重要函数: 
1.void setCurrentIndex(int); //用下标显示当前页,.从0开始. 
2.int count(); //返回页面的数量. 
3.void insertWidget(int, QWidget*); //在下标为参数位置插入页. 
4.void addWidget(QWidget*); //加上页. 
5.void removeWidget(QWidget*); //删除页.

信号:

1.void currentChanged(int); //当前页面发生改变时，发出信号. 
2.void widgetRemoved(int); //页面被删除时，发出信号.

首先我们添加一个类，名字自定义，我这里叫MyPicture.不用Qt设计师进行拖拽，而是进行手工布局，因为当部件的量很多或者需要自动生成的时候，手工布局显得更加灵活.

以下是”MyPicture.cpp”下的代码:

#include "MyPicture.h"MyPicture::MyPicture(QWidget *parent): QWidget(parent)
{ui.setupUi(this);    //创建一个垂直布局.QVBoxLayout *vertLayout = new QVBoxLayout;    for (int i = 0; i < 5; ++i){        //创建一个水平布局.QHBoxLayout *horiLayout = new QHBoxLayout;        for (int j = 0; j < 5; ++j){QLabel *temp = new QLabel("z");temp->resize(100,100);            //也添加到vector容器里去，方便调用.this->labelArray.push_back(temp);            //把label对象添加到水平布局中去.horiLayout->addWidget(temp);}        //布局中可以添加布局.vertLayout->addLayout(horiLayout);}    //最后应用垂直布局.this->setLayout(vertLayout);
}MyPicture::~MyPicture()
{}void MyPicture::setText(QString str)
{    for (int i = 0; i < 25; ++i){        this->labelArray[i]->setText(str);}
}12345678910111213141516171819202122232425262728293031323334353637383940

以下是”MyPicture.h”的代码:

#ifndef MYPICTURE_H#define MYPICTURE_H#include <QWidget>#include "ui_MyPicture.h"#include <QMessageBox>#include <QLabel>#include <QVBoxLayout>#include <QHBoxLayout>class MyPicture : public QWidget{Q_OBJECTpublic:MyPicture(QWidget *parent = 0);~MyPicture();    void setText(QString);private:Ui::MyPicture ui;QVector<QLabel*> labelArray;
};#endif // MYPICTURE_H1234567891011121314151617181920212223242526

然后在c.ui处，进行拖拽，进行如下布局和命名. 

然后是”c.cpp”的代码:

#include "c.h"c::c(QWidget *parent): QMainWindow(parent)
{ui.setupUi(this);initStackedWidget();    //连接信号与槽.connect(ui.firstButton, SIGNAL(clicked()), this, SLOT(showFirstPageSlot()));connect(ui.secondButton, SIGNAL(clicked()), this, SLOT(showSecondPageSlot()));
}c::~c()
{}void c::showFirstPageSlot()
{    //设置当前显示的页面ui.stackedWidget->setCurrentIndex(0);
}void c::showSecondPageSlot()
{ui.stackedWidget->setCurrentIndex(1);
}//初始化堆积页.void c::initStackedWidget()
{    //先删除系统自动为你添加的两个页面.ui.stackedWidget->removeWidget(ui.page);ui.stackedWidget->removeWidget(ui.page_2);MyPicture *temp = new MyPicture;temp->setText(QString::fromLocal8Bit("哈哈"));ui.stackedWidget->addWidget(temp);MyPicture *i = new MyPicture;i->setText(QString::fromLocal8Bit("嘻嘻"));ui.stackedWidget->addWidget(i);
}123456789101112131415161718192021222324252627282930313233343536373839404142

“c.h”的代码:

#ifndef C_H#define C_H#include <QtWidgets/QMainWindow>#include "ui_c.h"#include <QStackedWidget>#include <QPushButton>#include <QMessageBox>#include "MyPicture.h"class c : public QMainWindow{Q_OBJECTpublic:c(QWidget *parent = 0);~c();    //初始化堆积页.void initStackedWidget();private slots:    void showSecondPageSlot();    void showFirstPageSlot();private:Ui::cClass ui;
};#endif // C_H12345678910111213141516171819202122232425262728293031

最后是”main.cpp”的代码:

#include "c.h"#include <QtWidgets/QApplication>#include "MyPicture.h"int main(int argc, char *argv[])
{QApplication a(argc, argv);    /*c w;w.show();*/MyPicture w;w.show();    return a.exec();
}