qt--界面切换

创建新界面类的方法：

右击工程-->add new-->

-->选择相应的窗体类

方法一：信号槽函数法

oneform.h

#ifndef ONEFORM_H
#define ONEFORM_H

#include <QWidget>
#include "twoform.h"  //要创建第二界面，所以需要第二界面的头文件

QT_BEGIN_NAMESPACE
namespace Ui { class oneform; }
QT_END_NAMESPACE

class oneform : public QWidget
{
    Q_OBJECT

public:
    oneform(QWidget *parent = nullptr);
    ~oneform();
public slots:
    void one_two(void); //第一界面进入第二界面的槽函数
    void oneshow(void);  //显示界面1，隐藏界面2

private:
    Ui::oneform *ui;
    twoform* win;  //创建第二界面
};
#endif // ONEFORM_H

oneform.cpp

#include "oneform.h"
#include "ui_oneform.h"

oneform::oneform(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::oneform)
{
    ui->setupUi(this);
    connect(ui->pushButton,SIGNAL(clicked(void)),this,SLOT(one_two(void)));
    win=new twoform;  //创建界面2
    connect(win,SIGNAL(oneFunc(void)),this,SLOT(oneshow(void)));
    //接受界面2发送的信号

}

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

void oneform::one_two()
{

    win->show();
    this->hide();
}

void oneform::oneshow()
{
    this->show();

}

twoform.h

#ifndef TWOFORM_H
#define TWOFORM_H

#include <QWidget>

namespace Ui {
class twoform;
}

class twoform : public QWidget
{
    Q_OBJECT

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

private:
    Ui::twoform *ui;
public slots:
    void two_one(void); //第二界面进入第一界面的槽函数
signals:
    void oneFunc(void);



};

#endif // TWOFORM_H

twoform.cpp

#include "twoform.h"
#include "ui_twoform.h"

twoform::twoform(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::twoform)
{
    ui->setupUi(this);
    connect(ui->pushButton,SIGNAL(clicked(void)),this,SLOT(two_one(void)));
}

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

void twoform::two_one()
{
    emit oneFunc(); //发射信号,通知界面1显示---界面1需要接受这个信号
    this->hide();
}