Use of unresolved identifier 'displayAlertMessage' - ios

Question

I tried the moved the code around a bit. The errors I got was use of local variable displayMessage before its declaration. So I moved the func displayAlertMessage above the display an alert Message comment, the new error is use of unresolved identifier 'displayAlertMessage'
//
// RegisterPageViewController.swift
// UserLoginandRegistration
//
// Created by Iyah Chulo on 17/11/2017.
// Copyright © 2017 Iyah Chulo. All rights reserved.
//
import UIKit
class RegisterPageViewController: UIViewController {
#IBOutlet weak var userEmailTextField: UITextField!
#IBOutlet weak var userPasswordTextField: UITextField!
#IBOutlet weak var ReenterPasswordTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func RegisterButtonTapped(_ sender: Any) {
let userEmail = userEmailTextField.text;
let userPassword = userPasswordTextField.text;
let userReenterPassword = ReenterPasswordTextField.text;
// Check for empty fields
if((userEmail?.isEmpty)! || (userPassword?.isEmpty)! ||
(userReenterPassword?.isEmpty)!)
{
func displayAlertMessage(userMessage: String) { let myAlert = UIAlertController(title:"Alert", message: userMessage, preferredStyle:
UIAlertControllerStyle.alert);
let okAction = UIAlertAction(title:"Ok", style:
UIAlertActionStyle.default, handler:nil)
myAlert.addAction(okAction);
self.present(myAlert, animated: true,
completion:nil)
}
//Display alert message
displayAlertMessage(userMessage: "All fields are required")
return;
}
//Check if passwords match
if(userPassword != userReenterPassword)
{
// Display an alert message
displayAlertMessage(userMessage: "Passwords do not match")
return;
}
// Store data
UserDefaults.standard.set(userEmail, forKey:"userEmail")
UserDefaults.standard.set(userEmail, forKey:"userPassword")
UserDefaults.standard.synchronize()
// Display alert message with confirmation
var myAlert = UIAlertController(title:"Alert", message: "Registration is successful.Thank you!", preferredStyle:
UIAlertControllerStyle.alert);
let okAction = UIAlertAction(title:"Ok", style:
UIAlertActionStyle.default) { action in
self.dismiss(animated: true, completion:nil)
}
}
}

Answer 1

Your displayAlertMessage function definition needs to be outside of the other functions in your class.
Also, please note that Swift does not require semicolons!
Try this:
import UIKit
class RegisterPageViewController: UIViewController {
#IBOutlet weak var userEmailTextField: UITextField!
#IBOutlet weak var userPasswordTextField: UITextField!
#IBOutlet weak var ReenterPasswordTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func RegisterButtonTapped(_ sender: Any) {
let userEmail = userEmailTextField.text
let userPassword = userPasswordTextField.text
let userReenterPassword = ReenterPasswordTextField.text
// Check for empty fields
if((userEmail?.isEmpty)! || (userPassword?.isEmpty)! ||
(userReenterPassword?.isEmpty)!)
{
//Display alert message
displayAlertMessage(userMessage: "All fields are required")
return;
}
//Check if passwords match
if(userPassword != userReenterPassword)
{
// Display an alert message
displayAlertMessage(userMessage: "Passwords do not match")
return;
}
// Store data
UserDefaults.standard.set(userEmail, forKey:"userEmail")
UserDefaults.standard.set(userEmail, forKey:"userPassword")
UserDefaults.standard.synchronize()
// Display an alert message
displayAlertMessage(userMessage: "Registration is successful.Thank you!")
}
func displayAlertMessage(userMessage: String) {
let myAlert = UIAlertController(title:"Alert", message: userMessage, preferredStyle: UIAlertControllerStyle.alert)
let okAction = UIAlertAction(title:"Ok", style: UIAlertActionStyle.default) {
action in
self.dismiss(animated: true, completion:nil)
}
myAlert.addAction(okAction);
self.present(myAlert, animated: true, completion: nil)
}
}