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_())