PyQt5 - 按下按钮时显示 ComboBox 的弹出项

在本文中，我们将了解如何制作组合框以显示其元素而无需单击它。为此，我们将使用showPopup方法。

Syntax : combo_box.showPopup()

Argument : It takes no argument

Action performed : It will show the pop up elements

实施步骤：

1.创建一个组合框
2.在组合框中添加项目
3.创建一个按钮
4.向按钮添加动作，以便在按下时调用方法
5. 在方法内部使用showPopup方法显示弹出窗口。

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("Click !", self)
  
        # adding action to the button
        button.pressed.connect(self.action)
  
    def action(self):
  
        # showing the pop up
        self.combo_box.showPopup()
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：

点击按钮后