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视频展示效果（结合代码看效果更佳哦，代码在最下面）：

效果图： 

点击详细文本之后展开如下图：

图标可选：

按钮角色可选：

.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include <QMessageBox>
#include <QPushButton>
#include <QTimer>
#include <QDialog>
#define ETIME 10//每次重试的时间
namespace Ui {
class MainWindow;
}class MainWindow : public QMainWindow
{Q_OBJECTpublic:explicit MainWindow(QWidget *parent = 0);~MainWindow();public slots:void slotRetry();void slotCountdown();void slotClose();void slotBtnClick(QAbstractButton* btn);private:Ui::MainWindow *ui;QMessageBox *m_mBox;QPushButton *m_retryBrn;QPushButton *m_closeBtn;QTimer *m_tmrRetry;int m_iCount;int iRetryCount;
};#endif // MAINWINDOW_H

.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent),ui(new Ui::MainWindow)
{//ui->setupUi(this);m_tmrRetry = new QTimer(this);m_tmrRetry->setInterval(1000);connect(m_tmrRetry,SIGNAL(timeout()),this,SLOT(slotCountdown()));m_mBox = new QMessageBox();m_mBox->setIcon(QMessageBox::Critical);//设置图标m_mBox->setWindowTitle("错误");//设置对话框标题m_mBox->setText("测试说明");//设置副标题m_mBox->setInformativeText("今天是个好日子");//设置提示说明//m_mBox->setDetailedText("点个关注吧");//设置详细文本m_retryBrn = new QPushButton();m_closeBtn = new QPushButton();//添加按钮的方法//..1m_retryBrn = m_mBox->addButton("重试",QMessageBox::AcceptRole);m_closeBtn = m_mBox->addButton("关闭",QMessageBox::RejectRole);//..2//    m_retryBrn->setText("重试");//    m_closeBtn->setText("关闭");//    m_mBox->addButton(m_retryBrn,QMessageBox::AcceptRole);//    m_mBox->addButton(m_closeBtn,QMessageBox::RejectRole);//_________________________________________//绑定按钮槽函数的方法//..1connect(m_mBox,SIGNAL(buttonClicked(QAbstractButton*)),this,SLOT(slotBtnClick(QAbstractButton*)));//..2connect(m_retryBrn,SIGNAL(clicked(bool)),this,SLOT(slotRetry()));//关闭弹窗后触发的信号connect(m_mBox,SIGNAL(destroyed(QObject*)),this,SLOT(slotClose()));m_mBox->show();m_iCount=0;//已经重试了几次iRetryCount=0;//总共重试几次
}MainWindow::~MainWindow()
{delete ui;
}void MainWindow::slotRetry()
{m_mBox->show();//一定要show，不然点击按钮之后，弹窗就会消失，就看不到倒计时的效果了if(m_retryBrn->isEnabled()){m_retryBrn->setEnabled(false);m_closeBtn->setEnabled(false);}iRetryCount++;if(iRetryCount>3)//最多只重试3次{qDebug() << "重试次数已试完";m_mBox->close();m_mBox->deleteLater();return;}qDebug() << "重试方式一";m_tmrRetry->start();m_retryBrn->setText(QString("重试 %1").arg(ETIME));
}void MainWindow::slotCountdown()
{m_mBox->show();m_iCount++;int iTemp = ETIME - m_iCount;if(iTemp<=0){//可以在倒计时结束后做你想做的事m_tmrRetry->stop();m_retryBrn->setEnabled(true);m_closeBtn->setEnabled(true);m_iCount=0;iTemp=ETIME;}m_retryBrn->setText(QString("重试 %1").arg(iTemp));
}void MainWindow::slotClose()
{qDebug() << "弹窗已关闭";
}void MainWindow::slotBtnClick(QAbstractButton *btn)
{if(btn == m_retryBrn){qDebug() << "重试 方法2";}else if(btn == m_closeBtn){qDebug() << "关闭 方法2";}
}