QT5多窗口跳转实现步骤详解

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QPushButton>
#include <QHBoxLayout>

#include "page1window.h"
#include "page2window.h"

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_page1_button_clicked();

    void on_page2_button_clicked();

private:
    Ui::MainWindow *ui;
    Page1Window *page1=NULL;
    Page2Window *page2=NULL;

    QPushButton *page1_button=NULL;
    QPushButton *page2_button=NULL;
    QHBoxLayout *btn_hlayout; //水平布局


};
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"

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

    QWidget *widget=new QWidget(this);
    this->setCentralWidget(widget); // 设置为中心部件

    btn_hlayout = new QHBoxLayout(widget);

    page1=new Page1Window(this);
    page1_button =new QPushButton("前往页面一");
    page2_button =new QPushButton("前往页面二");
    btn_hlayout->addWidget(page1_button);
    btn_hlayout->addWidget(page2_button);

    // 跳转到子窗口
    connect(page1_button, &QPushButton::clicked, this, &MainWindow::on_page1_button_clicked);

    //接收返回信号显示当前窗口
    connect(page1,&Page1Window::goback,this,[=](){page1->close();this->show();});


    Page2Window *Page2FrommMin = new class Page2FromMain(this); // 使用匿名内部类
    connect(page2_button, &QPushButton::clicked, this, [=]() {Page2FrommMin->show();this->hide();});
}

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

void MainWindow::on_page1_button_clicked()
{
    this->hide();
    page1->show();
}

void MainWindow::on_page2_button_clicked()
{
    this->hide();
    page2->show();
}

#ifndef PAGE1WINDOW_H
#define PAGE1WINDOW_H

#include <QMainWindow>
#include <QPushButton>
#include <QHBoxLayout>

namespace Ui {
class Page1Window;
}

class Page1Window : public QMainWindow
{
    Q_OBJECT

public:
    explicit Page1Window(QWidget *parent = nullptr);
    ~Page1Window();

signals:
    void goback();

private slots:
    void on_return_btn_clicked();


private:
    Ui::Page1Window *ui;

    QPushButton *return_button=NULL;
    QPushButton *page2_button=NULL;
    QHBoxLayout *btn_hlayout; //水平布局
};

#endif // PAGE1WINDOW_H

#include "page1window.h"
#include "ui_page1window.h"
#include "page2window.h"

Page1Window::Page1Window(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::Page1Window)
{
    ui->setupUi(this);

    QWidget *widget=new QWidget(this);
    this->setCentralWidget(widget); // 设置为中心部件

    btn_hlayout = new QHBoxLayout(widget);


    return_button =new QPushButton("返回主页面");
    page2_button =new QPushButton("前往页面二");
    btn_hlayout->addWidget(return_button);
    btn_hlayout->addWidget(page2_button);


    connect(return_button, &QPushButton::clicked, this, &Page1Window::on_return_btn_clicked);

    Page2Window *Page2FrommPage1 = new class Page2FromPage1(this); // 使用匿名内部类
    connect(page2_button, &QPushButton::clicked, this, [=]() {Page2FrommPage1->show();this->hide();});
}

Page1Window::~Page1Window()
{
    delete ui;
}

void Page1Window::on_return_btn_clicked()
{
    emit goback();
}

#ifndef PAGE2WINDOW_H
#define PAGE2WINDOW_H

#include <QMainWindow>

#include <QPushButton>
#include <QHBoxLayout>


namespace Ui {
class Page2Window;
}

class Page2Window : public QMainWindow
{
    Q_OBJECT

public:
    explicit Page2Window(QWidget *parent = nullptr);
    ~Page2Window();

    virtual void on_return_btn_clicked() = 0; // 纯虚函数，需要在子类中实现

private:
    Ui::Page2Window *ui;

    QWidget *Widget;
    QPushButton *return_button;
    QHBoxLayout *btn_hlayout; //水平布局

};


//页面二（从主页面跳转）
class Page2FromMain : public Page2Window {
    QWidget *parentWindow1;
public:
    Page2FromMain(QWidget *parent = nullptr) : Page2Window(parent), parentWindow1(parent) {
    }

    void on_return_btn_clicked() override {
        parentWindow1->show();
        this->hide();
    }
};

//页面二（从页面一跳转）
class Page2FromPage1 : public Page2Window {
    QWidget *parentWindow2;
public:
    Page2FromPage1(QWidget *parent = nullptr) : Page2Window(parent), parentWindow2(parent) {
    }

    void on_return_btn_clicked() override {
        parentWindow2->show();
        this->hide();
    }
};

#endif // PAGE2WINDOW_H

#include "page2window.h"
#include "ui_page2window.h"

Page2Window::Page2Window(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::Page2Window)
{
    ui->setupUi(this);

    QWidget *widget=new QWidget(this);
    this->setCentralWidget(widget); // 设置为中心部件

    btn_hlayout = new QHBoxLayout(widget);

    return_button =new QPushButton("返回父页面");
    btn_hlayout->addWidget(return_button);

    connect(return_button, &QPushButton::clicked, this, &Page2Window::on_return_btn_clicked);

}

Page2Window::~Page2Window()
{
    delete ui;
}