[英]Qt5 Signal and slots does not seem to work
I am trying to change a label's text to a slider's value when the slider moves. 我试图在滑块移动时将标签的文本更改为滑块的值。 My slider is named
sld_bet
and my label is lbl_bet
. 我的滑块名为
sld_bet
,标签为lbl_bet
。 sld_bet_changed()
is a function that only has a breakpoint in it, and will eventually contain lbl_bet
's modifying code. sld_bet_changed()
是一个只有断点的函数,最终将包含lbl_bet
的修改代码。
The breakpoint is never reached, and I do not understand why. 从未达到断点,我也不明白为什么。
app::app(QWidget *parent)
: QMainWindow(parent)
{
ui.setupUi(this);
connect(ui.sld_bet, SIGNAL(ui.sld_bet->sliderMoved()),
this, SLOT(sld_bet_changed()));
}
改成
connect(ui.sld_bet, SIGNAL(sliderMoved()), this, SLOT(sld_bet_changed()));
If you are using Qt 5, use the new connect syntax. 如果您使用的是Qt 5,请使用新的connect语法。 That way the compiler will throw an error if something is not correct.
这样,如果某些不正确的内容,编译器将抛出错误。
connect(ui.sld_bet, &QSlider::sliderMoved, this, &app::sld_bet_changed);
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