检查PyQt QPushButton是否使用自我发送者()

Question

QPushButtonlightsBtn是一个开关按钮，用于开关灯。当用户按下lightsBtn时，函数lightsBtnHandler将检查按钮当前是否被选中，并调用turnOnLights或{}。在

我认为self.sender()能够访问QPushButton的属性，但是我找不到任何关于访问选中状态的文档。在

有可能吗？在

class Screen(QMainWindow):

    def initUI(self):
        lightsBtn= QPushButton('Turn On')
        lightsBtn.setCheckable(True)  
        lightsBtn.setStyleSheet("QPushButton:checked {color: white; background-color: green;}")
        lightsBtn.clicked.connect(self.lightsBtnHandler)
        lightsBtn.show()

    def lightsBtnHandler(self):
        if self.sender().?? isChecked():    # How to check for checked state?
            self.turnOnLights()
        else:
            self.turnOffLights()

Answer 1

在@Matho注释之后，我对您的代码进行了一点修改。在

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

class Screen(QMainWindow):
    def __init__(self):
        super(Screen, self).__init__()
        self.initUI()

    def initUI(self):
        self.lightsBtn= QPushButton('Turn On')
        self.lightsBtn.setCheckable(True)  
        self.lightsBtn.setStyleSheet("QPushButton:checked {color: white; background-color: green;}")
        self.lightsBtn.clicked.connect(self.lightsBtnHandler)

        # probaply you will want to set self.lightsBtn 
        # at certain spot using layouts
        self.setCentralWidget(self.lightsBtn)

    def lightsBtnHandler(self):
        if self.lightsBtn.isChecked():
            self.turnOnLights()
        else:
            self.turnOffLights()

    def turnOnLights(self):
        print("truned on")

    def turnOffLights(self):
        print("truned off")

app = QApplication(sys.argv)
window = Screen()
window.show()
sys.exit(app.exec_())