ni_distance_direction.swift

extension CercaViewModel: NISessionDelegate
{
    ...
    
    func session(_ session: NISession, didUpdate nearbyObjects: [NINearbyObject]) -> Void
    {
        guard let nearbyObject = nearbyObjects.first else
        {
            return
        }
        
        self.distanceToPeer = nearbyObject.distance
        
        if let direction = nearbyObject.direction
        {
            
            self.isDirectionAvailable = true
            self.directionAngle = direction.x > 0.0 ? 90.0 : -90.0
        }
        else
        {
            self.isDirectionAvailable = false
        }
    }
    
    ...
}