retrieving heading information - iPhone

[adev]

Hello.

I have used phonegap for android now I am trying to use it for the
iPhone. I started modifying the location.m file to add heading in
there, but I can't seem to get it quite right. Has anyone added this,
if so, please share if you don't mind.


Here are the changes I made. Please let me know if you see something
way out of place. I am new to obj-c coding.

// --- start

- (void)start:(NSMutableArray*)arguments
withDict:(NSMutableDictionary*)options
{
if (__started == YES)
return;
if ([self.locationManager locationServicesEnabled] != YES)
return;

// Tell the location manager to start notifying us of location
updates
[self.locationManager startUpdatingLocation];
[self.locationManager startUpdatingHeading]; // <--
added to update heading
__started = YES;

if ([options objectForKey:@"distanceFilter"]) {
CLLocationDistance distanceFilter = [(NSString *)[options
objectForKey:@"distanceFilter"] doubleValue];
self.locationManager.distanceFilter = distanceFilter;
}

if ([options objectForKey:@"desiredAccuracy"]) {
int desiredAccuracy_num = [(NSString *)[options
objectForKey:@"desiredAccuracy"] integerValue];
CLLocationAccuracy desiredAccuracy = kCLLocationAccuracyBest;
if (desiredAccuracy_num < 10)
desiredAccuracy = kCLLocationAccuracyBest;
else if (desiredAccuracy_num < 100)
desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
else if (desiredAccuracy_num < 1000)
desiredAccuracy = kCLLocationAccuracyHundredMeters;
else if (desiredAccuracy_num < 3000)
desiredAccuracy = kCLLocationAccuracyKilometer;
else
desiredAccuracy = kCLLocationAccuracyThreeKilometers;

self.locationManager.desiredAccuracy = desiredAccuracy;
}
}

- (void)stop:(NSMutableArray*)arguments
withDict:(NSMutableDictionary*)options
{
if (__started == NO)
return;
if ([self.locationManager locationServicesEnabled] != YES)
return;

[self.locationManager stopUpdatingLocation];
[self.locationManager stopUpdatingHeading]; // <--
added to update/stop heading
__started = NO;
}


- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation
didUpdateHeading:(CLHeading *)newHeading // <-- get
heading
{
int epoch = [newLocation.timestamp timeIntervalSince1970];
float course = -1.0f;
float speed = -1.0f;

#ifdef __IPHONE_2_2
course = newLocation.course;
speed = newLocation.speed;
#endif
NSString* coords = [NSString stringWithFormat:@"coords: { latitude:
%f, longitude: %f, altitude: %f, heading: %f, speed: %f, accuracy:
{horizontal: %f, vertical: %f}, altitudeAccuracy: null, trueHeading:
%f}",
newLocation.coordinate.latitude,
newLocation.coordinate.longitude,
newLocation.altitude,
course,
speed,
newLocation.horizontalAccuracy,
newLocation.verticalAccuracy,
newHeading.trueHeading // <-- new heading param
];

NSString * jsCallBack = [NSString
stringWithFormat:@"navigator.geolocation.setLocation({ timestamp: %d,
%@ });", epoch, coords];
NSLog(@"%@", jsCallBack);

[webView stringByEvaluatingJavaScriptFromString:jsCallBack];
}


// --- end


I am wondering if I need to separate the location and the heading
updates.

I do have a 3GS with a developers license.

Thanks.
Mike