Hello everyone! I'm getting the following error wh...

# multiplatform

[Jordi Saumell]

Hello everyone! I'm getting the following error when building the native library: kotlin super calls to objective-c protocols are not allowed. Has anyone encountered this/knows how to solve it? I'll add more details in the thread

[Jordi Saumell]

I have the following code, to obtain users'l locations:

internal class Tracker(
    private val onNewLocation: (Location) -> Unit,
) : NSObject(), CLLocationManagerDelegateProtocol {
    override fun locationManager(manager: CLLocationManager, didUpdateLocations: List<*>) {
        delegate.locationManager(manager, didUpdateLocations)
        (didUpdateLocations.last() as? CLLocation)?.let { location ->
            location.coordinate().useContents {
                onNewLocation(Location(latitude, longitude))
            }
        }
    }
}

[Jordi Saumell]

If I don't extend from NSObject, it tells me I have to, so that does not seem to be an option.
I've found a workaround that compiles, but it has 2 issues:
• It requires boilerplate
• It gives me several warnings I do not understand, and I don't know its impact
The solution is to receive an instance of a class and delegate to it, instead of extending from NSObject:
`
``

internal class Tracker(
    private val onNewLocation: (Location) -> Unit,
    private val delegate: LocationManagerDelegate = LocationManagerDelegate(),
) : CLLocationManagerDelegateProtocol by delegate {
    override fun locationManager(manager: CLLocationManager, didUpdateLocations: List<*>) {
        delegate.locationManager(manager, didUpdateLocations)
        (didUpdateLocations.last() as? CLLocation)?.let { location ->
            location.coordinate().useContents {
                onNewLocation(Location(latitude, longitude))
            }
        }
    }
}

class LocationManagerDelegate(): NSObject(), CLLocationManagerDelegateProtocol

[Jordi Saumell]

With this solution, I get the wasning Delegated member 'fun locationManager(manager: CLLocationManager, didEnterRegion: CLRegion): Unit' hides supertype override: public open expect fun locationManager(manager: CLLocationManager, didEnterRegion: CLRegion): Unit defined in platform.CoreLocation.CLLocationManagerDelegateProtocol. Please specify proper override explicitly for each of the methods that are being delegated.

[Jordi Saumell]

So in summary:
• Is there a better solution?
• And what's the issue with hiding the supertype override? using delegates is a common pattern in Kotlin