iOS 11：iPhone 8plus中未收到位置更新

Question

位置更新在所有其他设备上都运行正常，但在iPhone 8 plus中无效

以下是我正在使用的简单代码

 _locationManager = [[CLLocationManager alloc] init];
 _locationManager.delegate = self;
 _locationManager.desiredAccuracy = kCLLocationAccuracyBest;
 _locationManager.distanceFilter = kCLDistanceFilterNone;
  [_locationManager requestAlwaysAuthorization];
 _locationManager.allowsBackgroundLocationUpdates = YES;
 _locationManager.pausesLocationUpdatesAutomatically = NO;
  [_locationManager startUpdatingLocation];