How to use 2 UIPickerView's in one View Controller with alamofire?

    var pickerViewCategory = UIPickerView()
    var pickerViewSubCategory = UIPickerView()

  // array 
var pickOption = ["Théâtre", "Danse", "Comédie musicale", "Opéra", "Cirque", "Exposition", "Dégustation", "Jeune public", "Concerts", "Arts de rue", "Cinéma", "Conférence", "Festival", "Visite guidée", "Atelier", "Expo-vente"]

private var _subCategoriesArray = [String]()

//viewDidLoad
 override func viewDidLoad() {
        super.viewDidLoad()
        pickerViewCategory.delegate = self
        pickerViewSubCategory.delegate = self
        self.pickerViewCategory.tag = 1
    }

// pickerview
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 1
    }
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        if self.pickerViewCategory.tag == 1 {
            return pickOption.count
        }else{
            return _subCategoriesArray.count  
        }  
    }

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        if self.pickerViewCategory.tag == 1 {
            return pickOption[row]  
        }else{
            return _subCategoriesArray[row]
        }
    }

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {


        if category.tag == 3 {

            category.text = pickOption[row]
            let id_category = row + 1

        // function call sub category with alamofire
            subCategory(id_category)    
            category.resignFirstResponder()

           // alamofire waiting for a complete reload for a second pickerview
            NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(RightViewController.refreshPickerView(_:)), name: "refresh", object: nil)

        }

    }

// function alamofire, 
 func  subCategory(id:Int ) {

        Alamofire.request(.GET, "http://vps124843.ovh.net/api/v1/events/sub-category", parameters: ["catg_id": id]).validate().responseJSON { response in
            switch response.result {
            case .Success:
                if let value = response.result.value {
                    let json = JSON(value)
                    dispatch_async(dispatch_get_main_queue()) {

                        for index in 0 ..< json["events"].count {
                            // add result in array _subCategoriesArray
                            self._subCategoriesArray.append(json["events"][index]["name"].stringValue)
                        }
                        //send notification for reload pickerview
                        NSNotificationCenter.defaultCenter().postNotificationName("refresh", object: nil, userInfo: nil)

                    }

                }
            case .Failure(let error):
                print(error)
            }
        }

    }

// function NSNotification for pickerview
func refreshPickerView(notification: NSNotification) {

        self.pickerViewSubCategory.tag = 2
        self.pickerViewSubCategory.reloadAllComponents()

    }