我的 QMessageBox 中有一个 if 语句，用于检查用户是否点击了 OK，但是当用户关闭 QMessageBox 时，由于某种原因，该语句为真（尽管用户没有点击 Ok）。

def update_msgbox(self):
        from PyQt5.QtWidgets import QLabel,QDialogButtonBox
        self.msg = QMessageBox()
        self.grid_layout = self.msg.layout()

        self.qt_msgboxex_icon_label = self.msg.findChild(QLabel,"qt_msgboxex_icon_label")
        self.qt_msgboxex_icon_label.deleteLater()

        self.qt_msgbox_label = self.msg.findChild(QLabel,"qt_msgbox_label")
        self.qt_msgbox_label.setalignment(Qt.AlignCenter)
        self.grid_layout.removeWidget(self.qt_msgbox_label)

        self.qt_msgbox_buttonbox = self.msg.findChild(QDialogButtonBox,"qt_msgbox_buttonbox")
        self.grid_layout.removeWidget(self.qt_msgbox_buttonbox)

        self.grid_layout.addWidget(self.qt_msgbox_label,alignment=Qt.AlignCenter)
        self.grid_layout.addWidget(self.qt_msgbox_buttonbox,1,alignment=Qt.AlignCenter)


        self.msg.setWindowTitle("  Software Update")
        self.msg.setText("A software update is available.<br>Do you want to update now?<br>")
        self.msg.setStandardButtons(QMessageBox.Ok)
        self.msg.setStyleSheet("QLabel{min-width: 200px;}")
        self.msg.setWindowIcon(QtGui.QIcon("CalculatorLogo(150p)_1.0.0.ico"))

        if self.msg.exec_() == QMessageBox.Ok:
                return True

        else: 
                return False