PyQt5 QLabel 根据用户指令禁用不透明效果

在这篇文章中，我们将看到如何根据用户的指令禁用标签的不透明效果，这样，当用户选中单选按钮时，不透明效果就会消失，当用户取消单选按钮时，它又会出现。为了使不透明效果失效和启用，我们使用setEnabled方法。

为了做到这一点，我们必须做以下工作：1.创建一个标签 2.创建一个不透明效果对象，并将其设置到标签上 3.创建一个单选按钮 4.给单选按钮添加动作 5.在动作中检查单选按钮是否被选中，如果被选中则使不透明效果失效 6.否则就启用不透明效果

语法： opacity_effect.setEnabled(False)

参数： 以bool作为参数

返回： 不返回。

以下是实现方法

# 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 label
        label = QLabel("Label", self)
 
        # setting geometry to the label
        label.setGeometry(200, 100, 150, 60)
 
        # setting alignment to the label
        label.setAlignment(Qt.AlignCenter)
 
        # setting font
        label.setFont(QFont('Arial', 15))
 
        # setting style sheet of the label
        label.setStyleSheet("QLabel"
                            "{"
                            "border : 2px solid green;"
                            "background : lightgreen;"
                            "}")
 
        # creating a opacity effect
        self.opacity_effect = QGraphicsOpacityEffect()
 
        # setting opacity level
        self.opacity_effect.setOpacity(0.3)
 
        # adding opacity effect to the label
        label.setGraphicsEffect(self.opacity_effect)
 
        # creating a radio button
        self.button = QRadioButton("Disable opacity effect", self)
 
        # setting geometry
        self.button.setGeometry(200, 200, 300, 30)
 
        # adding action to the button
        self.button.clicked.connect(self.do_something)
 
    # action called by the radio button
    def do_something(self):
 
        # radio is checked ?
        if self.button.isChecked() == True:
 
            # making opacity effect disable
            self.opacity_effect.setEnabled(False)
 
        else:
            # making opacity color effect enable
            self.opacity_effect.setEnabled(True)
 
 
# create pyqt5 app
App = QApplication(sys.argv)
 
# create the instance of our Window
window = Window()
 
# start the app
sys.exit(App.exec())