添加控件，添加行列数

widget.cpp

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    Init();
}

Widget::~Widget()
{
    delete ui;
}

void Widget::Init()
{
    int i,j;

     ui->tableWidget->horizontalHeader()->setStretchLastSection(true);//设置每一行最后一个单元格不留空格
     ui->tableWidget->horizontalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);//设置自适应大小
     ui->tableWidget->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);//设置等宽

     //设置表格中每一行的内容
     row_count = ui->tableWidget->rowCount();
     column_count = ui->tableWidget->columnCount();
     qDebug()<<"row"<<row_count<<"column"<<column_count;
     for( i=0;i<row_count;i++)
     {
        for( j=0;j<column_count;j++)
        {
            ui->tableWidget->setItem(i,j,new QTableWidgetItem(QString::number(j)));
        }
     }

     //打印表格数据
     //遍历数据
     QTableWidgetItem* item;
     QString str;
     for(int i = 0; i < ui->tableWidget->rowCount(); i++){
         for(int j = 0; j < ui->tableWidget->columnCount(); j++){
             item = ui->tableWidget->item(i, j);
             str = str + item->text() + " ";
         }
     }
     qDebug()<<"str = "<<str;

    // 返回鼠标单击的所在单元格的row和col
    connect(ui->tableWidget,SIGNAL(cellClicked(int,int)),this,SLOT(show_prodcut_sets(int,int)));
    connect(ui->tableWidget->selectionModel(), SIGNAL(currentChanged(const QModelIndex &, const QModelIndex &)),SLOT(doProcessSelLine(void)));

}



//单击某个单元格
void Widget::show_prodcut_sets(int row,int col)
{

    QString str;
    qDebug() << "所点击的单元格的row=" << row << ",col=" << col;
    // 获取所点击的单元格
    QTableWidgetItem* item = ui->tableWidget->item(row ,col);
        qDebug() <<"内容为："<< item->text();
}

//选中某一列
void Widget::doProcessSelLine(){
    int current_column;
    QString str;
    QTableWidgetItem* item;

    current_column = ui->tableWidget->currentColumn();//获取当前行号

    //打印行内容
    for(int j = 0; j < ui->tableWidget->columnCount(); j++){
        item = ui->tableWidget->item(current_column, j);
        str = str + item->text() + " ";
    }
    qDebug()<<str<<endl;
}

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QTabWidget>
#include <QTableWidgetItem>
#include <QDebug>
namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = nullptr);
    ~Widget();

private:
    Ui::Widget *ui;
    void Init(void);
    int row_count,column_count;
private slots:
    void show_prodcut_sets(int,int);
    void doProcessSelLine(void);
};

#endif // WIDGET_H

效果