//第一个参数代表：第几列，第二个参数：代表要进行的操作(对内容进行调整，或者，添加拉伸达到拉长表格的效果)
ui->tableWidget->horizontalHeader()->setSectionResizeMode(0,QHeaderView::ResizeToContents);
ui->tableWidget->horizontalHeader()->setSectionResizeMode(1,QHeaderView::Stretch);
ui->tableWidget->horizontalHeader()->setSectionResizeMode(2,QHeaderView::Stretch);
ui->tableWidget->horizontalHeader()->setSectionResizeMode(3,QHeaderView::Stretch);
ui->tableWidget->horizontalHeader()->setSectionResizeMode(4,QHeaderView::Stretch);
ui->tableWidget->horizontalHeader()->setSectionResizeMode(5,QHeaderView::ResizeToContents);
效果：
标签：QHeaderView,QT,Stretch,QTableWidget,setSectionResizeMode,tableWidget,ui,一列,horiz From： https://www.cnblogs.com/RedWetPlace/p/17180517.html