地理编码与反地理编码

最新推荐文章于 2018-07-08 15:58:22 发布

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最新推荐文章于 2018-07-08 15:58:22 发布

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分类专栏： iOS学习随记文章标签：定位地理编码

本文链接：https://blog.youkuaiyun.com/u010606986/article/details/44589577

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本文介绍了一个iOS应用如何实现定位服务，包括创建CLLocationManager实例、请求定位权限、设置定位精度及频率，并通过CLLocationManagerDelegate方法获取并处理定位数据。

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//
//  CoreLocationViewController.m
//  CoreLocation
//
//  Created by xiaoyao on 15/3/23.
//  Copyright (c) 2015年 lije. All rights reserved.
//

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

@interface CoreLocationViewController () <CLLocationManagerDelegate> {
  CLLocationManager *_locationManager;
  CLGeocoder *_geocoder;
}
@end

@implementation CoreLocationViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  
  // 创建定位管理器对象
  _locationManager = [[CLLocationManager alloc] init];
  
  if (![_locationManager locationServicesEnabled]) {
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示"
                                                        message:@"是否允许启动定位服务"
                                                       delegate:nil
                                              cancelButtonTitle:@"取消"
                                              otherButtonTitles:@"确定", nil];
    [alertView show];
  }
  
  // 如果定位服务状态未授权的话进行授权
  if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusNotDetermined) {
    [_locationManager requestWhenInUseAuthorization];
  } else if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusAuthorizedWhenInUse ||
             [CLLocationManager authorizationStatus] == kCLAuthorizationStatusAuthorizedAlways){
    // 设为使用应用程序的时候进行定位状态
    _locationManager.delegate = self;
    // 定位精度
    _locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    // 定位频率
    CLLocationDistance distance = 10.0f;
    _locationManager.distanceFilter = distance;
    // 开始追踪定位
    [_locationManager startUpdatingLocation];
  } else {
    NSLog(@"尚未开启定位服务");
  }
}

- (void)viewWillAppear:(BOOL)animated {
  [super viewWillAppear:animated];
  
  [_locationManager stopUpdatingLocation];
}

#pragma mark - CLLocationManagerDelegate
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
  for (int i = 0; i < locations.count; i++) {
    CLLocation *loction = [locations objectAtIndex:i];
    CLLocationCoordinate2D coor = loction.coordinate;
    NSLog(@"经度= %f, 纬度= %f, 海拔= %f, 航向=%f,行走速度=%f",coor.longitude,coor.latitude,loction.altitude,loction.course,
          loction.speed);
    
    [self getAddressByLocation:loction];
  }
  
  // 如果不需要时时定位，则定位一次完成关闭定位
  [_locationManager stopUpdatingLocation];
}

// 根据地理位置得到地理名称
- (void)getAddressByLocation:(CLLocation *)loction {
  [_geocoder reverseGeocodeLocation:loction completionHandler:^(NSArray *placemarks, NSError *error) {
    CLPlacemark *place = [placemarks firstObject];
    NSDictionary *dict = place.addressDictionary;
    [self getCoordinateByAddress:dict];
    NSLog(@"%@", dict);
  }];
}

// 根据地理坐标得到地理名称
- (void)getCoordinateByAddress:(NSDictionary *)addressDict {
  [_geocoder geocodeAddressDictionary:addressDict completionHandler:^(NSArray *placemarks, NSError *error) {
    CLPlacemark *place = [placemarks firstObject];
    CLLocation *loction = place.location;
    CLRegion *region = place.region;
    NSLog(@"%@%@",loction, region);
  }];
}
@end