openParentApplication

InterfaceController.swift

    @IBAction func buttonAction() {
        let dictionary = ["message": "Hi, apple watch here!"]
        WKInterfaceController.openParentApplication(dictionary) {
            (replyInfo, error) -> Void in
            
            let reply = replyInfo["event"] as! NSData // take our encoded event from dictionary
            
            NSKeyedUnarchiver.setClass(Event.self, forClassName: "Event") // We are not using original class anymore, so we have to do it
            let event = NSKeyedUnarchiver.unarchiveObjectWithData(reply) // decode the event
        }
    }