滑条QSlider

//新建一个QSlider滑条

QSlider   *rotate=new QSlider;

//设置为“水平滚动”

rotate->setOrientation(Qt::Horizontal);

//设置滚动范围0-360

rotate->setRange(0,360)

//相当于下面的代码

rotate->setMinimum(0);

rotate->setMaximum(360);

//设置默认值为50

rotate->setValue(50);