设置 QComboBox的下拉框Item高度

int main(int argc, char *argv[])

{

    QStyledItemDelegate* itemDelegate = new QStyledItemDelegate();
    ui->comboBox->setItemDelegate(itemDelegate);
    ui->comboBox->setStyleSheet("QComboBox QAbstractItemView::item { min-height: 40px; min-width: 60px; }");

}