begging of myTasks

//
//  ViewController.swift
//  MyTask
//
//  Created by HackerU on 20/03/2017.
//  Copyright © 2017 HackerU. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var userName: UITextField!
    @IBOutlet weak var userPass: UITextField!
    var myTasks=UserDefaults.standard;

    override func viewDidLoad() {

    }

    @IBAction func btnLogin(_ sender: UIButton)
    {
        if checkPass(userName: userName.text!, userPass: userPass.text!)
        {
            //pointer to our storyBoard
            let storyboard = UIStoryboard(name: "Main", bundle:nil)
            //pointer to our controller
            let controller = storyboard.instantiateViewController(withIdentifier: "taskListVC")
            //move to our new control view
            self.present(controller, animated: true, completion: nil)
        }
        else
        {
            showCustomDialog(customTitle: "Error", msg: "Wrong password")
        }
    }

    @IBAction func btnRegister(_ sender: UIButton) {
        let alert=UIAlertController(title: "Register new user", message: nil, preferredStyle: .alert)
        var uName,uPass,uPassCheck:UITextField!
        //username text field
        alert.addTextField(configurationHandler: {(input) in
            //configurations:
            input.placeholder="user name"
            uName=input //store in uName reference
        })
        //user password text field
        alert.addTextField(configurationHandler: {(input) in
            //configuration
            input.placeholder="password"
            input.isSecureTextEntry=true;
            uPass=input
        })

        //user checkPass text field
        alert.addTextField(configurationHandler: {(input) in
            //configuration
            input.placeholder="password check"
            input.isSecureTextEntry=true;
            uPassCheck=input
        })


        func okHandler(action:UIAlertAction)
        {
            //check if user exists
            if userExists(user: uName.text!)
            {
                showCustomDialog(customTitle: "Error" ,msg: "User already exists")
                return
            }


            //check if password match
            if uPass.text != uPassCheck.text
            {
              //show alert dialog with our error
                showCustomDialog(customTitle:"Error", msg: "password not match")
              return
            }
            //write new user to our plist
            //print ("user name:\(uName.text!) user pass:\(uPass.text!)")
            myTasks.setValue(uPass.text!, forKey: uName.text!)
            showCustomDialog(customTitle: "Success", msg: "Our nigger was add")
        }
        alert.addAction(UIAlertAction(title: "ok", style: .default, handler: okHandler))
        alert.addAction(UIAlertAction(title: "cancel", style: .cancel, handler: nil))
        present(alert, animated: true, completion: nil)

    }

    func showCustomDialog(customTitle:String, msg:String)
    {
        let alert=UIAlertController(title: customTitle, message: msg, preferredStyle: .alert)
        //add button with empty handler (just dismiss)
        alert.addAction(UIAlertAction(title: "OK", style: .cancel, handler: nil))
        //show alert dialog to user
        show(alert, sender:nil)
    }

    func userExists(user:String)->Bool
    {
        //create a pointer to plist file
        let usersList=Bundle.main.path(forResource: "myTasks", ofType: "plist")!

        let uData=NSDictionary(contentsOfFile: usersList) //genral Dictinary

        let myUserData:[String:[String:NSObject]]=uData as! Dictionary

        return !(myUserData.index(forKey: user)==nil)
    }

    func checkPass(userName:String, userPass:String)->Bool
    {
        if !userExists(user: userName)
        {
            showCustomDialog(customTitle: "Error", msg: "user not in the system, please register")
            return false
        }
        //create a pointer to plist file
        let usersList=Bundle.main.path(forResource: "myTasks", ofType: "plist")!

        let uData=NSDictionary(contentsOfFile: usersList) //genral Dictinary

        let myUserData:[String:[String:NSObject]]=uData as! Dictionary

        return myUserData[userName]!["password"]! as! String==userPass

    }
}