方法1

在qtdesigner中设置按钮图标的三个属性，normal off 、normal on和checkable=true。

from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5 import uic
from switchBtn import Ui_Dialogclass Test(QDialog, Ui_Dialog):def __init__(self):super(Test, self).__init__()self.setupUi(self)if __name__ == "__main__":app = QApplication([])window = Test()window.show()app.exec_()

方法2，通过切换图片

from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5 import uicfrom switchBtn import Ui_Dialogclass Test(QDialog, Ui_Dialog):def __init__(self):super(Test, self).__init__()self.setupUi(self)# uic.loadUi("switchBtn.ui", self)self.pushButton.clicked.connect(self.toggleIcon2)self.pushButton.setEnabled(True)  # false是点不动按钮self.btn_clicked = Falsedef toggleIcon2(self):self.btn_clicked = not self.btn_clickedif self.btn_clicked:self.pushButton.setIcon(QIcon('switch_on.png'))else:self.pushButton.setIcon(QIcon('switch_off.png'))print(f"self.btn_clicked: {self.btn_clicked}")if __name__ == "__main__":app = QApplication([])window = Test()window.show()app.exec_()

c++qt版本

bool btn_clicked = false;

    connect(ui->switchBtn,&QPushButton::clicked,this,[this](){btn_clicked = !btn_clicked;if (btn_clicked) {ui->switchBtn->setIcon(QIcon(":/imgs/switch_on.png"));} else {ui->switchBtn->setIcon(QIcon(":/imgs/switch_off.png"));}qDebug()<<"btn_clicked:"<<btn_clicked;});