演示了 QTableWidget的初始化以及单元格值改变时响应槽函数，打印单元格 并且，最后列不一样,是combobox

#include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) { ui->setupUi(this); setFixedWidth(400); setFixedHeight(250); initUI(); } MainWindow::~MainWindow() { delete ui; } void MainWindow::initUI() { tableWidget = new QTableWidget(this); tableWidget->setFixedSize(350, 200); tableWidget->setRowCount(5); tableWidget->setColumnCount(3); QStringList headerLabels; headerLabels << "col1" << "col2" << "col3" ; tableWidget->setHorizontalHeaderLabels(headerLabels);//用QStringList初始化水平表头 setContextMenuPolicy(Qt::CustomContextMenu); for (int row = 0; row < tableWidget->rowCount(); ++row)//遍历所有行，单元格初始化 { tableWidget->setItem(row, 0, new QTableWidgetItem(""));//初始化第1列 tableWidget->setItem(row, 1, new QTableWidgetItem(""));//初始化第2列 tableWidget->setItem(row, 2, new QTableWidgetItem(""));//初始化第3列 QComboBox *comboBox = new QComboBox(); comboBox->addItem("选项1"); comboBox->addItem("选项2"); comboBox->addItem("选项3"); QTableWidgetItem *item0 = tableWidget->item(row, 0); item0->setText(QString::number(row)); QTableWidgetItem *item1 = tableWidget->item(row, 1); item1->setText(QString::number(row+5)); tableWidget->setCellWidget(row, 2, comboBox);//将第2列的单元格设置combox选项 // 连接信号和槽，并使用Lambda表达式来传递参数 connect(comboBox, QOverload<int>::of(&QComboBox::currentIndexChanged), this, [this, comboBox, row](int index)//本行及下面的几行直到 } 是lambda函数范围 { // 获取第2列的QTableWidgetItem对象作为参数 QTableWidgetItem *item = tableWidget->item(row, 2); if (item)//判断非空 tableChange(item); else qDebug() << "获取QTableWidgetItem时发生错误"; } ); } tableWidget->show(); connect(tableWidget, &QTableWidget::itemChanged, this, &MainWindow::tableChange, Qt::UniqueConnection); } void MainWindow::tableChange(QTableWidgetItem *item) { int row = item->row(); int column = item->column(); QString str ; if (column==2) { QComboBox *comboBox = qobject_cast<QComboBox*>(tableWidget->cellWidget(row, 2)); str=comboBox->currentText(); } else str=item->text(); // 打印输出已改变内容的行和列 qDebug() << "Item changed at row:" << row << ",column:" << column<<",value:" << str; }