PyQt5之QComboBox学习

QComboBox主要实现下拉列表，以及选中列表中元素的回调，回调方法和QPushButton类似，都是基于Qt的信号和槽实现。

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

import sys
from PyQt5.QtWidgets import (QApplication,QWidget,QLabel,QComboBox)

class Example(QWidget):

def __init__(self):
super().__init__()
self.initUI()

def initUI(self):

self.lbl = QLabel("MacOS",self)

combo = QComboBox(self)
combo.addItem("MacOs")
combo.addItem("Ubuntu")
combo.addItem("Fedora")
combo.addItem("Arch")
combo.addItem("Gentoo")

combo.move(50,50)
self.lbl.move(50,150)

combo.activated[str].connect(self.onActivated)

self.setGeometry(300,300,300,200)
self.setWindowTitle('QComboBox')
self.show()

def onActivated(self,text):

self.lbl.setText(text)
self.lbl.adjustSize()

if __name__ == '__main__':

app = QApplication(sys.argv)

ex = Example()

sys.exit(app.exec_())

 

结果如下：