PyQt5 – 如何更改主窗口的背景颜色？

使用 PyQt 创建桌面应用程序的第一步是在桌面上显示一个窗口，在本文中，我们将了解如何更改此窗口的颜色。为了改变主窗口的颜色，我们使用setStylesheet()方法。

Syntax : setStyleSheet(“background-color: grey;”)

Argument : It takes string as an argument.

示例 #1：

# importing the required libraries
  
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore
from PyQt5.QtGui import * 
import sys
  
  
class Window(QMainWindow):
    def __init__(self):
        super().__init__()
  
        # changing the background color to yellow
        self.setStyleSheet("background-color: yellow;")
  
        # set the title
        self.setWindowTitle("Color")
  
        # setting  the geometry of window
        self.setGeometry(0, 0, 400, 300)
  
        # creating a label widget
        self.label = QLabel("Yellow", self)
  
        # moving position
        self.label.move(100, 100)
  
        # setting up border
        self.label.setStyleSheet("border: 1px solid black;")
  
  
  
        # show all the widgets
        self.show()
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：
示例 #2：

# importing the required libraries
  
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore
from PyQt5.QtGui import * 
import sys
  
  
class Window(QMainWindow):
    def __init__(self):
        super().__init__()
  
        # changing the background color to cyan
        self.setStyleSheet("background-color: cyan;")
  
        # set the title
        self.setWindowTitle("Color")
  
        # setting  the geometry of window
        self.setGeometry(0, 0, 400, 300)
  
        # creating a label widget
        self.label = QLabel("Cyan", self)
  
        # moving position
        self.label.move(100, 100)
  
        # setting up border
        self.label.setStyleSheet("border: 1px solid black;")
  
  
  
        # show all the widgets
        self.show()
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：