The QButtonGroup class provides a container to organize groups of button widgets.
QButtonGroup provides an abstract container into which button widgets can be placed. It does not provide a visual representation of this container (see QGroupBox for a container widget), but instead manages the states of each of the buttons in the group.
文档如上,既然不提供可视化的容器,想必在designer中无法看到是理所应当的,还是用groupbox或者Q3ButtonGroup吧
不用设计器是王道阿~~