用QT 写一个界面包含登录注册

以下是一个简单的用QT写的登录注册界面：

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    void on_loginButton_clicked();

    void on_registerButton_clicked();

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QMessageBox>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_loginButton_clicked()
{
    QString username = ui->usernameLineEdit->text();
    QString password = ui->passwordLineEdit->text();

    // 进行登录验证，这里只是简单地判断用户名和密码是否为空
    if (username.isEmpty() || password.isEmpty()) {
        QMessageBox::warning(this, "Error", "Username or password can't be empty!");
    } else {
        QMessageBox::information(this, "Success", "Login succeeded!");
    }
}

void MainWindow::on_registerButton_clicked()
{
    QString username = ui->usernameLineEdit->text();
    QString password = ui->passwordLineEdit->text();

    // 进行注册，这里只是简单地判断用户名和密码是否为空
    if (username.isEmpty() || password.isEmpty()) {
        QMessageBox::warning(this, "Error", "Username or password can't be empty!");
    } else {
        QMessageBox::information(this, "Success", "Register succeeded!");
    }
}

mainwindow.ui

使用QT Designer生成的UI文件，包含一个窗口、两个标签、两个文本框、两个按钮和一个水平布局。

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>400</width>
    <height>300</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Login/Register</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <layout class="QHBoxLayout" name="horizontalLayout">
    <item>
     <widget class="QGroupBox" name="groupBox">
      <property name="title">
       <string>Login/Register</string>
      </property>
      <property name="alignment">
       <set>Qt::AlignCenter</set>
      </property>
      <layout class="QVBoxLayout" name="verticalLayout">
       <item>
        <widget class="QLabel" name="usernameLabel">
         <property name="text">
          <string>Username:</string>
         </property>
        </widget>
       </item>
       <item>
        <widget class="QLineEdit" name="usernameLineEdit"/>
       </item>
       <item>
        <widget class="QLabel" name="passwordLabel">
         <property name="text">
          <string>Password:</string>
         </property>
        </widget>
       </item>
       <item>
        <widget class="QLineEdit" name="passwordLineEdit" form="EchoModePassword"/>
       </item>
       <item>
        <layout class="QHBoxLayout" name="horizontalLayout_2">
         <item>
          <widget class="QPushButton" name="loginButton">
           <property name="text">
            <string>Login</string>
           </property>
          </widget>
         </item>
         <item>
          <widget class="QPushButton" name="registerButton">
           <property name="text">
            <string>Register</string>
           </property>
          </widget>
         </item>
        </layout>
       </item>
      </layout>
     </widget>
    </item>
   </layout>
  </widget>
 </widget>
 <resources/>
 <connections/>
</ui>

效果如下图所示：