在pyqt5中使用停止按钮停止while循环

from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QPushButton
import sys

class MyWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle("Stop Button Example")

        self.layout = QVBoxLayout()
        self.button_start = QPushButton("Start")
        self.button_stop = QPushButton("Stop")
        self.layout.addWidget(self.button_start)
        self.layout.addWidget(self.button_stop)
        self.setLayout(self.layout)

        self.button_start.clicked.connect(self.startLoop)
        self.button_stop.clicked.connect(self.stopLoop)

        self.flag = False

    def startLoop(self):
        self.flag = True
        while self.flag:
            # 循环执行的代码
            print("Running...")

    def stopLoop(self):
        self.flag = False

if __name__ == '__main__':
    app = QApplication(sys.argv)
    widget = MyWidget()
    widget.show()
    sys.exit(app.exec())