【python】pyQT5中ComboBox的用法

pyQT5中ComboBox的用法

常用的方法

1、添加下拉选项

#添加一个下拉选项
self.comboBox.addItem("默认文本")
#从列表中添加下拉选项
self.comboBox.addItems(["文本1", "文本2", "文本3"])

2、设置显示项目

self.comboBox.setCurrentIndex(2)

3、获取选项中的索引

self.comboBox.currentIndex()

4、获取选中项的文本

self.comboBox.currentText()

常用的信号

1、activated

在用户选中一个下拉选项时发射

2、currentIndexChanged

在下拉选项索引发生改变时发射

例程

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'ex_combox.ui'
#
# Created by: PyQt5 UI code generator 5.15.4
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.


from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(744, 286)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.comboBox = QtWidgets.QComboBox(self.centralwidget)
        self.comboBox.setGeometry(QtCore.QRect(150, 20, 351, 51))
        self.comboBox.setObjectName("comboBox")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(150, 100, 341, 31))
        self.label.setObjectName("label")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 744, 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)

        self.comboBox.addItems(["文本1","文本2","文本3","文本4","文本5"])
        self.comboBox.setCurrentIndex(3)    # 设置默认显示的值,不设置则默认为0

        self.comboBox.currentIndexChanged.connect(self.show)    # 关联信号与槽

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.label.setText(_translate("MainWindow", ""))

    def show(self):
        self.label.setText("当前选择是第{}项,文本内容为:{}".format(self.comboBox.currentText(),self.comboBox.currentText()))

import sys

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()  # 创建窗体对象
    ui = Ui_MainWindow()  # 创建PyQt设计的窗体对象
    ui.setupUi(MainWindow)  # 调用窗体的方法对对象进行初始化设置
    MainWindow.show()  # 显示窗体
    sys.exit(app.exec_())  # 程序关闭时退出进程

运行效果:

【python】pyQT5中ComboBox的用法_第1张图片

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