How to use style sheets in PyQt5 to customize the appearance of an application?

In PyQt5, you can customize the appearance of your application using style sheets. Style sheets are similar to CSS syntax and can be used to change the appearance and layout of windows, buttons, labels, and other controls in the application.

Here’s a simple example demonstrating how to use style sheets in PyQt5 to customize the appearance of an application.

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton

class MyApp(QWidget):
    def __init__(self):
        super().__init__()
        
        self.initUI()
        
    def initUI(self):
        self.setGeometry(100, 100, 400, 300)
        self.setWindowTitle('Custom Stylesheet Example')
        
        btn = QPushButton('Click me!', self)
        btn.setGeometry(150, 150, 100, 50)
        
        # 使用样式表自定义按钮的外观
        btn.setStyleSheet('QPushButton {background-color: #4CAF50; color: white; border: 1px solid #4CAF50; border-radius: 5px;}')
        
        self.show()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = MyApp()
    sys.exit(app.exec_())

In this example, we create a basic window and add a button to it. We then use the setStylesheet method to apply a style sheet to the button, changing its background color, text color, and border style.

By utilizing style sheets, we can easily customize the appearance of our application, making it more attractive and personalized. It is possible to change the appearance of controls using different style sheets according to our preferences, thereby achieving a custom interface style.