PyQt5 - 按下时组合框向下箭头的背景颜色

在本文中，我们将看到如何在组合框被按下时为组合框的向下箭头设置背景颜色。向下箭头是组合框的按钮部分，按下时会打开项目的列表视图。

为了在按下向下箭头时为其添加颜色，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-color : lightgreen;
}

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, 150, 30)
  
        # making combo box editable
        self.combo_box.setEditable(True)
  
        # 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)
  
        # editing style sheet code of combo box
        # adding background color to the down arrow when it get pressed
        self.combo_box.setStyleSheet("QComboBox::down-arrow:pressed"
                                     "{"
                                     "background-color : lightgreen;"
                                     "}")
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：