PyQt5 – 如何制作半透明标签？

在设计 GUI（图形用户界面）应用程序时，我们倾向于制作大量标签，但有时一些标签相互重叠，只有顶部的标签可见，这就是需要半透明标签的原因。

普通标签 vs 半透明标签 –

为了创建半透明标签，使用setStyleSheet()方法。

Syntax : label.setStyleSheet(“background-color: rgba(255, 255, 255, 10);”)
Here we are setting color using RGBA i.e transparency factor, 255 is completely opaque, and an alpha of 0 is completely transparent.

Argument: It takes string as argument.

Action performed : It makes the color of the label transparent.

代码 ：

# importing the required libraries
  
from PyQt5.QtWidgets import * 
from PyQt5.QtGui import * 
import sys
  
  
class Window(QMainWindow):
    def __init__(self):
        super().__init__()
  
        # set the title
        self.setWindowTitle("Label")
  
        # setting  the geometry of window
        self.setGeometry(0, 0, 400, 300)
  
        # creating a label widget
        # by default label will display at top left corner
        self.label_1 = QLabel('back', self)
  
        # moving position
        self.label_1.move(100, 100)
  
        # setting up border and background color
        self.label_1.setStyleSheet("background-color: lightgreen;
                                    border: 3px solid green")
  
        # creating a label widget
        # by default label will display at top left corner
        self.label_2 = QLabel('front', self)
  
  
        # moving position
        self.label_2.move(140, 100)
  
        # setting up border and background
        # color with transparency factor 
        self.label_2.setStyleSheet("border: 3px solid blue; 
                  background-color: rgba(0, 255, 255, 90);")
          
        # 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 ：