Getting magneticHeading value

Can I get the magnetic heading value on the following delegate? If so, how can I get it into a UILabel?

- (void)locationManager:(CLLo开发者_开发知识库cationManager *)manager didUpdateHeading:(CLHeading *)newHeading {

}

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Yup:

- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading {
    myLabel.text = [NSString stringWithFormat:@"%f", [newHeading magneticHeading]];
}