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在关闭QWdiget窗口时弹出提示框

重写**closeEvent**函数

void closeEvent(QCloseEvent* event) override;

		QMessageBox *msgBox = new QMessageBox(QMessageBox::Question, "信息提示", "是否保存当前数据？", QMessageBox::Save | QMessageBox::No | QMessageBox::Cancel, this, Qt::WindowStaysOnTopHint);msgBox->setDefaultButton(QMessageBox::No);msgBox->button(QMessageBox::Save)->setText(u8"保存");msgBox->button(QMessageBox::No)->setText(u8"不保存");msgBox->button(QMessageBox::Cancel)->setText(u8"取消");int res = msgBox->exec();if (res == QMessageBox::Save){model->saveDate();}else if (res == QMessageBox::Cancel){event->ignore();}delete msgBox;this->close();

通过按钮在点击时弹窗

在按钮对应的槽函数中，适用于无边框的窗口

// 退出系统
void ExitAction(bool state)
{if_Data = 0;QMessageBox* msgBox = new QMessageBox(QMessageBox::Question, "提示", "退出系统？", QMessageBox::Save /*| QMessageBox::No */ | QMessageBox::Cancel, this, Qt::WindowStaysOnTopHint);msgBox->setDefaultButton(QMessageBox::No);msgBox->button(QMessageBox::Save)->setText(u8"确定");msgBox->button(QMessageBox::Cancel)->setText(u8"取消");int res = msgBox->exec();if (res == QMessageBox::Save){qApp->quit();}delete msgBox;
}