lesson 4 Show Messages in Messagebox

1. 拖动一个pushbutton,改名为show message

2.增加一个clicked()的slot

3.在增加的函数里面写入如下语句

void MainWindow::on_pushButton_2_clicked(){    QMessageBox::information(this, tr("The Title"),tr("This is a message "));}

4.由于引用了QMessageBox所以我们需要在mainwindow.cpp开头加上

#include <QMessageBox>

5.可以更改函数得到不同的效果

QMessageBox::warning(this, tr("The Title"),tr("This is a message "));

QMessageBox::question(this, tr("The Title"),tr("This is a message "));

QMessageBox::critical(this, tr("The Title"),tr("This is a message "));