self.sp=QSlider(Qt.Horizontal)
self.sp=Qslider(Qt.Vertical)

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *

class SliderDemo(QWidget):
  def __init__(self,parent=None):
    super(SliderDemo, self).__init__(parent)
    #設(shè)置標(biāo)題與初始大小
    self.setWindowTitle('QSlider例子')
    self.resize(300,100)

    #垂直布局
    layout=QVBoxLayout()

    #創(chuàng)建標(biāo)簽，居中
    self.l1=QLabel('Hello PyQt5')
    self.l1.setAlignment(Qt.AlignCenter)
    layout.addWidget(self.l1)
    #創(chuàng)建水平方向滑動(dòng)條
    self.s1=QSlider(Qt.Horizontal)
    ##設(shè)置最小值
    self.s1.setMinimum(10)
    #設(shè)置最大值
    self.s1.setMaximum(50)
    #步長
    self.s1.setSingleStep(3)
    #設(shè)置當(dāng)前值
    self.s1.setValue(20)
    #刻度位置，刻度下方
    self.s1.setTickPosition(QSlider.TicksBelow)
    #設(shè)置刻度間距
    self.s1.setTickInterval(5)
    layout.addWidget(self.s1)
    #設(shè)置連接信號(hào)槽函數(shù)
    self.s1.valueChanged.connect(self.valuechange)

    self.setLayout(layout)

  def valuechange(self):
    #輸出當(dāng)前地刻度值，利用刻度值來調(diào)節(jié)字體大小
    print('current slider value=%s'%self.s1.value())
    size=self.s1.value()
    self.l1.setFont(QFont('Arial',size))

if __name__ == '__main__':
  app=QApplication(sys.argv)
  demo=SliderDemo()
  demo.show()
  sys.exit(app.exec_())

self.s1.valueChanged.connect(self.valuechange)

size=self.s1.value()
self.l1.setFont(QFont('Arial',size))

self.s1.setMinimum(10)
self.s1.setMaximum(50)
self.s1.setTickInterval(5)