ui->treeWidget->setColumnCount(1);ui->treeWidget->setHeaderLabel("中華人民共和國");QTreeWidgetItem *item1 = new QTreeWidgetItem(ui->treeWidget, QStringList("北京市"));item1->setCheckState(0, Qt::Checked);item1->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsEditable | Qt::ItemIsAutoTristate);QTreeWidgetItem *item1_1 = new QTreeWidgetItem(item1, QStringList("海淀區"));item1_1->setCheckState(0, Qt::Checked);QTreeWidgetItem *item1_1_1 = new QTreeWidgetItem(item1_1, QStringList("上地開發區"));item1_1_1->setCheckState(0, Qt::Checked);QTreeWidgetItem *item1_2 = new QTreeWidgetItem(item1, QStringList("朝陽區"));item1_2->setCheckState(0, Qt::Checked);QTreeWidgetItem *item2 = new QTreeWidgetItem(ui->treeWidget, QStringList("上海市"));item2->setCheckState(0, Qt::Checked);QTreeWidgetItem *item2_1 = new QTreeWidgetItem(item2, QStringList("楊浦區"));item2_1->setCheckState(0, Qt::Checked);QTreeWidgetItem *item2_2 = new QTreeWidgetItem(item2, QStringList("浦東區"));item2_2->setCheckState(0, Qt::Checked);connect(ui->treeWidget, &QTreeWidget::itemClicked, this, [=](QTreeWidgetItem *item){qDebug() << item->text(0);});QTreeWidgetItemIterator it(ui->treeWidget);while (*it) {qDebug() << (*it)->text(0);(*it)->setCheckState(0, Qt::Checked);(*it)->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsAutoTristate);it++;}

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