PyQt5组合框 按下时为向下箭头设置边框样式

在这篇文章中，我们将看到如何在按下箭头时为其设置边框样式。基本上，当我们为向下箭头设置边框时，它是一个简单的边框，尽管我们可以改变它的风格。

为了做到这一点，我们必须改变与组合框相关的样式表，下面是样式表的代码

QComboBox::down-arrow::pressed
{
border : 4px black;
border-style : dotted;
}

下面是执行情况

# 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)

        # setting geometry of combo box
        self.combo_box.setGeometry(200, 150, 150, 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
        # adding border to down arrow
        # setting border style to it when it get pressed
        self.combo_box.setStyleSheet("QComboBox::down-arrow"
                                     "{"
                                     "border : 2px solid black;"
                                     "}"
                                     "QComboBox::down-arrow:pressed"
                                     "{"
                                     "border-style : dotted;"
                                     "}")


# create pyqt5 app
App = QApplication(sys.argv)

# create the instance of our Window
window = Window()

# start the app
sys.exit(App.exec())