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由于做项目时需要用到多选框（UI使用的是PyQt5），选项比较多，使用复选框不合适，所以在网上找了资料，浏览到一篇帖子（忘记帖子链接了，希望原作者看到后不要介意）自定义下拉复选框，觉得非常有用，就分享一下（直接复制代码就可以使用），废话不多说，直接上代码：

# 自定义下拉复选框
class ComboCheckBox(QComboBox):
    def loadItems(self, items):
        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(0, self.row_num):
            self.addQCheckBox(i)
            self.qCheckBox[i].stateChanged.connect(self.showMessage)
        self.setModel(self.qListWidget.model())
        self.setView(self.qListWidget)
        self.setLineEdit(self.qLineEdit)

    def showPopup(self):
        #  重写showPopup方法，避免下拉框数据多而导致显示不全的问题
        select_list = self.Selectlist()  # 当前选择数据
        self.loadItems(items=self.items[1:])  # 重新添加组件
        for select in select_list:
            index = self.items[:].index(select)
            self.qCheckBox[index].setChecked(True)  # 选中组件
        return QComboBox.showPopup(self)

    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 showMessage(self):
        Outputlist = self.Selectlist()
        self.qLineEdit.setReadOnly(False)
        self.qLineEdit.clear()
        show = ';'.join(Outputlist)

        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(show)
        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 currentText(self):
        text = QComboBox.currentText(self).split(';')
        if text.__len__() == 1:
            if not text[0]:
                return []
        return text

UI中只需要定义好选项列表，再添加进复选框中就行

items_target = ['1', '2', '...']  # 选项列表
self.data_target_cobx = ComboCheckBox(self.centralwidget)
''' 其它代码 '''
self.data_target_cobx.loadItems(items_target)