PyQt5 组合框 – 按下时的背景图像为向下箭头

在本文中，我们将了解如何在组合框被按下时将背景图像添加到组合框的向下箭头。向下箭头是组合框的组件，它充当用于显示列表视图的按钮。下拉箭头的背景图片只有在按下状态时才会出现。

为此，我们必须更改与组合框关联的样式表，下面是样式表代码

QComboBox::down-arrow:pressed
{
background-image : url(image.png);
}

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 check-able combo box object
        self.combo_box = QComboBox(self)
  
        # making combo box editable
        self.combo_box.setEditable(True)
  
        # setting geometry of combo box
        self.combo_box.setGeometry(200, 150, 200, 80)
  
        # geek list
        geek_list = ["Sayian", "Super Sayian", "Super Sayian 2", "Super Sayian B"]
  
        # adding list of items to combo box
        self.combo_box.addItems(geek_list)
  
        # setting style sheet of combo box
        # adding background image to the down arrow when it get pressed
        self.combo_box.setStyleSheet("QComboBox::down-arrow:pressed"
                                     "{"
                                     "background-image : url(logo.png);"
                                     "border : 1px solid black;"
                                     "}")
  
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
window.show()
  
# start the app
sys.exit(App.exec())

输出 ：