QMessageBox的buttonClicked信号无法正常工作

Question

我想使用Qmessagebox来显示有关正在运行的计算的一些信息，并在我点击OK按钮时显示停止功能。然而，当我使用信号buttonClicked时，没有任何事情发生，并且从未调用与它连接的函数

这里有一个代码来说明我的问题：

from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
import sys

class SenderObject(QObject):
    something_happened = pyqtSignal( )

class myfunc():
    updateTime = SenderObject()
    def __init__(self):
        self.i = 0
        self.stop = True
    def run(self):
        while self.stop :
            self.i+=1
            if self.i%100 == 0:
                self.updateTime.something_happened.emit()
                print('infinit loop',self.i)


class SurfViewer(QMainWindow):
    def __init__(self, parent=None):
        super(SurfViewer, self).__init__()
        self.parent = parent
        self.setFixedWidth(200)
        self.setFixedHeight(200)
        self.wid = QWidget()
        self.setCentralWidget(self.wid)
        self.groups = QHBoxLayout() ####
        self.Run = QPushButton('Run')
        self.groups.addWidget(self.Run)
        self.wid.setLayout(self.groups)

        self.Run.clicked.connect(self.run)

        self.myfunc = myfunc()
        self.myfunc.updateTime.something_happened.connect(self.updateTime)

    def run(self):
        self.msg = QMessageBox()
        self.msg.setText('Click Ok to stop the loop')
        self.msg.setWindowTitle(" ")
        self.msg.setModal(False)
        self.msg.show()

        self.myfunc.run()
        self.msg.buttonClicked.connect(self.Okpressed)

    def Okpressed(self):
        self.myfunc.stop = False

    @pyqtSlot( )
    def updateTime(self ):
        self.msg.setText('Click Ok to stop the loop
i = '+str(self.myfunc.i))
        self.parent.processEvents()



if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = SurfViewer(app)
    ex.setWindowTitle('window')
    ex.show()
    sys.exit(app.exec_( ))

所以theself.msg.buttonClicked.connect(self.Okpressed)行从不调用函数Okpressed。因此，myfunc.run永远不会停止。有人可以帮忙吗？