如何删除一个子控件? [复制链接]

#ifndef  MAINWINDOW_H
#define  MAINWINDOW_H
#include <QtGui>
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    MainWindow();
    ~MainWindow();
    QLineEdit *lineEdit;
public slots:
    void on_pushButton_clicked();
};
#endif

#include "mainwindow.h"

MainWindow::MainWindow()
{
    resize(800, 600);
    QPushButton *pushButton = new QPushButton(this);
    pushButton->setText("Click Me");
    pushButton->move(100, 100);
    lineEdit = new QLineEdit(this);
    lineEdit->move(100, 400);
    connect(pushButton, SIGNAL(clicked()), this, SLOT(on_pushButton_clicked()));
}

MainWindow::~MainWindow()
{
}

void MainWindow::on_pushButton_clicked()
{
    delete lineEdit;
}