Objective-C：如何從定位服務中找到航向（方向）？

Question

我正在從事定位服務，並且希望從定位服務中獲得航向，我擁有所有所需的屬性，例如緯度，經度等，但是我也想找到方向（航向）

 (void)locationUpdate:(CLLocation *)location {
    locationLable.text = [location description];
    CLLocationCoordinate2D coordinate = [location coordinate];
    NSLog(@"This is location   %@",[location description]);
    NSLog(@"Lattitude          =   %@",[NSString stringWithFormat:@"%f", coordinate.latitude]);
    NSLog(@"Langitude          =   %@",[NSString stringWithFormat:@"%f", coordinate.longitude]);
    NSLog(@"Altitude           =   %@",[NSString stringWithFormat:@"%gm", location.altitude]);
    NSLog(@"horizontalAccuracy =   %@",[NSString stringWithFormat:@"%gm", location.horizontalAccuracy]);
    NSLog(@"verticalAccuracy   =   %@",[NSString stringWithFormat:@"%gm", location.verticalAccuracy]);
    NSLog(@"Speed   =   %@",[NSString stringWithFormat:@"%gm", location.speed]);

}


- (void)headingUpdate:(CLHeading *)heading {
    NSLog(@"This is heading   %@",[heading description]);

}

- (void)viewDidLoad {
    locationController = [[MyCLController alloc] init];
    locationController.delegate = self;
    [locationController.locationManager startUpdatingLocation];
    [locationController.locationManager startUpdatingHeading];
}

我找到了一些從CLHeading獲取它的線索，但仍然無法從CLHeading獲取它。 我正在使用上面的代碼

Answer 1

閱讀http://developer.apple.com/library/ios/#DOCUMENTATION/CoreLocation/Reference/CLHeading_Class/Reference/Reference.html :)我想您應該使用trueHeading。

trueHeading

相對於真北的航向（以度為單位）。 （只讀）@property（只讀，非原子）CLLocationDirection trueHeading