I'm trying to initialize var altitude.

init(altitude: CLLocationDistance)
    {
        self.altitude = altitude
        super.init(nibName: nil, bundle: nil)
    }

required init?(coder aDecoder: NSCoder)
    {
        super.init(coder: aDecoder)
    }

But it gives me an error: Property 'self.altitude' not initialized at super.init call

Thanks