#import <CoreLocation/CoreLocation.h>

.h文件中

@property (nonatomic,strong) CLLocationManager * manager;
@property (nonatomic,assign) BOOL isLocationed;

.m文件中

-(CLLocationManager *)manager{
    if (!_manager) {
        _manager = [[CLLocationManager alloc]init];
        _manager.delegate = self;
        _manager.desiredAccuracy = kCLLocationAccuracyBest;
    }
    return _manager;
}
- (void)findLocationCity{
    
    if ([CLLocationManager locationServicesEnabled]) {
        if ([self.manager respondsToSelector:@selector(requestWhenInUseAuthorization)]) {
            [self.manager requestWhenInUseAuthorization];
        }
        [self.manager startUpdatingLocation];
    }else{
        NSLog(@"提醒用户：定位服务未开启，可在设置中进行修改....");
    }
}
#pragma mark
#pragma mark - 获取 GPS 经度和纬度
- (void)locationManager:(CLLocationManager *)manager
     didUpdateLocations:(NSArray<CLLocation *> *)locations{
    
    if (!_isLocationed) {
        
        CLLocation * location1 = [locations lastObject];
        CLLocationCoordinate2D coordinate = location1.coordinate;
        CLGeocoder * geocoder = [[CLGeocoder alloc]init];
        CLLocation * location = [[CLLocation alloc]initWithLatitude:coordinate.latitude longitude:coordinate.longitude];
        [geocoder reverseGeocodeLocation:location completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
            if (placemarks.count > 0) {
                CLPlacemark * placemark = [placemarks objectAtIndex:0];
                
                NSString * city = placemark.locality;
                
                if (!city) {
                    city = placemark.administrativeArea;
                }
                
                UIAlertController * ac = [UIAlertController alertControllerWithTitle:@"切换当前城市:" message:city preferredStyle:UIAlertControllerStyleAlert];
                
                UIAlertAction * aa = [UIAlertAction actionWithTitle:@"确认" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                    
                    [WeatherView_Model weatherWithCurrentCity:city finishBlock:^(WeatherView_Model *weatherModel) {
                        self.weather_View.weatherModel = weatherModel;
                    } errorBlock:^{
                    }];
                }];
                [ac addAction:aa];
                
                UIAlertAction * aa2 = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
                [ac addAction:aa2];
                
                [self presentViewController:ac animated:YES completion:nil];
                
            }else if (error == nil && placemarks.count == 0){
                NSLog(@"No results were returned.");
            }else if (error != nil){
                NSLog(@"An error occurred = %@", error);
            }
        }];
        
        self.isLocationed = YES;
    }
    [self.manager stopUpdatingLocation];
}
#pragma mark
#pragma mark - 定位失败返回
- (void)locationManager:(CLLocationManager *)manager
       didFailWithError:(NSError *)error{
    if (error.code == kCLErrorDenied) {
        NSLog(@"Error : %@",error);
    }
}