YES];
        // 实例化 MapLocation 对象
        MapLocation * annotation = [[MapLocation alloc] init];
        annotation.streetAddress = placemark.thoroughfare ;
        annotation.city = placemark.locality;
        annotation.state = placemark.administrativeArea ;
        annotation.zip = placemark.postalCode;
        annotation.coordinate = placemark.location.coordinate;
        
        //把标注点MapLocation 对象添加到地图视图上，一旦该方法被调用，地图视图委托方法mapView：ViewForAnnotation:就会被回调
        [_mapView addAnnotation:annotation];
    }
  

  }];
  }

三、
mapLocation.h 代码如下：

import <Foundation/Foundation.h>

import <MapKit/MapKit.h>

@interface mapLocation : NSObject<MKAnnotation>
// 地图标点类必须实现 MKAnnotation 协议
// 地理坐标
@property (nonatomic ,readwrite) CLLocationCoordinate2D coordinate ;

//街道属性信息
@property (nonatomic , copy) NSString * streetAddress ;

// 城市信息属性
@property (nonatomic ,copy) NSString * city ;

// 州，省 市 信息

@property(nonatomic ,copy ) NSString * state ;
//邮编
@property (nonatomic ,copy) NSString * zip ;

@end

mapLocation.m 文件如下：

import "mapLocation.h"

@implementation mapLocation

pragma mark 标点上的主标题

• (NSString *)title{
  return @"您的位置!";
  }

pragma mark 标点上的副标题

• (NSString *)subtitle{
  NSMutableString *ret = [NSMutableString new];
  if (_state) {
  [ret appendString:_state];
  }
  if (_city) {
  [ret appendString:_city];
  }
  if (_city && _state) {
  [ret appendString:@", "];
  }
  if (_streetAddress && (_city || _state || _zip)) {
  [ret appendString:@" · "];
  }
  if (_streetAddress) {
  [ret appendString:_streetAddress];
  }
  if (_zip) {
  [ret appendFormat:@", %@",_zip];
  }
  return ret;
  }

@end