PyQt5 – 更改 ComboBox 中特定索引处的项目

在本文中，我们将看到如何更改组合框中特定索引处的项目内容。为此，我们将使用setItemText方法。

Syntax : combo_box.setItemText(index, item)

Argument : It takes two argument one is integer and second is string

Action performed : This will change the content at that specific index

实施步骤——

1.创建一个组合框
2. 将项目添加到组合框
3.创建按钮
4. 为按钮添加动作
5.创建标签以显示以前的文本
5. 在动作内部使用 setItemText 方法更改给定索引处的项目内容

下面是实现——

# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys
  
  
class Window(QMainWindow):
  
    def __init__(self):
        super().__init__()
  
        # setting title
        self.setWindowTitle("Python ")
  
        # setting geometry
        self.setGeometry(100, 100, 600, 400)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for widgets
    def UiComponents(self):
  
        # creating a combo box widget
        self.combo_box = QComboBox(self)
  
        # setting geometry of combo box
        self.combo_box.setGeometry(200, 150, 120, 30)
  
        # geek list
        geek_list = ["Geek", "Geeky Geek", "Legend Geek", "Ultra Legend Geek"]
  
        # adding list of items to combo box
        self.combo_box.addItems(geek_list)
  
        # creating push button
        button = QPushButton("Change content ", self)
  
        print(self.combo_box.count())
  
        # adding action to button
        button.pressed.connect(self.find)
  
        # creating label
        self.label = QLabel(self)
  
        # setting geometry of the label
        self.label.setGeometry(200, 200, 200, 30)
  
        # old content at index 2
        content = self.combo_box.itemText(2)
  
        # showing the old content
        self.label.setText("old content  : content")
  
    def find(self):
  
        # index
        index = 2
  
        # changing the content
        self.combo_box.setItemText(index, "New data")
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出：