1 代码

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    //----------------设置列数---------------//
    QStringList list;
    list << "姓名" << "性别"<< "年龄";
    ui->tableWidget->setColumnCount(list.size());
    //----------------设置水平头-------------//
    ui->tableWidget->setHorizontalHeaderLabels(list);
    //----------------设置行数--------------//
    ui->tableWidget->setRowCount(5);
    //----------------设置正文--------------//
    QStringList nameList,sexList;
    nameList << "吕蒙" << "东方曜" << "东方镜" << "蒙犽" << "李白";
    sexList << "男" << "男" << "女" << "男" << "男";
    for (int i=0;i<5;i++) {
        int col = 0;
        ui->tableWidget->setItem(i,col++,new QTableWidgetItem(nameList[i]));
        ui->tableWidget->setItem(i,col++,new QTableWidgetItem(sexList[i]));
        ui->tableWidget->setItem(i,col++,new QTableWidgetItem(QString::number(i+18)));  // int转QString
    }
    // 点击按钮 添加赵云
    connect(ui->BTN_Add,&QPushButton::clicked,[=](){
        // 先判断有没有 赵云
        bool isEmpty = ui->tableWidget->findItems("赵云",Qt::MatchExactly).empty();
        if(isEmpty) {
            ui->tableWidget->insertRow(0);
            ui->tableWidget->setItem(0,0,new QTableWidgetItem("赵云"));
            ui->tableWidget->setItem(0,1,new QTableWidgetItem("男"));
            ui->tableWidget->setItem(0,2,new QTableWidgetItem("18"));
        }
        else {
            QMessageBox::warning(this,"警告","赵云有了");
        }
    });
    // 点击按钮 删除赵云
    connect(ui->BTN_Del,&QPushButton::clicked,[=](){
        bool isEmpty = ui->tableWidget->findItems("赵云",Qt::MatchExactly).empty();
        if(isEmpty) {
            QMessageBox::warning(this,"警告","赵云没有");
        }
        else {
            int row = ui->tableWidget->findItems("赵云",Qt::MatchExactly).first()->row();
            ui->tableWidget->removeRow(row);
        }
    });
}

2 相关信号槽

（1）连接表头的信号和槽

connect(horizontalHeader(), SIGNAL(sectionClicked(int)), this, SLOT(onHeaderClicked(int)));
void TableWidget::onHeaderClicked(int column) {
    //column为所点击的表头的某列
}

3 表格右键菜单

（1）创建菜单、菜单项

void TableWidget::createActions()
{
    //创建菜单项
    pop_menu = new QMenu();
    action_name = new QAction(this);
    action_size = new QAction(this);
    action_type = new QAction(this);
    action_date = new QAction(this);
    action_open = new QAction(this);   
    action_download = new QAction(this);
    action_flush = new QAction(this);
    action_delete = new QAction(this);
    action_rename = new QAction(this);
    action_create_folder = new QAction(this);
    action_open->setText(QString("打开"));
    action_download->setText(QString("下载"));
    action_flush->setText(QString("刷新"));
    action_delete->setText(QString("删除"));
    action_rename->setText(QString("重命名"));
    action_create_folder->setText(QString("新建文件夹"));
    action_name->setText(QString("名称"));
    action_size->setText(QString("大小"));
    action_type->setText(QString("项目类型"));
    action_date->setText(QString("修改日期"));
    //设置快捷键
    action_flush->setShortcut(QKeySequence::Refresh);
    //设置文件夹图标
    action_create_folder->setIcon(icon);
    QObject::connect(action_create_folder, SIGNAL(triggered()), this, SLOT(createFolder()));
}

（2）重新实现contextMenuEvent

void TableWidget::contextMenuEvent(QContextMenuEvent *event)
{
    pop_menu->clear(); //清除原有菜单
    QPoint point = event->pos(); //得到窗口坐标
    QTableWidgetItem *item = this->itemAt(point);
    if(item != NULL)
    {
       pop_menu->addAction(action_download);
       pop_menu->addAction(action_flush);
       pop_menu->addSeparator();
       pop_menu->addAction(action_delete);
       pop_menu->addAction(action_rename);
       pop_menu->addSeparator();
       pop_menu->addAction(action_create_folder);
       sort_style = pop_menu->addMenu("排序");
       sort_style->addAction(action_name);
       sort_style->addAction(action_size);
       sort_style->addAction(action_type);
       sort_style->addAction(action_date);
       //菜单出现的位置为当前鼠标的位置
       pop_menu->exec(QCursor::pos());
       event->accept();
    }
}

使用 QTableWidget 时会发现，当外部代码去更新表中的数据，却发现界面没有自动更新。
即使在更新数据之后添加了ui->tableWidget->repaint();或者ui->tableWidget->update()，界面依然没有自动更新。
只有当鼠标点击界面时，数据才被刷新。
update()是更新这个控件
viewport()->update()是更新这个控件里面的内容
所以要修改为ui->tbeConsole->viewport()->update();