This works for me: to rotate a Direction Arrow to particular location
-(void)viewDidLoad
{
[super viewDidLoad];
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.distanceFilter = kCLDistanceFilterNone;
}
-(void) calculateUserAngle:(CLLocationCoordinate2D)current {
double x = 0, y = 0 , deg = 0,delLon = 0;
delLon = fixLon - current.longitude;
y = sin(delLon) * cos(fixLat);
x = cos(current.latitude) * sin(fixLat) - sin(current.latitude) * cos(fixLat) * cos(delLon);
deg = RADIANS_TO_DEGREES(atan2(y, x));
if(deg<0){
deg = -deg;
} else {
deg = 360 - deg;
}
degrees = deg;
}
-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
CLLocationCoordinate2D here = newLocation.coordinate;
[self calculateUserAngle:here];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading
{
arrow.transform = CGAffineTransformMakeRotation((degrees-newHeading.trueHeading) * M_PI / 180);
}