qt窗口的切换

思想：在一个窗口类中声明另一继承与Qdialog的类的变量 还有在另一类中parentwidget()函数获取父类窗口，然后将其隐藏。。

窗口1：

mywin1.h

#ifndef MYWIN1_H
#define MYWIN1_H

#include <QMainWindow>
#include"mywin2.h"

namespace Ui {
class myWin1;
}

class myWin1 : public QMainWindow
{
    Q_OBJECT

public:
    explicit myWin1(QWidget *parent = 0);
    ~myWin1();

private slots:
    void on_pushButton_2_clicked();

private:
    Ui::myWin1 *ui;
    myWin2 *mywind;
};

#endif // MYWIN1_H

mywin1.cpp

#include "mywin1.h"
#include "ui_mywin1.h"
#include<mywin2.h>

myWin1::myWin1(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::myWin1)
{
    ui->setupUi(this);


}

myWin1::~myWin1()
{
    delete ui;
}

void myWin1::on_pushButton_2_clicked()
{
      mywind = new myWin2();
      mywind->show();
      this->hide();
}

mywin2.h

#ifndef MYWIN2_H
#define MYWIN2_H

#include <QMainWindow>
#include"mywin1.h"

namespace Ui {
class myWin2;
}

class myWin2 : public QMainWindow
{
    Q_OBJECT

public:
    explicit myWin2(QWidget *parent = 0);
    ~myWin2();

private slots:
    void on_pushButton_clicked();

private:
    Ui::myWin2 *ui;
    myWin1 *mywind1;
};

#endif // MYWIN2_H

mywin2.cpp

#include "mywin2.h"
#include "ui_mywin2.h"
#include"mywin1.h"

myWin2::myWin2(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::myWin2)
{
    ui->setupUi(this);
}

myWin2::~myWin2()
{
    delete ui;
}

void myWin2::on_pushButton_clicked()
{
mywind1 = new myWin1();
mywind1->parentWidget()->show();
delete this;

}