iOS定位服务 CoreLocation

// 在iOS中，定位服务API主要使用CoreLocation框架，
/*
    CLLocationManager 用于定位服务管理类，它能够给我们提供位置信息和高度信息，也可以监控设备进入或离开某个区域，还可以或得设备的运行方向等。
    CLLocationManagerDelegate CLLocationManager 类的委托协议。
    CLLocation 改类封装了位置和高度信息

 打开定位服务：设置->隐私->定位服务->XX 应用
 */

// 1、导入CoreLocation 框架
#import <CoreLocation/CoreLocation.h>

// 2、遵守 协议
@interface OnePositionViewController ()<CLLocationManagerDelegate>
{
    // 3、定义了CLLocationManager 属性
    CLLocationManager *_manager;
    CLGeocoder *_geocoder;

}

@property (nonatomic,strong)CLGeocoder *geocoder;
@property (weak, nonatomic) IBOutlet UILabel *latLabel;
@property (weak, nonatomic) IBOutlet UILabel *lngLabel;
@property (weak, nonatomic) IBOutlet UILabel *altLabel;
@property (weak, nonatomic) IBOutlet UILabel *locationLabel;

@end

@implementation OnePositionViewController


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

    return _geocoder;

}

- (void)viewDidLoad {
    [super viewDidLoad];

    self.title = @"地理定位和地理信息反编码";

    if (![CLLocationManager locationServicesEnabled]) {
        NSLog(@"用户关闭了定位");

        return;
    }
    // 创建并初始化locationManager 属性，
    _manager = [[CLLocationManager alloc] init];

    _manager.delegate = self;

    // 精确度  精确度越高，请求获得位置信息的时间就越短，设备越耗电
    /*
     kCLLocationAccuracyBestForNavigation   导航情况下最高的精确度，一般有外接电源时才能使用 （车载导航）
     kCLLocationAccuracyBest;               设备使用电池供应时最高的精确度。
     kCLLocationAccuracyNearestTenMeters;   精确到10米
     kCLLocationAccuracyHundredMeters;      精确到100米 （徒步旅行者的应用）
     kCLLocationAccuracyKilometer;          精确到1000米
     kCLLocationAccuracyThreeKilometers;    精确到3000米
     */
    _manager.desiredAccuracy = kCLLocationAccuracyBest;

    // 设置距离过滤器，定义了设备移动后获得位置信息的最小距离。单位是米
    _manager.distanceFilter = 1000.0f;

    // 弹出用户授权提示框  修改工程配置文件   NSLocationAlwaysUsageDescription 和 NSLocationWhenInUseUsageDescription.
    if ([_manager respondsToSelector:@selector(requestWhenInUseAuthorization)]) {
        [_manager requestAlwaysAuthorization];
    }
    // 开始定位，也可以放在 viewWillAppear 中调用，在
    [_manager startUpdatingLocation];


}

//- (void)viewWillAppear:(BOOL)animated{
//    [super viewWillAppear:animated];
//    
//    // 开始定位
//    [_manager startUpdatingLocation];
//}
//
//- (void)viewWillDisappear:(BOOL)animated{
//    [super viewDidAppear:animated];
//    // 停止定位
//    [_manager stopUpdatingLocation];
//}

#pragma mark -------- 授权状态发生变化时调用
- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {
    switch (status) {

        case kCLAuthorizationStatusNotDetermined:

            if ([manager respondsToSelector:@selector(requestAlwaysAuthorization)]) {

                [manager requestWhenInUseAuthorization];
            }

            break;
        default:
            break;
    }
}

#pragma mark - ------------ 定位成功
- (void)locationManager:(CLLocationManager *)manager
     didUpdateLocations:(NSArray<CLLocation *> *)locations{

//    NSLog(@"locations = %@",locations);

    CLLocation *location = locations.lastObject;

    NSLog(@"经度：%f",location.coordinate.latitude);
    NSLog(@"纬度：%f",location.coordinate.longitude);
    NSLog(@"高度：%f",location.altitude);

    self.latLabel.text = [NSString stringWithFormat:@"经度：%f",location.coordinate.latitude];
    self.lngLabel.text = [NSString stringWithFormat:@"纬度：%f",location.coordinate.longitude];
    self.altLabel.text = [NSString stringWithFormat:@"高度：%f",location.altitude];
    //    location.coordinate.latitude
    //    location.coordinate.longitude

    //根据经纬度解析地理位置

    [self.geocoder reverseGeocodeLocation:location completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
        if (!error) {
            CLPlacemark *placemark = placemarks[0];
                        NSLog(@"address = %@",placemark.addressDictionary);

            NSDictionary *addressDictionary = placemark.addressDictionary;
            // 国家
            NSString *address = addressDictionary[@"Country"];
            // 省份
            NSString *addressState = addressDictionary[@"State"];
            // 城市
            NSString *addressCity = addressDictionary[@"City"];
            // 区域
            NSString *addressSubLocality = addressDictionary[@"SubLocality"];
            // 街道
            NSString *addressThoroughfare = addressDictionary[@"Thoroughfare"];

            self.locationLabel.text = [NSString stringWithFormat:@"%@ %@ %@ %@ %@",address,addressState,addressCity,addressSubLocality,addressThoroughfare];
//            
//            for (NSString *key in placemark.addressDictionary.allKeys) {
//                NSLog(@"%@:%@",key,placemark.addressDictionary[key]);
//            }

            [_manager stopUpdatingLocation];
        }else{
            NSLog(@"error:%@",error);
        }

    }];
}

#pragma mark ------- 定位失败
- (void)locationManager:(CLLocationManager *)manager
       didFailWithError:(NSError *)error{
    NSLog(@"error :%@",error);

}