네트워크

let loginURLString = "http://localhost:3000/loginUsers"

let param = [
"userName" : userNameTextField.text ?? "",
"password" : passwordTextField.text ?? ""
]

var urlComponents = URLComponents(string: loginURLString)
urlComponeents?.query =  param.queryString

guard let hasURL= urlComponents?.url else {
return 
}

URLSession.shared.dataTask(with: hasURL) { (data, response, error) in

}

extension Dictionary {
 var queryString: String {
 var output = ""
 for (key, value) in self {
  output = output + "\(key)=\(value)&"
 }

 output = String(output.dropLast())
 return output
 }
}