1. 单元格添加checkBox，并居中对齐

QCheckBox* checkItem = new QCheckBox(ui->tableWidget);
checkItem->setCheckState(Qt::Unchecked);
QWidget *widgetSet = new QWidget();
QHBoxLayout *tmp_layout = new QHBoxLayout(widgetSet);
tmp_layout->addWidget(checkItem);
tmp_layout->setAlignment(checkItem, Qt::AlignCenter);
ui->m_tableWidget_XZQDM->setCellWidget(nRow, nCol, widgetSet);
ui->m_tableWidget_XZQDM->setColumnWidth(0, 70);

2. 上面这种情况下，遍历得到checkBox

QWidget *w = (QWidget*)ui->tableWidget->cellWidget(row, 0);
QList<QCheckBox*> checkBoxList = w->findChildren<QCheckBox*>();
QCheckBox* checkItem = checkBoxList.at(0);
checkItem->setCheckState((Qt::CheckState)selectState);

3. 单元格设置宽度，高度

ui->tableWidget->setColumnWidth(nCol, 70);

4. 清除当前网格的内容

ui->tableWidget->clearContents();

5. 设置网格的第一列那个序号表头不显示

ui->tableWidget->verticalHeader()->setVisible(false);

6. 设置行列的数量

ui->tableWidget->setColumnCount(3);
ui->tableWidget->setRowCount(4);

7. 显示行表头的显示内容

QStringList qheadLables;
qheadLables << tr("checkState") << tr("名称1") << tr("名称2");
ui->tableWidget->setHorizontalHeaderLabels(qheadLables);

8. 设置网格的单元格处于不可编辑状态

QTableWidgetItem* pWidgetItem = new QTableWidgetItem("22");
pWidgetItem->setFlags(pWidgetItem->flags() & (~Qt::ItemIsEditable));
ui->tableWidget->setItem(nRow, nCol, pWidgetItem);

9. 设置单元格灰掉

QTableWidget* pTableWidget = ui->tableWidget;
QTableWidgetItem* pItemDM = (QTableWidgetItem*)pTableWidget->item(row, nCol);
pItemDM->setFlags(pItemDM->flags() & (~Qt::ItemIsEnabled));
pTableWidget->setItem(row, nCol, pItemDM);

10. 合并单元格

ui->tableWidget->setSpan(nRowIndex, nColIndex, nRowCount, nColCount); 
ui->tableWidget->setSpan(0, 1, 2, 3); //表示序号为0的行，序号为1的列的这个单元格开始，包含自己，向下共选择两行；包含自己，向右供选择3列，然后合并