Question

I having some problem on the iPhone/iPad compass development.

The trueHeading taken from the CLHeading alway give me the ‘-1’ value, I’m stuck here. Here is my code:

self.locationManager = [[[CLLocationManager alloc] init] autorelease];
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
self.locationManager.delegate = self;
self.locationManager.headingFilter = 0.5; //1 degrees
[self.locationManager startUpdatingHeading];

I also found out something, that is when I on the map app or the compass app which has use the location stuff, the trueHeading value suddenly read correct. I wonder what is the cause, any idea? It happen on both iPhone4 and on the iPad.

It also happen whenever I off the Location Services in settings and re-enable it, it will become unable to read the correct trueHeading value, i wonder because the location services cannot be enable by the app I creating?

anyway, thank in advance

—My Solution—

see below.

Answer 1

—My Solution—

What I did was, add in the [self.locationManager startUpdatingLocation] to before or after the [self.locationManager startUpdatingHeading]; (when Location Services is off & re-enable from the Settings). I’m not sure this is a good solution, but this is what I did to make it work, if you have any better solution please share.