swift 彈出提示框

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    func showMsgbox(_message: String, _title: String = "提示"){                let alert = UIAlertController(title: _title, message: _message, preferredStyle: UIAlertControllerStyle.alert)        let btnOK = UIAlertAction(title: "好的", style: .default, handler: nil)        alert.addAction(btnOK)        self.present(alert, animated: true, completion: nil)            }        @IBAction func btnLoginClick(_ sender: Any) {

        if tvName.text == ""{

            showMsgbox(_message: "請輸入帳號")

            return

        }

        if tvPassword.text == ""{

            showMsgbox(_message: "請輸入密碼")

            return

        }

    }

swift 彈出提示框