【ios开发/Xcode】实现登录注册

实现效果

首先进入初始界面，输入账号Linchuantao，密码Linchuantao，显示登录失败（如下左图），因此需要进行注册，点击左下角注册，输入账号Linchuantao，密码Linchuantao，点击注册

之后再次通过账号Linchuantao，密码Linchuantao进行登录，登录成功

源代码

登录界面代码 ViewController.swift

//1.登录界面代码
//  ViewController.swift
//
//  Created by JMU文科状元 on 2021/11/21.
//  Copyright © 2021 JMU文科状元. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
    
    let userNameLabel = UILabel(frame:CGRect(x:50,y: 300, width: 200, height: 50))
    let passwordLabel = UILabel(frame:CGRect(x:50,y: 385, width: 100, height: 50))
    let enterUser = UITextField(frame: CGRect(x: 140, y: 310, width: 200, height: 40))
    let enterPassword = UITextField(frame: CGRect(x: 140, y: 390, width: 200, height: 40))
    var user = Dictionary<String,String>()
    let loginBtn = UIButton(type: .system)
let regBtn = UIButton(type: .system)

//定义一些button与text的默认值等数据
    override func viewDidLoad() {
    
    
        super.viewDidLoad()
        userNameLabel.text = "用户名"
        passwordLabel.text = "密码"
        userNameLabel.textColor=UIColor.darkGray        
        passwordLabel.textColor=UIColor.darkGray        
        self.view.addSubview(userNameLabel)
        self.view.addSubview(passwordLabel)
        enterUser.borderStyle = UITextField.BorderStyle.roundedRect
        enterPassword.borderStyle = UITextField.BorderStyle.roundedRect
        enterPassword.isSecureTextEntry = true
        enterUser.placeholder="请输入用户名" 
        enterPassword.placeholder="请输入密码"
        enterUser.clearButtonMode=UITextField.ViewMode.whileEditing
        enterPassword.clearButtonMode=UITextField.ViewMode.whileEditing
        
        self.view.addSubview(enterUser)
        self.view.addSubview(enterPassword)
        loginBtn.frame = CGRect(x: 85, y:450, width: 100, height: 50)
        regBtn.frame = CGRect(x: 200, y:450, width: 100, height: 50)
        loginBtn.setTitle("登录", for: .normal)
        loginBtn.addTarget(self, action: #selector(ViewController.mapForLogin(_:)), for: UIControl.Event.touchUpInside)
        regBtn.setTitle("注册", for: .normal)
        self.view.addSubview(loginBtn)
        
        regBtn.addTarget(self, action: #selector(ViewController.openViewController), for: .touchUpInside)
        self.view.addSubview(regBtn)
    }
    
    @objc func openViewController()
    {
    
    
        let loginView = ViewController1()
        loginView.viewController = self
        self.present(loginView, animated: true, completion: nil)
    }
    
    @objc func mapForLogin(_ button:UIButton)
    {
    
    
        if user[enterUser.text!]==enterPassword.text{
    
    
            let alertController = UIAlertController(title: "登录成功!",message: nil, preferredStyle: .alert)
            self.present(alertController, animated: true,completion: nil)
            DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1) {
    
    self.presentedViewController?.dismiss(animated: false, completion: nil)}
        }
        else{
    
    
            let alertController = UIAlertController(title: "登录失败!",message: nil, preferredStyle: .alert)
            self.present(alertController, animated: true,completion: nil)
            DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1) {
    
    self.presentedViewController?.dismiss(animated: false, completion: nil)}
        }
        
    }
    
    override func didReceiveMemoryWarning() {
    
    
        super.didReceiveMemoryWarning()
    }
    
}

注册界面代码

//2.注册界面代码
//  ViewController1.swift
//
//  Created by JMU文科状元 on 2021/11/21.
//  Copyright © 2021 JMU文科状元. All rights reserved.
//

import UIKit

class ViewController1: UIViewController {
    
    
    let userNameLabel = UILabel(frame:CGRect(x:50,y: 100, width: 200, height: 50))
    let passwordLabel = UILabel(frame:CGRect(x:50,y: 180, width: 100, height: 50))
    let enterUser = UITextField(frame: CGRect(x: 140, y: 110, width: 200, height: 40))
    let enterPassword = UITextField(frame: CGRect(x: 140, y: 190, width: 200, height: 40))
    let regBtn = UIButton(type: .system)
    let returnBtn = UIButton(type: .system)//返回
    weak var viewController : ViewController?
    override func viewDidLoad() {
    
    
        super.viewDidLoad()
        self.view.backgroundColor = UIColor.white
        userNameLabel.text = "用户名"
        passwordLabel.text = "密码"
        userNameLabel.textColor=UIColor.darkGray
        passwordLabel.textColor=UIColor.darkGray
        self.view.addSubview(userNameLabel)
        self.view.addSubview(passwordLabel)
        
        enterUser.borderStyle = UITextField.BorderStyle.roundedRect
        enterPassword.borderStyle = UITextField.BorderStyle.roundedRect
        enterPassword.isSecureTextEntry = true
        
        enterUser.placeholder="请输入用户名" //提示内容
        enterPassword.placeholder="请输入密码"
        enterUser.clearButtonMode=UITextField.ViewMode.whileEditing
        enterPassword.clearButtonMode=UITextField.ViewMode.whileEditing
        self.view.addSubview(enterUser)
        self.view.addSubview(enterPassword)
        regBtn.frame = CGRect(x: 100, y:250, width: 100, height: 50)
        regBtn.setTitle("注册", for: .normal)
        regBtn.addTarget(self, action: #selector(ViewController1.dismissSelf), for: .touchUpInside)
        self.view.addSubview(regBtn)
        returnBtn.frame = CGRect(x: 200, y:250, width: 100, height: 50)
        returnBtn.setTitle("返回", for: .normal)
for: .touchUpInside)
        self.view.addSubview(returnBtn)
    } 
    @objc func dismissSelf()
    {
    
    
        viewController?.user.updateValue(enterPassword.text!, forKey: enterUser.text!)
        self.dismiss(animated: true, completion: nil)
    }
    override func didReceiveMemoryWarning() {
    
    
        super.didReceiveMemoryWarning()
    }
    
}