PyQt5 – 处于中间状态的按下复选框的背景颜色

在本文中，我们将看到如何在中间状态下按下复选框时将颜色设置为复选框。默认情况下，复选框的标签部分没有设置按下颜色，尽管默认情况下，指示器在按下时具有浅蓝色背景色。中间状态是介于已检查和未检查状态之间的状态状态，它是借助setTristate方法创建的第三种状态。

为了在从中间（不确定）状态按下时为复选框添加背景颜色，我们必须编辑与复选框对象一起使用的样式表代码。下面是样式表代码。

QCheckBox::indeterminate:pressed
{
background-color : cyan;
}

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 the check-box
        checkbox = QCheckBox('Geek ?', self)
  
        # setting tristate check box
        checkbox.setTristate(True)
  
        # setting geometry of check box
        checkbox.setGeometry(200, 150, 100, 30)
  
        # adding background color to the pressed check box label part
        # when it is in intermediate state
        checkbox.setStyleSheet("QCheckBox:indeterminate:pressed"
                               "{"
                               "background-color : cyan;"
                               "}")
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：