【提问】qslider中的信号不能被响应呢？ [复制链接]

程序如下，运行时，setValue1（int）中的程序 死活都不被执行，不知道为什么，请教各位了。
formdialog::formdialog(){
  horizontalSlider1 = new QSlider(this);
  horizontalSlider1->setObjectName(QString::fromUtf8("horizontalSlider1"));
  horizontalSlider1->setGeometry(QRect(130, 270, 181, 21));
  horizontalSlider1->setOrientation(Qt::Horizontal);
  horizontalSlider1->setRange(-180,180);
  horizontalSlider1->setSingleStep(1);
  horizontalSlider1->setPageStep(10);
  horizontalSlider1->setTickInterval(30);
  horizontalSlider1->setTracking(true);
  horizontalSlider1->setMouseTracking(true);
  horizontalSlider1->setTickPosition(QSlider::TicksBothSides);
  horizontalSlider1->setValue(0);

QObject::connect(horizontalSlider1, SIGNAL(valueChanged(int)), this, SLOT(setValue1(int)));
  QObject::connect(horizontalSlider1, SIGNAL(sliderMoved (int)), this, SLOT(setValue1(int)));
  QObject::connect(horizontalSlider1, SIGNAL(sliderPressed ()),this,SLOT(setValue1(int)));
....
}

formdialog::setValue1(int i)
{
}