22. PyQt6 QCheckBox

import sys
from PyQt6.QtWidgets import QApplication, QMainWindow, QCheckBox
from PyQt6.QtGui import QGuiApplication
from PyQt6.QtCore import Qt


class App(QMainWindow):

    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle("PyQt6 QCheckBox")

        cb = QCheckBox("显示标题", self)
        cb.move(20, 20)
        cb.toggle()
        cb.stateChanged.connect(self.changeTitle)

        self.setGeometry(100, 100, 400, 300)
        self.center()

    def changeTitle(self, state):
        if state == Qt.CheckState.Checked.value:
            self.setWindowTitle("PyQt6 QCheckBox")
        else:
            self.setWindowTitle(" ")

    def center(self):
        qr = self.frameGeometry()
        cp = QGuiApplication.primaryScreen().availableGeometry().center()
        qr.moveCenter(cp)
        self.move(qr.topLeft())


if __name__ == "__main__":
    app = QApplication(sys.argv)
    cls_app = App()
    cls_app.show()
    sys.exit(app.exec())