Swift storyBoard 判断 segue 目标

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {        if segue.identifier == "ModalToPassCode"{            let destVC = segue.destination as! PassCodeViewController            destVC.bikeCode = numberTextField.text!            NetworkHelper.getPassCode(numberTextField.text!, completion: { (isSuccessed, passCode) in                destVC.passCode = passCode!.characters.map{                    return $0.description                }            })        }    }