CLLocationManager-heading不适用于iPhone 6s和6s Plus

Question

我正在尝试接收iPhone的标题（手机指向的方向）。

我正在尝试下面的代码，

- (void)startHeadingEvents {
   if (!self.locManager) {
      CLLocationManager* theManager = [[[CLLocationManager alloc] init] autorelease];

      // Retain the object in a property.
      self.locManager = theManager;
      locManager.delegate = self;
   }

   // Start location services to get the true heading.
   locManager.distanceFilter = 1000;
   locManager.desiredAccuracy = kCLLocationAccuracyKilometer;
   [locManager startUpdatingLocation];

   // Start heading updates.
   if ([CLLocationManager headingAvailable]) {
      locManager.headingFilter = 5;
      [locManager startUpdatingHeading];
   }
}

- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:    (CLHeading *)newHeading {
   if (newHeading.headingAccuracy < 0)
      return;

   // Use the true heading if it is valid.
   CLLocationDirection  theHeading = ((newHeading.trueHeading > 0) ?
        newHeading.trueHeading : newHeading.magneticHeading);

   self.currentHeading = theHeading;
   [self updateHeadingDisplays];
}  

它类似于Apple的iOS开发人员库和编程指南。 代码总是返回0到10或355到359之间的标题度。我没有得到它们之间的值。

更多，我只在iPhone 6S和iPhone 6S plus上遇到此问题。否则，这完全适用于iPhone 4S，5,5S，6,6 Plus。我的所有手机都在使用最新的iOS。