QMessageBox

设置标准按钮：帮助文档代码

  QMessageBox msgBox;
  msgBox.setText("The document has been modified.");
  msgBox.setInformativeText("Do you want to save your changes?");
  msgBox.setStandardButtons(QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
  msgBox.setDefaultButton(QMessageBox::Save);
  int ret = msgBox.exec();

显式效果：

The exec() slot returns the StandardButtons value of the button that was clicked.

  switch (ret) {
    case QMessageBox::Save:
        // Save was clicked
        break;
    case QMessageBox::Discard:
        // Don't Save was clicked
        break;
    case QMessageBox::Cancel:
        // Cancel was clicked
        break;
    default:
        // should never be reached
        break;
  }

可选标准按钮：

自定义按钮：

选用：

QPushButton * addButton(const QString &text, QMessageBox::ButtonRole role)

role的可选值：

void AddStudents::my_add_students_info_ok_slots(){

    //获取lineEdit控件的输入信息
    QString name = this->ui->lineedit_name->text();
    QString id = this->ui->lineedit_id->text();

    //在QMessageBox中自定义按钮
    QMessageBox msgBox;
    msgBox.addButton("确定",QMessageBox::AcceptRole);
    QPushButton * reback_on_cancel = msgBox.addButton("取消",QMessageBox::RejectRole);
    //设置默认选中是取消按钮
    msgBox.setDefaultButton(reback_on_cancel);
    //显式lineEdit控件的输入信息
    msgBox.setText(name+'
'+id);
    int ret = msgBox.exec();
}

 预定义的四个message boxes：分别显式不同的样式（警告、询问、严重警告、信息）

Static functions are available for creating information(), question(), warning(), and critical() message boxes.

[static] QMessageBox::StandardButton QMessageBox::information(QWidget *parent, const QString &title, const QString &text, QMessageBox::StandardButtons buttons, QMessageBox::StandardButton defaultButton = NoButton)

好处，能够快捷的生成一个msg box窗体，样式是预定义样式，显式的内容，包括设置标准按钮或者自定义按钮都在一个函数调用中完成。

void AddStudents::my_add_students_info_ok_slots(){

    //获取lineEdit控件的输入信息
    QString name = this->ui->lineedit_name->text();
    QString id = this->ui->lineedit_id->text();

    int ret = QMessageBox::information(this,"请确认信息",name+'
'+id,"确认","取消");
    if(ret == 0){
        //点击第一个按钮-确定按钮
    }else if(ret == 1){
        //点击第二个按钮-取消按钮
    }
    //...依次类推
}