QComboBox控件的作用
QcomcoBox控件通常用作下拉框选项，用于选择某个选项类别。
QComboBox控件常用方法
QComboBox控件常用信号
代码示例
# -*- coding: utf-8 -*- import sys from PyQt5.QtCore import * from PyQt5.QtGui import * from PyQt5.QtWidgets import * class ComboxDemo(QWidget): def __init__(self, parent=None): super(ComboxDemo, self).__init__(parent) self.setWindowTitle("combox 示例") self.resize(300, 90) layout = QVBoxLayout() self.lbl = QLabel("" ) self.cb = QComboBox() self.cb.addItem("C") self.cb.addItem("C++") self.cb.addItems(["Java", "C#", "Python"]) self.cb.currentIndexChanged.connect(self.selectionchange) layout.addWidget(self.cb) layout.addWidget(self.lbl ) self.setLayout(layout) def selectionchange(self,i): self.lbl.setText( self.cb.currentText() ) self.lbl.adjustSize() print( "Items in the list are :" ) for count in range(self.cb.count()): # 打印出所有的下拉框索引和名称 print( 'item'+str(count) + '='+ self.cb.itemText(count) ) print( "Current index",i,"selection changed ",self.cb.currentText() ) if __name__ == '__main__': app = QApplication(sys.argv) comboxDemo = ComboxDemo() comboxDemo.show() sys.exit(app.exec_())
代码运行结果：
选择一个选项后：
打印出的信息如下：
