QPushbutton用于发送toggled(bool)的checkable 属性

默认状况下checkable是不选中的，Button默认为触发按钮(trigger button)，按下去马上弹起来

选中checkable后，Button变成切换按钮(toggle button)，可以有两种状态：按下/弹起；此时该按钮可以发射 toggled(bool) 信号，与槽函数setVisible(bool) 结合即可用于控件交替显示；

下面图中两个“more”按钮，上边是弹起状态，下边是按下状态



问题：

I have the follwing code where

moreButton

is
a

QPushButton

.
When I toggle the button, nothing happens.

Shouldn't it show or hide

secondaryGroupBox

and

tertiaryGroupBox

?

QObject::connect(moreButton, SIGNAL(toggled(bool)), secondaryGroupBox, SLOT(setVisible(bool)));
QObject::connect(moreButton, SIGNAL(toggled(bool)), tertiaryGroupBox, SLOT(setVisible(bool)));

回答：

Most likely, your pushbutton is not

checkable()

.
Try

moreButton->setCheckable(true)

A non-checkable button never emits the

toggled(bool)

signal.