PyQT5-QSlide滑块

 """
     QSlider:是一个小滑块组件，这个小滑块能够被拖着一起滑动，用于通常修改具有一定范围的数据
     Author: dengyexun
     DateTime: 2018.11.21
 """
 from PyQt5.QtWidgets import QWidget, QSlider, QApplication, QLabel
 from PyQt5.QtCore import Qt
 from PyQt5.QtGui import QPixmap
 import sys
 import os
 
 class Example(QWidget):
 
     def __init__(self):
         super().__init__()
 
         self.initUI()
 
     def initUI(self):
         # 初始化一个水平滑块
         sld = QSlider(Qt.Horizontal, self)
         # 设置焦点策略
         sld.setFocusPolicy(Qt.NoFocus)
         sld.setGeometry(30,40,100,30)
         # 滑动滑块时，传递整型数据给changeValue的value参数
         sld.valueChanged[int].connect(self.changeValue)
 
         # 初始化一个label
         self.label = QLabel(self)
         self.label.setPixmap(QPixmap('../resources/mute.png'))
         self.label.setGeometry(100,  100, 200, 300)
 
         self.setGeometry(300, 300, 600, 600)
         self.setWindowTitle('slider')
         self.show()
 
     def changeValue(self, value):
         """
         自定义函数
         :param value: 更改的数值
         :return:
         """
         up_dir = os.path.abspath(os.path.join(os.getcwd(), ".."))
         if value == 0:
             self.label.setPixmap(QPixmap(up_dir+'./resources/mute.png'))
         elif value >0 and value <= 30:
             self.label.setPixmap(QPixmap(up_dir+'./resources/max.png'))
         elif value >30 and value < 80:
             self.label.setPixmap(QPixmap(up_dir+'./resources/med.png'))
         else:
             self.label.setPixmap(QPixmap(up_dir+'./resources/min.png'))
 
 if __name__ == '__main__':
     app = QApplication(sys.argv)
     ex = Example()
     sys.exit(app.exec_())