PYQT5 多选下拉列表框

from PyQt5.QtWidgets import QComboBox, QLineEdit, QListWidget, QCheckBox, QListWidgetItem, QApplication
from PyQt5.QtCore import pyqtSignal
import sys

"""
1.将show函数改成show0
2.增加changeitemlist函数
3.增加信号signa
"""


class ComboCheckBox(QComboBox):
    signa = pyqtSignal(list)

    def __init__(self, items):  # items==[str,str...]
        super(ComboCheckBox, self).__init__()
        self.items = items
        self.items.insert(0, '全部')

        self.row_num = len(self.items)
        self.Selectedrow_num = 0
        self.qCheckBox = []
        self.qLineEdit = QLineEdit()
        self.qLineEdit.setReadOnly(True)
        self.qListWidget = QListWidget()
        self.addQCheckBox(0)
        self.qCheckBox[0].stateChanged.connect(self.All)
        for i in range(1, self.row_num):
            self.addQCheckBox(i)
            self.qCheckBox[i].stateChanged.connect(self.show0)
        self.setModel(self.qListWidget.model())
        self.setView(self.qListWidget)
        self.setLineEdit(self.qLineEdit)
        self.setMaxVisibleItems(100)  # 避免滑条的出现引起滑条偷吃标签的问题

    def addQCheckBox(self, i):
        self.qCheckBox.append(QCheckBox())
        qItem = QListWidgetItem(self.qListWidget)
        self.qCheckBox[i].setText(self.items[i])
        self.qListWidget.setItemWidget(qItem, self.qCheckBox[i])

    def Selectlist(self):
        Outputlist = []
        for i in range(1, self.row_num):
            if self.qCheckBox[i].isChecked() == True:
                Outputlist.append(self.qCheckBox[i].text())
        self.Selectedrow_num = len(Outputlist)

        return Outputlist

    def show0(self):
        show0 = ''
        Outputlist = self.Selectlist()
        self.signa.emit(Outputlist)
        self.qLineEdit.setReadOnly(False)
        self.qLineEdit.clear()
        for i in Outputlist:
            show0 += i + ';'
        if self.Selectedrow_num == 0:
            self.qCheckBox[0].setCheckState(0)
        elif self.Selectedrow_num == self.row_num - 1:
            self.qCheckBox[0].setCheckState(2)
        else:
            self.qCheckBox[0].setCheckState(1)
        self.qLineEdit.setText(show0)
        self.qLineEdit.setReadOnly(True)

    def All(self, zhuangtai):
        if zhuangtai == 2:
            for i in range(1, self.row_num):
                self.qCheckBox[i].setChecked(True)
        elif zhuangtai == 1:
            if self.Selectedrow_num == 0:
                self.qCheckBox[0].setCheckState(2)
        elif zhuangtai == 0:
            self.clear()

    def clear(self):
        for i in range(self.row_num):
            self.qCheckBox[i].setChecked(False)

    def changeitemlist(self, itemlist):

        self.items = itemlist
        self.items.insert(0, '全部')
        self.row_num = len(self.items)

        self.Selectedrow_num = 0
        self.qCheckBox = []
        self.qLineEdit = QLineEdit()
        self.qLineEdit.setReadOnly(True)
        self.qListWidget = QListWidget()
        self.addQCheckBox(0)
        self.qCheckBox[0].stateChanged.connect(self.All)
        for i in range(1, self.row_num):
            self.addQCheckBox(i)
            self.qCheckBox[i].stateChanged.connect(self.show0)
        self.setModel(self.qListWidget.model())
        self.setView(self.qListWidget)
        self.setLineEdit(self.qLineEdit)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    mainWindow = ComboCheckBox(['装置ID', '传感器ID', "采样时间", '装置电源电压', "信号强度",'装置ID', '传感器ID', "采样时间", '装置电源电压', "信号强度"])
    def solt11(x):
        print(x)
    mainWindow.signa.connect(solt11)
    mainWindow.show()
    sys.exit(app.exec_())

原始代码来源于：https://blog.youkuaiyun.com/LJX4ever/article/details/78039318