#import "ThreeViewController.h"

//引入定位头文件
#import <CoreLocation/CoreLocation.h>

//遵循定位管理器协议
@interface ThreeViewController ()<CLLocationManagerDelegate>

//声明位置管理器 属性
@property (strong, nonatomic)CLLocationManager *locationManager;
@end

@implementation ThreeViewController

- (void)viewDidLoad {
    [super viewDidLoad];
  
    //初始化位置管理器
    self.locationManager = [[CLLocationManager alloc] init];
    
    //判断是否打开定位服务
    if (![CLLocationManager locationServicesEnabled]) {
        
        NSLog(@"定位服务, 尚未打开, 请打开");
    }
    
    
    
    //如果没有授权定位服务, 则请求用户授权
    if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusNotDetermined) {
        
        /*如果定位服务没有被授权, 则请求用户授权,需要子啊 info.plist 文件中添加如下字段:
         
         NSLocationWhenInUseUsageDescription  YES
         NSLocationAlwaysUsageDescription  YES
         
         如果两个同时添加, 则默认为第一个. 但如果只添加了第二个, 则:
         */
        
        [self.locationManager requestAlwaysAuthorization];
    }
    //如果被授权
    else if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusAuthorizedAlways){
        
        //设置代理
        self.locationManager.delegate = self;
        
        //定位精度
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
        //kCLLocationAccuracyBest;  最精确
        //kCLLocationAccuracyNearestTenMeters;  10米误差
        //kCLLocationAccuracyHundredMeters;     百米误差
        //kCLLocationAccuracyKilometer;         千米误差
        //kCLLocationAccuracyThreeKilometers;   三千米误差
        
        
        //定位频率(几次/米)
        CLLocationDistance distance = 10.0;//每隔十米定位一次
        
        self.locationManager.distanceFilter = distance;
        
        
        //启动定位服务
        [self.locationManager startUpdatingLocation];
        
        
    }
    
}

@end```