首先导入CoreLocation.framework，然后再引入头文件#import

定义属性

@property (nonatomic , strong)CLLocationManager *locationManager;

初始化定位服务

#pragma mark - 私有方法
///初始化定位服务
- (void)settupLocation
{
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;
    self.locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;

    if ([CLLocationManager locationServicesEnabled] &&
        [CLLocationManager authorizationStatus] == kCLAuthorizationStatusAuthorizedWhenInUse) {
        //定位功能可用，开始定位
        [self.locationManager startUpdatingLocation];

    } else if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusNotDetermined) {
        //请求授权
        [self.locationManager requestWhenInUseAuthorization];

    } else if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusDenied
              || [CLLocationManager authorizationStatus] == kCLAuthorizationStatusRestricted){
    }
    if (self.schoolStr.length < 2) {
        // 开始定位
        [_locationManager startUpdatingLocation];
    }
}

然后使用代理 CLLocationManagerDelegate

#pragma mark - <CLLocationManagerDelegate>
///成功定位
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations
{
    //经纬度信息
    CLLocation *location = [locations lastObject];

    //反地理编码
    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
    [geocoder reverseGeocodeLocation:location completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
        //编码成功
        if (!error && placemarks.count > 0) {
            //获取地址对象
            CLPlacemark *address = placemarks.firstObject;
            //获取城市名称
            NSMutableString *city = [NSMutableString stringWithString:address.locality];
            if ([city containsString:@"市"]) {
                [city deleteCharactersInRange:[city rangeOfString: @"市"]];
            }
            //显示定位信息
            self.schoolStr = city;
            [self.tableView reloadData];
            //停止定位
            [self.locationManager stopUpdatingLocation];

        } else {
            //编码失败
        }
    }];
}

在Info.plist文件中添加如下配置：

（1）NSLocationAlwaysUsageDescription
（2）NSLocationWhenInUseUsageDescription