//ViewController.m

import "ViewController.h"

import <MapKit/MapKit.h>

import <CoreLocation/CoreLocation.h>

@interface ViewController ()<CLLocationManagerDelegate,MKMapViewDelegate>
{
//定义变量地图视图、定位管理对象、地图解析对象
MKMapView *mv;
CLLocationManager *manager;
CLGeocoder *geo;
}
@end

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];
  //初始化地图视图
  mv = [[MKMapView alloc]initWithFrame:self.view.bounds];
  mv.mapType = MKMapTypeStandard;
  mv.zoomEnabled = YES;
  mv.rotateEnabled = YES;
  mv.scrollEnabled = YES;
  mv.showsUserLocation = YES;
  [self.view addSubview:mv];
  //定位
  CLLocationCoordinate2D center = {34,101};
  MKCoordinateSpan span = {0.01,0.01};
  MKCoordinateRegion region = {center,span};
  [mv setRegion:region animated:YES];
  //初始化定位管理器
  manager = [[CLLocationManager alloc]init];
  [manager requestWhenInUseAuthorization];
  manager.delegate = self;
  manager.desiredAccuracy = kCLLocationAccuracyBest;
  manager.distanceFilter = kCLDistanceFilterNone;
  [manager startUpdatingLocation];
  //初始化地址解析对象
  geo = [[CLGeocoder alloc]init];
  }

//定位更新响应方法

• (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations
  {
  //获取当前位置
  CLLocation *loc = [locations lastObject];
  //定位
  CLLocationCoordinate2D center = {loc.coordinate.latitude,loc.coordinate.longitude};
  MKCoordinateSpan span = {0.01,0.01};
  MKCoordinateRegion region = {center,span};
  [mv setRegion:region animated:YES];
  NSMutableString *mSt = [NSMutableString string];
  //反向解析经纬度获取地址
  [geo reverseGeocodeLocation:loc completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
  CLPlacemark *pla = [placemarks firstObject];

    NSArray *arr = [pla.addressDictionary objectForKey:@"FormattedAddressLines"];
    //拼接地址
    for (NSString *str in arr) {
        [mSt appendString:str];
    }
    //添加锚点
    MKPointAnnotation *anno = [[MKPointAnnotation alloc]init];
    anno.coordinate = center;
    anno.title = @"我的位置";
    anno.subtitle = mSt;
    [mv addAnnotation:anno];
  

  }];
  }

• (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
  {
  CLLocationCoordinate2D loc = [userLocation coordinate];
  //放大地图到自身的经纬度位置。
  MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(loc, 250, 250);
  [mv setRegion:region animated:YES];
  }

• (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
  {
  static NSString *cellid = @"cellid";
  MKAnnotationView *anno = [mapView dequeueReusableAnnotationViewWithIdentifier:cellid];
  if (!anno) {
  anno = [[MKAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:cellid];
  }
  anno.canShowCallout = YES;
  return anno;
  }