msgboxdlg.h

#ifndef MSGBOXDLG_H
#define MSGBOXDLG_H

#include <QDialog>
#include <QLabel>
#include <QPushButton>
#include <QGridLayout>
#include <QMessageBox>

class msgboxdlg : public QDialog
{
    Q_OBJECT

public:
    msgboxdlg(QWidget *parent = nullptr);
    ~msgboxdlg();
private slots:
    void ShowQustionMsg();
    void ShowInFormationMsg();
    void ShowWarningMsg();
    void ShowCriticalMsg();
    void ShowAboutMsg();
    void ShowAboutAtMsg();
    void ShowCustomMsg();
private:
    QLabel* Label;
    QPushButton* QuestionBtn;
    QPushButton* InformationBtn;
    QPushButton* WarningBtn;
    QPushButton* CriticalBtn;
    QPushButton* AboutBtn;
    QPushButton* AboutQtBtn;
    QPushButton* CustomBtn;
    QGridLayout* MainLayout;

};
#endif // MSGBOXDLG_H

msgboxdlg.cpp

#include "msgboxdlg.h"

msgboxdlg::msgboxdlg(QWidget *parent)
    : QDialog(parent)
{
    setWindowTitle(tr("标准消息对话框实例"));
    //实例化控件对象
    Label = new QLabel(tr("请选择一种消息框"));
    QuestionBtn = new QPushButton(tr("QuestionMsg"));
    InformationBtn = new QPushButton(tr("InformationMsg"));
    WarningBtn = new QPushButton(tr("WarningMsg"));
    CriticalBtn = new QPushButton(tr("CriticalMsg"));
    AboutBtn = new QPushButton(tr("AboutMsg"));
    AboutQtBtn = new QPushButton(tr("AboutQtMsg"));
    CustomBtn = new QPushButton(tr("CustomMsg"));
    //布局
    MainLayout = new QGridLayout(this);
    MainLayout->addWidget(Label,0,0,1,2);
    MainLayout->addWidget(QuestionBtn,1,0);
    MainLayout->addWidget(InformationBtn,1,1);
    MainLayout->addWidget(WarningBtn,2,0);
    MainLayout->addWidget(CriticalBtn,2,1);
    MainLayout->addWidget(AboutBtn,3,0);
    MainLayout->addWidget(AboutQtBtn,3,1);
    MainLayout->addWidget(CustomBtn,4,0,1,2);

    //事件关联
    connect(QuestionBtn,SIGNAL(clicked()),this,SLOT(ShowQustionMsg()));
    connect(InformationBtn,SIGNAL(clicked()),this,SLOT(ShowInFormationMsg()));
    connect(WarningBtn,SIGNAL(clicked()),this,SLOT(ShowWarningMsg()));
    connect(CriticalBtn,SIGNAL(clicked()),this,SLOT(ShowCriticalMsg()));
    connect(AboutBtn,SIGNAL(clicked()),this,SLOT(ShowAboutMsg()));
    connect(AboutQtBtn,SIGNAL(clicked()),this,SLOT(ShowAboutAtMsg()));
    connect(CustomBtn,SIGNAL(clicked()),this,SLOT(ShowCustomMsg()));





}

msgboxdlg::~msgboxdlg() {}

void msgboxdlg::ShowQustionMsg()
{
    Label->setText(tr("Question Message box"));

    switch(QMessageBox::question(this,tr("Question 消息框"),tr("您现在已经修改完成，是否要结束程序？"),
                                  QMessageBox::Ok|QMessageBox::Cancel,QMessageBox::Ok))
    {
    case QMessageBox::Ok:
        Label->setText(tr("Question button/ok"));
        break;
    case QMessageBox::Cancel:
        Label->setText(tr("Question button/cancel"));
        break;
    default:
        break;
    }
    return;
}

void msgboxdlg::ShowInFormationMsg()
{
    Label->setText(tr("Information Message Box"));
    QMessageBox::information(this,tr("Information消息框"),tr("这是Information消息框测试，欢迎您！"));
    return;
}

void msgboxdlg::ShowWarningMsg()
{
    Label->setText(tr("warning message box"));
    switch(QMessageBox::warning(this,tr("warning 消息框"),tr("您修改的文档内容还未保存，是否要保存文档"), QMessageBox::Save|QMessageBox::Discard|QMessageBox::Cancel,QMessageBox::Save))
    {
    case QMessageBox::Save:
        Label->setText("Save");
        break;
    case QMessageBox::Discard:
        Label->setText("Discard");
        break;
    case QMessageBox::Cancel:
        Label->setText("Cancel");
        break;

    default:
        break;

    }

    return;

}

void msgboxdlg::ShowCriticalMsg()
{
    Label->setText(tr("Critical MessBox "));
    QMessageBox::critical(this,tr("Critical 消息框"),tr("这是一个critical 消息框"));
    return;
}

void msgboxdlg::ShowAboutMsg()
{
    Label->setText(tr("about MessBox "));
    QMessageBox::about(this,tr("about 消息框"),tr("这是一个about 消息框"));
    return;
}

void msgboxdlg::ShowAboutAtMsg()
{
    Label->setText(tr("aboutQt MessBox "));
    QMessageBox::aboutQt(this,tr("aboutQt 消息框"));
    return;
}

void msgboxdlg::ShowCustomMsg()
{
    Label->setText(tr("Custom 消息框"));
    QMessageBox CustomBox;
    CustomBox.setWindowTitle(tr("自定义消息框"));
    QPushButton* YesBtn = CustomBox.addButton(tr("yes"),QMessageBox::ActionRole);
    QPushButton* NoBtn = CustomBox.addButton(tr("No"),QMessageBox::ActionRole);
    QPushButton* Cancel = CustomBox.addButton(QMessageBox::Cancel);
    CustomBox.setText(tr("这是一个用户自定义消息框"));
    CustomBox.setIconPixmap(QPixmap("312.png"));
    CustomBox.exec();
    if(CustomBox.clickedButton() == YesBtn)
    {
       Label->setText(tr("Custom YesBtn消息"));
           return;
    }
    if(CustomBox.clickedButton() == NoBtn)
    {
        Label->setText(tr("Custom NoBtn消息"));
           return;
    }
    if(CustomBox.clickedButton() == Cancel)
    {
        Label->setText(tr("Custom Cancel消息"));
           return;
    }
    return;
}

main.cpp

#include "msgboxdlg.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    msgboxdlg w;
    w.show();
    return a.exec();
}

运行图

QustionMsg

InFormationMsg

WarningMsg

CriticalMsg

AboutMsg

AboutAtMsg

自定义