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Editorial Team
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Asked: 2026-05-11T22:27:46+00:00

I’m relatively new to Objective-C and really don’t know much about it yet, so

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I’m relatively new to Objective-C and really don’t know much about it yet, so I apologise for what is probably a really amateurish question.

I’m trying to get the magnetic heading from CLHeading and CLLocationDirection. However I’m getting compile errors for this line of code:

locationLabel.text = [[[location course] magneticHeading] stringValue];

The errors are:

warning: invalid receiver type 'CLLocationDirection'  
error: cannot convert to a pointer type

I don’t really understand what I’m doing wrong here. Please help!

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1 Answer

  1. Editorial Team

    Here are the steps needed to use the compass.

    1) check the availability: if the headingAvailable property of the location manager is YES, then you can use the compass.

    2) use the location manager method -(void) startUpdatingHeading to begin receiving the information you are searching for

    3) actually retrieve this information using the delegate method (do not forget to set yourself as the delegate)

     - (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading

    Hope this helps.

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