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add p34 QComboBox
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‎README.md‎

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# PyQt5基础教程(持续更新中。。。)
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* p34_QComboBox [源码下载](p34_QComboBox) [博文地址](https://xugaoxiang.com/2022/10/20/pyqt5-34-qcombobox/)
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* p33_窗口大小设置 [源码下载](p33_窗口大小设置) [博文地址](https://xugaoxiang.com/2022/10/06/pyqt5-33-window-size-setting/)
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* p32_主题美化之`qt-material` [源码下载](p32_主题美化qtmaterial) [博文地址](https://xugaoxiang.com/2022/09/23/pyqt5-32-qt-material/)

‎p34_QComboBox/main.py‎

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import sys
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from PyQt5.QtWidgets import QMainWindow, QApplication
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from ui import Ui_MainWindow
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class MainWindow(QMainWindow, Ui_MainWindow):
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def __init__(self, parent=None):
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super(MainWindow, self).__init__(parent)
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self.setupUi(self)
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# 增加单个选项
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self.comboBox.addItem("Python")
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self.comboBox.addItem("Java")
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# 增加多个选项
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self.comboBox.addItems(["C", "C++", "Javascript"])
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# 绑定信号和槽
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# 当下拉选项的index发生变化，才发射这个信号，比如连续选中同一个选项，这个信号就不会发射
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self.comboBox.currentIndexChanged.connect(self.on_item_selected)
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# 和currentIndexChanged不同的是，即使前后选择的是同一个选项，信号也会被发射
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self.comboBox.activated.connect(self.on_activated)
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# 当焦点在下拉选项上时，信号被发射，此时的index是已经被选中的选项的index，默认是0
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self.comboBox.highlighted.connect(self.on_highlighted)
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def on_item_selected(self):
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print("{}: {}, index={}, total count={}".format(self.label.text(), self.comboBox.currentText(), self.comboBox.currentIndex(), self.comboBox.count()))
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def on_activated(self):
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print('on_activated.')
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def on_highlighted(self):
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print('on_highlighted, index={}'.format(self.comboBox.currentIndex()))
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if __name__ == '__main__':
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app = QApplication(sys.argv)
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windows = MainWindow()
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windows.show()
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sys.exit(app.exec_())

‎p34_QComboBox/project.ui‎

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<?xml version="1.0" encoding="UTF-8"?>
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<ui version="4.0">
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<class>MainWindow</class>
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<widget class="QMainWindow" name="MainWindow">
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<property name="geometry">
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<rect>
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<x>0</x>
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<y>0</y>
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<width>768</width>
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<height>579</height>
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</rect>
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</property>
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<property name="windowTitle">
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<string>QComboBox示例</string>
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</property>
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<widget class="QWidget" name="centralwidget">
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<widget class="QComboBox" name="comboBox">
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<property name="geometry">
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<rect>
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<x>220</x>
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<y>170</y>
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<width>271</width>
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<height>61</height>
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</rect>
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</property>
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<property name="font">
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<font>
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<pointsize>14</pointsize>
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</font>
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</property>
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</widget>
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<widget class="QLabel" name="label">
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<property name="geometry">
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<rect>
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<x>230</x>
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<y>90</y>
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<width>251</width>
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<height>51</height>
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</rect>
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</property>
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<property name="font">
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<font>
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<pointsize>18</pointsize>
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</font>
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</property>
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<property name="text">
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<string>你最喜欢的编程语言是</string>
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</property>
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</widget>
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</widget>
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<widget class="QMenuBar" name="menubar">
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<property name="geometry">
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<rect>
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<x>0</x>
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<y>0</y>
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<width>768</width>
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<height>23</height>
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</rect>
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</property>
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</widget>
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<widget class="QStatusBar" name="statusbar"/>
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</widget>
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<resources/>
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<connections/>
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</ui>

‎p34_QComboBox/ui.py‎

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# -*- coding: utf-8 -*-
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# Form implementation generated from reading ui file '.\project.ui'
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#
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# Created by: PyQt5 UI code generator 5.15.4
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#
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# WARNING: Any manual changes made to this file will be lost when pyuic5 is
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# run again. Do not edit this file unless you know what you are doing.
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from PyQt5 import QtCore, QtGui, QtWidgets
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class Ui_MainWindow(object):
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def setupUi(self, MainWindow):
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MainWindow.setObjectName("MainWindow")
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MainWindow.resize(768, 579)
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self.centralwidget = QtWidgets.QWidget(MainWindow)
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self.centralwidget.setObjectName("centralwidget")
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self.comboBox = QtWidgets.QComboBox(self.centralwidget)
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self.comboBox.setGeometry(QtCore.QRect(220, 170, 271, 61))
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font = QtGui.QFont()
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font.setPointSize(14)
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self.comboBox.setFont(font)
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self.comboBox.setObjectName("comboBox")
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self.label = QtWidgets.QLabel(self.centralwidget)
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self.label.setGeometry(QtCore.QRect(230, 90, 251, 51))
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font = QtGui.QFont()
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font.setPointSize(18)
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self.label.setFont(font)
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self.label.setObjectName("label")
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MainWindow.setCentralWidget(self.centralwidget)
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self.menubar = QtWidgets.QMenuBar(MainWindow)
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self.menubar.setGeometry(QtCore.QRect(0, 0, 768, 23))
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self.menubar.setObjectName("menubar")
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MainWindow.setMenuBar(self.menubar)
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self.statusbar = QtWidgets.QStatusBar(MainWindow)
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self.statusbar.setObjectName("statusbar")
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MainWindow.setStatusBar(self.statusbar)
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self.retranslateUi(MainWindow)
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QtCore.QMetaObject.connectSlotsByName(MainWindow)
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def retranslateUi(self, MainWindow):
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_translate = QtCore.QCoreApplication.translate
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MainWindow.setWindowTitle(_translate("MainWindow", "QComboBox示例"))
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self.label.setText(_translate("MainWindow", "你最喜欢的编程语言是"))

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