我想用罗盘来更新航向。但是我的didUpdateHeading没有调用。我是iOS的新手。请帮助任何帮助将不胜感激。@interfaceViewController:UIViewController@property(nonatomic,retain)CLLocationManager*locationManager;locationManager=[[CLLocationManageralloc]init];locationManager.desiredAccuracy=kCLLocationAccuracyBest;locationManager.delegate=self;//S