PyQt5 QSpinBox - 为向下按钮添加边框以实现反按下状态

在本文中，我们将了解如何在旋转框的向下按钮处于反按下状态时为它添加边框。旋转框由上下两个按钮组成，向下按钮用于减小值，虽然我们可以更改它，但它有自己的默认边框。自定义边框只有在不按下按钮时才会出现在向下按钮上，否则会出现正常边框。

为此，我们必须更改与旋转框关联的样式表代码，下面是样式表代码

QSpinBox::down-button:!pressed
{
border : 4px solid red;
}

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 spin box
        self.spin = QSpinBox(self)
  
        # setting geometry to spin box
        self.spin.setGeometry(100, 100, 250, 40)
  
        # setting prefix to spin
        self.spin.setPrefix("Prefix ")
  
        # setting suffix to spin
        self.spin.setSuffix(" Suffix")
  
        # setting style sheet to the spin box
        # adding border to the down button of spin box
        # and it is in anti pressed state
        self.spin.setStyleSheet("QSpinBox::down-button:! pressed"
                                "{"
                                "border : 4px solid red;"
                                "}")
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：