C++day3

第一个界面的头文件：

#ifndef WIDGET_H
#define WIDGET_H
 
#include <QWidget>
#include <QMessageBox>
#include <QDebug>
 
QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE
 
class Widget : public QWidget
{
    Q_OBJECT
 
public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
signals:
    void jump();
 
private slots:
 
    void on_pushButton_clicked();
 
    void on_pushButton_2_clicked();
 
private:
    Ui::Widget *ui;
};
#endif // WIDGET_H

第一个界面的源文件：

#include "widget.h"
#include "ui_widget.h"
 
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
}
 
Widget::~Widget()
{
    delete ui;
}
//登录按钮所对应的槽函数
void Widget::on_pushButton_clicked()
{
    if(ui->Username->text() == "1441147475" && ui->Passwd->text() == "20010107pc")
    {
          QMessageBox msg(QMessageBox::Information,
                          "提示",
                          "登录成功",
                          QMessageBox::Ok
                      );
          //调用exec()弹出对话框
          int ret = msg.exec();
          //根据exec()函数的返回值执行功能
          if(ret == QMessageBox::Ok)
          {
              this->close();
              emit jump();
          }
    }
    else
    {
        QMessageBox msg(QMessageBox::Critical,
                        "错误",
                        "账号和密码不匹配，是否重新登录？",
                        QMessageBox::Yes | QMessageBox::No
                        );
        //调用exec()弹出对话框
        int ret = msg.exec();
        if(ret == QMessageBox::Yes)
        {
            ui->Passwd->clear();
        }
        else
        {
            this->close();
        }
    }
}
 
void Widget::on_pushButton_2_clicked()
{
    QMessageBox msg(QMessageBox::Question,
                    "提示信息",
                    "您是否确定要退出登录？",
                    QMessageBox::Yes | QMessageBox::No
                    );
    int ret = msg.exec();
    if(ret == QMessageBox::Yes)
    {
        this->close();
    }
    else
    {
        msg.close();
    }
}

第二个界面的头文件：

#ifndef SECOND_H
#define SECOND_H
 
#include <QWidget>
 
namespace Ui {
class second;
}
 
class second : public QWidget
{
    Q_OBJECT
 
public:
    explicit second(QWidget *parent = nullptr);
    ~second();
 
public slots:
    void jump_slot();
 
private:
    Ui::second *ui;
};
 
#endif // SECOND_H

第二个界面的源文件：

#include "second.h"
#include "ui_second.h"
 
second::second(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::second)
{
    ui->setupUi(this);
}
 
second::~second()
{
    delete ui;
}
//ok信号对应槽函数的实现
void second::jump_slot()
{
    this->show();
}