QT登录界面代码

将登录框的两个按钮进行实现，登录按钮需要手动连接自定义的槽函数，取消按钮右键转到槽

对于登录按钮对应的槽函数中实现：判断输入的账号是否等于"admin",密码是否为“123456”,如果匹配成功，则输出登录成功后关闭界面

如果匹配失败，输出账号和密码不匹配，请重新输入，并将密码框内容清空

对于取消按钮，在对应的槽函数中，关闭整个界面即可

widget.hwidget.cppmain.cpp

cpp

#ifndef WIDGET_H
#define WIDGET_H

#include <QDebug>
#include <QIcon>
#include <QLabel>
#include <QLineEdit>
#include <QMessageBox>
#include <QPushButton>
#include <QWidget>

class Widget : public QWidget {
  Q_OBJECT
  QLabel* logo;
  QLabel* label_user;
  QLabel* label_pwd;
  QLineEdit* edit_user;
  QLineEdit* edit_pwd;
  QPushButton* btn_login;
  QPushButton* btn_cancel;

 public:
  Widget(QWidget* parent = nullptr);
  ~Widget();
};
#endif  // WIDGET_H

cpp

#include "widget.h"

Widget::Widget(QWidget* parent) : QWidget(parent) {
  // 设置 windowicon
  this->setWindowIcon(QIcon(":/qq.png"));
  this->setWindowTitle("myQQ");
  this->setFixedSize(600, 400);

  const int input_line_width = 350;

  const int username_y = 200;
  const int password_y = 275;

  this->logo = new QLabel(this);
  this->logo->resize(600, 150);
  this->logo->setScaledContents(true);
  this->logo->setPixmap(QPixmap(":/logo.png"));
  this->label_user = new QLabel("账号", this);
  this->label_user->setPixmap(QPixmap(":/denglu.png"));
  this->label_user->resize(50, 50);
  this->label_user->setScaledContents(true);
  this->label_user->move(100, username_y);

  this->label_pwd = new QLabel("密码", this);
  this->label_pwd->setPixmap(QPixmap(":/denglumima.png"));
  this->label_pwd->resize(50, 50);
  this->label_pwd->setScaledContents(true);
  this->label_pwd->move(100, 200);
  this->label_pwd->move(100, password_y);

  this->edit_user = new QLineEdit(this);
  this->edit_user->resize(input_line_width, 50);
  this->edit_user->move(150, username_y);
  this->edit_user->setPlaceholderText("请输入帐号");

  this->edit_pwd = new QLineEdit(this);
  this->edit_pwd->resize(input_line_width, 50);
  this->edit_pwd->move(150, password_y);
  this->edit_pwd->setEchoMode(QLineEdit::Password);
  this->edit_pwd->setPlaceholderText("请输入密码");

  this->btn_login = new QPushButton("登录", this);
  this->btn_login->setIcon(QIcon(":/denglu_1.png"));
  this->btn_login->resize(100, 50);
  this->btn_login->move(250, 335);
  connect(this->btn_login, &QPushButton::clicked, [this]() {
    QString username = this->edit_user->text();
    QString password = this->edit_pwd->text();
    if (username == "admin" && password == "123456") {
      QMessageBox::information(this, "登录成功", "登录成功");
    } else {
      QMessageBox::information(this, "登录失败",
                               "输入的帐号密码不匹配，请重新输入");
      this->edit_pwd->clear();
    }
  });

  this->btn_cancel = new QPushButton("取消", this);
  this->btn_cancel->setIcon(QIcon(":/quxiao.png"));
  this->btn_cancel->resize(100, 50);
  this->btn_cancel->move(375, 335);
  connect(this->btn_cancel, &QPushButton::clicked, [this]() { this->close(); });
}

Widget::~Widget() {
  delete this->logo;
  delete this->label_user;
  delete this->label_pwd;
  delete this->edit_user;
  delete this->edit_pwd;
  delete this->btn_login;
  delete this->btn_cancel;
}

cpp

#include "widget.h"

#include <QApplication>

int main(int argc, char* argv[]) {
  QApplication a(argc, argv);
  Widget w;
  w.show();
  return a.exec();
}