使用 setCurrentText()函数来改变控件当前的显示文本，要注意该文本必须是已经添加到控件的文本，例程与效果如下所示：
# -*- coding: utf-8 -*- # Form implementation generated from reading ui file '下拉框联动.ui' # # Created by: PyQt5 UI code generator 5.11.3 # # WARNING! All changes made in this file will be lost! from PyQt5 import QtCore, QtGui, QtWidgets items_list = ["C", "C++", "Java", "Python", "JavaScript", "C#", "Swift", "go", "Ruby", "Lua", "PHP"] class Ui_MainWindow(object): def setupUi(self, MainWindow): MainWindow.setObjectName("MainWindow") MainWindow.resize(262, 162) self.centralwidget = QtWidgets.QWidget(MainWindow) self.centralwidget.setObjectName("centralwidget") self.comboBox = QtWidgets.QComboBox(self.centralwidget) self.comboBox.setGeometry(QtCore.QRect(20, 40, 69, 22)) self.comboBox.addItems(items_list) self.comboBox.activated.connect(lambda: self.to_comboBox_2(self.comboBox.currentText())) self.comboBox.setObjectName("comboBox") self.comboBox_2 = QtWidgets.QComboBox(self.centralwidget) self.comboBox_2.setGeometry(QtCore.QRect(150, 40, 69, 22)) self.comboBox_2.addItems(items_list) self.comboBox_2.setObjectName("comboBox_2") MainWindow.setCentralWidget(self.centralwidget) self.menubar = QtWidgets.QMenuBar(MainWindow) self.menubar.setGeometry(QtCore.QRect(0, 0, 262, 23)) self.menubar.setObjectName("menubar") MainWindow.setMenuBar(self.menubar) self.statusbar = QtWidgets.QStatusBar(MainWindow) self.statusbar.setObjectName("statusbar") MainWindow.setStatusBar(self.statusbar) self.retranslateUi(MainWindow) QtCore.QMetaObject.connectSlotsByName(MainWindow) def retranslateUi(self, MainWindow): _translate = QtCore.QCoreApplication.translate MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow")) def to_comboBox_2(self,text): print(text) self.comboBox_2.setCurrentText(text) if __name__=="__main__": import sys app = QtWidgets.QApplication(sys.argv) widget = QtWidgets.QMainWindow() ui = Ui_MainWindow() ui.setupUi(widget) widget.show() sys.exit(app.exec_())
