PyQt5 – 如何删除 ComboBox 中的所有项目？

在本文中，我们将看到如何清除组合框中的所有项目。我们知道我们可以在组合框中添加项目，通过addItem方法添加单个项目和addItems方法添加多个项目。为了删除组合框中的所有项目，我们将使用clear方法。

Syntax : combo_box.clear()

Argument : It takes no argument

Action performed : It will delete all the items of combo box

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.在action里面使用clear方法删除combo box的项目

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 to clear the list
        button = QPushButton("Clear", self)
  
        # adding action to button
        button.pressed.connect(self.delete)
  
    def delete(self):
  
        # delete items of list
        self.combo_box.clear()
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出：