self.comboBox = QComboBox(self) self.comboBox.resize( 100 , 30 ) self.comboBox.move( 100 , 100 ) self.test() def test ( self ): ############################添加条目项############################### self.comboBox.addItem( "xx1" ) self.comboBox.addItem( "xx2" ) self.comboBox.addItem(QIcon( "icon/view.png" ), "xx3" ) self.comboBox.addItems([ "xx1" , "xx2" , "xx3" ]) ############################添加条目项############################### if __name__ == '__main__' : app =QApplication(sys.argv) window = Window() window.show() sys.exit(app.exec_()) 添加条目项

插入 （指定位置插入）

设置 （替换）

from PyQt5.Qt import * #刚开始学习可以这样一下导入 import sys class Window ( QWidget ): def __init__ ( self ): super ().__init__() self.setWindowTitle( "QComboBox的学习" ) self.resize( 400 , 400 ) self.set_ui() def set_ui ( self ): self.comboBox = QComboBox(self) self.comboBox.resize( 100 , 30 ) self.comboBox.move( 100 , 100 ) self.test() def test ( self ): ############################插入条目项############################### self.comboBox.addItems([ "xx1" , "xx2" , "xx3" ]) self.comboBox.insertItem( 1 ,QIcon( "icon/view.png" ), "xxx4" ) # self.comboBox.insertItems() ############################设置条目############################### self.comboBox.setItemIcon( 2 ,QIcon( "icon/xiaoxio.png" )) self.comboBox.setItemText( 3 , "fsadjffajs" ) ############################删除条目项############################### # self.comboBox.removeItem(3) ############################删除条目项############################### self.comboBox = QComboBox(self) self.comboBox.resize( 100 , 30 ) self.comboBox.move( 100 , 100 ) self.test() def test ( self ): self.comboBox.addItems([ "xx1" , "xx2" , "xx3" ]) ############################设置分割线############################### self.comboBox.insertSeparator( 2 ) # 表示在2的前面加 ############################设置 当前选项############################### self.comboBox.setCurrentIndex( 3 ) ############################设置 编辑文本############################### self.comboBox.setEditable( True ) # 需要这个开启下面两个才会生效 # self.comboBox.setEditText("zzzzz") #设置文本 # self.comboBox.setCurrentText("11111") # 同上 self.comboBox = QComboBox(self) self.comboBox.resize( 200 , 30 ) self.comboBox.move( 100 , 100 ) self.test() def test ( self ): """表示把下拉框设置成树型""" qtv=QTreeView() self.comboBox.setView(qtv) model=qtv.model() # 表示添加树的根 # model = QStandardItemModel() # 下面这种也可以 # print(QAbstractItemModel.__subclasses__()) self.comboBox.setModel(model) # ---------------------设置选项-------------------------------- # 1- 添加所有的选项 item1 = QStandardItem( "item1" ) item2 = QStandardItem( "item2" ) item22 = QStandardItem( "item22" ) item23 = QStandardItem(QIcon( "icon/view.png" ), "item23" ) # 2- 把选项放在树上 model.appendRow(item1) model.appendRow(item2) item2.appendRow(item22) item2.appendRow(item23) # ---------------------设置选项-------------------------------- self.comboBox = QComboBox(self) self.comboBox.resize( 200 , 30 ) self.comboBox.move( 100 , 100 ) self.test() def test ( self ): """表示把下拉框设置成多选形式""" qw=QListWidget() self.comboBox.setView(qw) self.comboBox.setModel(qw.model()) # self.comboBox.setLineEdit(QLineEdit()) # 决定有没有第一行输入框 # ---------------------设置选项-------------------------------- """1设置第一个选项""" qItem = QListWidgetItem(qw) qb1 = QCheckBox() qb1.setText( "试试" ) qw.setItemWidget(qItem, qb1) """2设置第二个选项""" qItem2 = QListWidgetItem(qw) qb2 = QCheckBox() qb2.setText( "再试试" ) qw.setItemWidget(qItem2, qb2) # ---------------------设置选项--------------------------------

comboBox.count() 获取选项数

comboBox.currentIndex() 获取当前选中项索引

comboBox.currentText() 获取当前选中项内容

comboBox.itemIcon(int index) --> QIcon 下面的例子是获取到，然后放到按钮上

comboBox.itemText(4) - 获取指定索引选项

comboBox.itemData(4) 获取指定索引选项

from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QComboBox的学习")
        self.resize(400,400)
        self.set_ui()
    def set_ui(self):
        self.comboBox = QComboBox(self)
        self.comboBox.resize(100,30)
        self.comboBox.move(100,100)
        self.test()
        btn = QPushButton(self)
        btn.setText("按钮")
        btn.move(0,300)
        # btn.clicked.connect(lambda :print(self.comboBox.count()))
        # btn.clicked.connect(lambda :print(self.comboBox.currentIndex()))
        # btn.clicked.connect(lambda :print(self.comboBox.currentText()))
        btn.clicked.connect(lambda :print(self.comboBox.itemText(4)))       # 获取指定索引  显示文本
        btn.clicked.connect(lambda :print(self.comboBox.itemData(4)))       # 获取指定索引  data
        # 获取Qicon，然后放到按钮身上
        # btn.clicked.connect(lambda :btn.setIcon(self.comboBox.itemIcon(self.comboBox.currentIndex())))
        #小技巧1.---- self.comboBox.count()-1 表示最后一个选项索引
        btn.clicked.connect(lambda _,idx = self.comboBox.count()-1:print(self.comboBox.itemIcon(idx)))
                 #小技巧1 的解析
        last_one=self.comboBox.count()-1
        btn.clicked.connect(lambda :print(self.comboBox.itemIcon(last_one)))
    def test(self):
        self.comboBox.addItems(["xx1","xx2","xx3"])
        self.comboBox.insertItem(1,QIcon("icon/view.png"),"xxx4")
        self.comboBox.addItem(QIcon("icon/xiaoxio.png"),"fajsd",{"name":"tom"})
if __name__ == '__main__':
    app =QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())
六、选项限制
.setMaxCount(3)
.maxCount()
选项可见范围个数
.setMaxVisibleItems(10)
.maxVisibleItems()
from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QComboBox的学习")
        self.resize(400,400)
        self.set_ui()
    def set_ui(self):
        self.comboBox = QComboBox(self)
        self.comboBox.resize(100,30)
        self.comboBox.move(100,100)
        self.test()
        btn = QPushButton(self)
        btn.setText("按钮")
        btn.move(0,300)
        btn.clicked.connect(lambda :self.comboBox.addItem("xxx"))
    def test(self):
        self.comboBox.addItems(["xx1","xx2","xx3"])
        self.comboBox.insertItem(1,QIcon("icon/view.png"),"xxx4")
        ############################数据的限制###############################
        self.comboBox.setMaxCount(3)
        print(self.comboBox.maxCount())
        self.comboBox.setMaxVisibleItems(10)  #一屏可以显示的个数
        print(self.comboBox.maxVisibleItems())
        ############################数据的限制###############################
if __name__ == '__main__':
    app =QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())
七、其他操作
设置为可编辑
允许编辑内容
设置为可重复
设置图标大小
from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QComboBox的学习")
        self.resize(400,400)
        self.set_ui()
    def set_ui(self):
        self.comboBox = QComboBox(self)
        self.comboBox.resize(100,30)
        self.comboBox.move(100,100)
        self.test()
    def test(self):
        self.comboBox.addItem(QIcon("icon/view.png"),"xx3")
        self.comboBox.addItems(["xx1","xx2","xx3"])
        # 可编辑
        self.comboBox.setEditable(True)
        print("是否可编辑",self.comboBox.isEditable())
        # 可重复 (不知道什么用)
        self.comboBox.setDuplicatesEnabled(True)
        print("是否可编辑",self.comboBox.duplicatesEnabled())
        # 没有框架-默认为True
        # self.comboBox.setFrame(False)
        print(self.comboBox.hasFrame())
        # 设置图标大小
        self.comboBox.setIconSize(QSize(60, 60))
if __name__ == '__main__':
    app =QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())
弹开下拉框
它的用途是，自己自定义一个控制，然后通过点击自定义的也能弹出下拉框

comboBox.showPopup()




    

from PyQt5.Qt import *  # 刚开始学习可以这样一下导入
import sys
class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QComboBox的学习")
        self.resize(400, 400)
        self.set_ui()
    def set_ui(self):
        self.comboBox = QComboBox(self)
        self.comboBox.resize(100, 30)
        self.comboBox.move(100, 100)
        self.test()
        btn = QPushButton(self)
        btn.setText("按钮")
        btn.move(0, 300)
        btn.clicked.connect(self.slot_test)
    def slot_test(self):
        ############################设置弹出列表###############################
        self.comboBox.showPopup()
        # 它的用途是，自己自定义一个控制，然后通过点击自定义的也能弹出下拉框
    def test(self):
        self.comboBox.addItems(["xx1", "xx2", "xx3"])
        self.comboBox.insertItem(1, QIcon("icon/view.png"), "xxx4")
        self.comboBox = QComboBox(self)
        self.comboBox.resize(100, 30)
        self.comboBox.move(100, 100)
        self.test()
        btn = QPushButton(self)
        btn.setText("清空所有项目")
        btn.move(0, 300)
        btn.clicked.connect(self.slot_test)
        btn1 = QPushButton(self)
        btn1.setText("清空编辑的文本")
        btn1.move(100, 300)
        btn1.clicked.connect(self.slot_test2)
    def slot_test(self):
        self.comboBox.clear()  #清空所有项目
    def slot_test2(self):
        self.comboBox.clearEditText()  #清空编辑的文本
    def test(self):
        self.comboBox.addItems(["xx1", "xx2", "xx3"])
        self.comboBox.insertItem(1, QIcon("icon/view.png"), "xxx4")
        ############################尺寸调整策略###############################
        self.comboBox.setSizeAdjustPolicy(QComboBox.AdjustToContents)  # 参照最长的长度
        # self.comboBox.setSizeAdjustPolicy(QComboBox.AdjustToContentsOnFirstShow)  # 根据第一次显示 来适应
        # self.comboBox.setSizeAdjustPolicy(QComboBox.AdjustToMinimumContentsLength)
        # self.comboBox.setSizeAdjustPolicy(QComboBox.AdjustToMinimumContentsLengthWithIcon)
        self.comboBox.setEditable(True)
if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())
输入时支持搜索（完成器）
from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QComboBox的学习")
        self.resize(400,400)
        self.set_ui()
    def set_ui(self):
        self.comboBox = QComboBox(self)
        self.comboBox.resize(100,30)
        self.comboBox.move(100,100)
        self.test()
        btn = QPushButton(self)
        btn.setText("按钮")
        btn.move(0,300)
        btn.clicked.connect(self.slot_test)
    def slot_test(self):
    def test(self):
        self.comboBox.addItems(["xx1","xx2","bb3","cc4"])
        self.comboBox.setEditable(True)
        self.comboBox.setCompleter(QCompleter(["xx1","xx2","bb3"]))
        #注意：完成器中的内容一般要和 下拉框中的条目一致  ，这样可以达到快速的匹配
        self.comboBox = QComboBox(self)
        self.comboBox.resize(100,30)
        self.comboBox.move(100,100)
        self.test()
        btn = QPushButton(self)
        btn.setText("按钮")
        btn.move(0,300)
        btn.clicked.connect(self.slot_test)
    def slot_test(self):
    def test(self):
        self.comboBox.addItems(["xx1","xx2","xx3"])
        self.comboBox.setEditable(True)
        ############################信号###############################
        """被选中信号（手动选时）"""
        # 1.被选中信号：activated       默认释放的参数：为被选中的索引值
        self.comboBox.activated.connect(lambda val:print("选项被选中",val))      # 信号信号的参数 为  被选中的索引值
        # self.comboBox.activated.connect(lambda val:print("条目被激活",self.comboBox.itemText(val)))  # 拓展（这样就和下面一样了）
        # 2.被选中信号2：activated[str]         释放的参数：为被选中的 显示文本
        self.comboBox.activated[str].connect(lambda val:print("选项被选中",val))
        """选中选项发生改变（手动去改变，或代码改变时）"""
        # 以上两个信号仅仅是和用户交互的时候发射的信号，如果此时用代码改变，它不会发射信号
        # 如果也想检测到用代码改变的事件，用下面：
        self.comboBox.currentIndexChanged.connect(lambda val:print(f"当前索引发生改变变成{val}"))
        self.comboBox.currentIndexChanged[str].connect(lambda val:print(f"当前选项值发生改变变成{val}"))
        """当前的文本发生改变时（编辑）"""
        self.comboBox.currentTextChanged.connect(lambda val:print("当前文本发生改变",val)) #编辑的时候改变
        self.comboBox.editTextChanged.connect(lambda val:print("当前编辑文本发生改变",val))  # 和上面差不多
        """高亮发生改变时（悬停时，就改变）"""
        self.comboBox.highlighted.connect(lambda val:print("高亮发生改变",val))
if __name__ == '__main__':
    app =QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())
九、两级下拉选项案例
'版本1'
from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QComboBox 的案例")
        self.resize(400,400)
        self.city_dict= {
            "河南":{
                "郑州":"001",
                "开封":"002",
                "洛阳":"003",
                "南阳":"004",
            "江西":{
                "南昌":"005",
                "福州":"006",
                "乾州":"007",
                "上海":"008",
            "广东":{
                "广州":"009",
                "深圳":"010",
                "湛江":"011",
                "佛山":"012",
        self.set_ui()
    def set_ui(self):
        #1创建两个下拉框控件
        pro = QComboBox(self)
        city = QComboBox(self)
        self.city = city
        pro.move(100,100)
        city.move(200,100)
        # 2，展示数据到第一个下拉框
        pro.addItems(self.city_dict.keys())
        # 3，触发一下函数，展示数据到第二个下拉框
        self.pro_currentIndexChanged_slot(pro.currentText())
        #3 监听第一个下拉列表里面的当前值  发生改变的信号---------->去改变第二个下拉框
        pro.currentIndexChanged[str].connect(self.pro_currentIndexChanged_slot)
        #5 监听第二个列表中发生改变的信号------------------>去打印当前选中的 值
        city.currentIndexChanged[int].connect(self.city_currentIndexChanged_slot)
    def pro_currentIndexChanged_slot(self,pro_name):
        # print(pro_name)
        #4,根据第一个的名称来获取对应城市列表
        self.city.clear()
        cities = self.city_dict[pro_name]
        # self.city.addItems(cities)
        for key,val in cities.items():  #这种有自己的Userdata  它可用索引获取data
            # print(key,val)
            self.city.addItem(key,val)
    def city_currentIndexChanged_slot(self,idx):
        # print("第二个列表发生改变的时候",idx)
        userData = self.city.itemData(idx)
        if userData != None:
            print(userData)
if __name__ == '__main__':
    app =QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())
版本1以上代码存在点问题





    
from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QComboBox 的案例")
        self.resize(400,400)
        self.city_dict = {
            "河南": {
                "郑州": "001",
                "开封": "002",
                "洛阳": "003",
                "南阳": "004",
            "江西": {
                "南昌": "005",
                "福州": "006",
                "乾州": "007",
                "上海": "008",
            "广东": {
                "广州": "009",
                "深圳": "010",
                "湛江": "011",
                "佛山": "012",
        self.set_ui()
    def set_ui(self):
        #1创建两个下拉框控件
        pro = QComboBox(self)
        city = QComboBox(self)
        self.city = city
        pro.move(100,100)
        city.move(200,100)
        #3 监听第一个下拉列表里面的当前值  发生改变的信号
        pro.currentIndexChanged[str].connect(self.pro_currentIndexChanged_slot)
        #5 监听第二个列表中发生改变的信号
        city.currentIndexChanged[int].connect(self.city_currentIndexChanged_slot)
        # 2，展示数据到第一个下拉框
                     #一定要注意要先连接信号，然后再去添加数据，不然第一个就无法触发
        pro.addItems(self.city_dict.keys())
    def pro_currentIndexChanged_slot(self,pro_name):
        # print(pro_name)
        #4,根据第一个的名称来获取对应城市列表
        self.city.blockSignals(True)
        self.city.clear()  # 第二种解决None 产生的方法，当clear 时 ，将信号临时阻断
        self.city.blockSignals(False)
        cities = self.city_dict[pro_name]
        # self.city.addItems(cities)
        for key,val in cities.items():  #这种有自己的Userdata  它可用索引获取data
            self.city.addItem(key,val)
    def city_currentIndexChanged_slot(self,idx):
        # print("第二个列表发生改变的时候",idx)
        userData = self.city.itemData(idx)
        # if userData != None:  #第一种解决None 的方法
        #     print(userData)
        print(userData)
if __name__ == '__main__':
    app =QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())
十、QComboBox相关子类
from PyQt5.Qt import * #刚开始学习可以这样一下导入
import sys
class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QFontComboBox 的学习")
        self.resize(400,400)
        self.set_ui()
    def set_ui(self):
        label = QLabel(self)
        label.setText("我爱中国")
        label.move(100,100)
        fontComboBox = QFontComboBox(self)
        #一个重要的信号
        # fontComboBox.currentFontChanged.connect(lambda font:print(font))
        fontComboBox.currentFontChanged.connect(lambda font:label.setFont(font))
        fontComboBox.setEditable(False)
if __name__ == '__main__':
    app =QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())
十一、扩展封装多选组件
from PyQt5.QtWidgets import QComboBox, QLineEdit, QListWidget, QCheckBox, QListWidgetItem, QApplication
from PyQt5.QtCore import pyqtSignal
class ComboCheckBox(QComboBox):
    1.将show函数改成show_items
    2.增加changeitemlist函数
    3.增加信号signa
    signa = pyqtSignal(list)
    def __init__(self):
        super(ComboCheckBox, self).__init__()
        self.items = ['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.outputlist = []
        self.selected_id = []
        self.addQCheckBox(0)
        self.qCheckBox[0].stateChanged.connect(self.select_all)
        for i in range(1, self.row_num):
            self.addQCheckBox(i)
            self.qCheckBox[i].stateChanged.connect(self.show_selected)
        self.setModel(self.qListWidget.model())
        self.setView(self.qListWidget)
        self.setLineEdit(self.qLineEdit)
        # 避免滑条的出现引起滑条偷吃标签的问题
        self.setMaxVisibleItems(100)
    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):
        self.outputlist = []
        self.selected_id = []
        for i in range(1, self.row_num):
            if self.qCheckBox[i].isChecked():
                self.selected_id.append(i)
                self.outputlist.append(self.qCheckBox[i].text())
        self.Selectedrow_num = len(self.outputlist)
        return self.outputlist
    def show_selected(self):
        show_items = ''
        self.Selectlist()
        self.signa.emit(self.outputlist)
        # print(self.outputlist)
        self.qLineEdit.setReadOnly(False)
        self.qLineEdit.clear()
        for item in self.outputlist:
            show_items += item + ';'
        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_items[:-1])
        self.qLineEdit.setReadOnly(True)
    def select_all(self, status):
        if status == 2:
            for i in range(1, self.row_num):
                self.qCheckBox[i].setChecked(True)
        elif status == 1:
            if self.Selectedrow_num == 0:
                self.qCheckBox[0].setCheckState(2)
        elif status == 0:
            self.clear()
    def clear(self):
        for i in range(self.row_num):
            self.qCheckBox[i].setChecked(False)
    def change_item_list(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.select_all)
        for i in range(1, self.row_num):
            self.addQCheckBox(i)
            self.qCheckBox[i].stateChanged.connect(self.show_selected)
        self.setModel(self.qListWidget.model())
        self.setView(self.qListWidget)
        self.setLineEdit(self.qLineEdit)
if __name__ == "__main__":
    import sys, time
    app = QApplication(sys.argv)
    mainWindow = ComboCheckBox()
        # def solt11(x):
    #     print(x)
    # mainWindow.signa.connect(solt11)
    mainWindow.show()
    mainWindow.change_item_list(['装置ID1', '传感器ID1', "采样时间1", '装置电源电压1', "信号强度1",'装置ID2', '传感器ID2', "采样时间2", '装置电源电压2', "信号强度3",'装置ID3', '传感器ID3', "采样时间3", '装置电源电压3', "信号强度4"])
    sys.exit(app.exec_())
    成都_陶木木
       
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