如何正确使用 QTimer 来更新标签？

如何解决如何正确使用 QTimer 来更新标签？

我使用 PyQt5 作为 gui。这里我有一个按钮可以生成随机数。我想每 500 毫秒生成一次随机数而不必按下按钮，因此我尝试使用 QTimer。我已经阅读了这个问题的多种解决方案，但它仍然对我不起作用。 这是我尝试制作的代码。我不知道我应该把 QTimer 放在哪里。使用此代码，我可以生成随机数，但之后程序停止工作。任何帮助都会非常感谢

from PyQt5 import QtCore,QtGui,QtWidgets
from PyQt5.QtCore import QTimer
import random
import os

class Ui_MainWindow(object):
    def setupUi(self,MainWindow):
        MainWindow.setobjectName("MainWindow")
        MainWindow.resize(598,386)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setobjectName("centralwidget")
        self.label1 = QtWidgets.QLabel(self.centralwidget)
        self.label1.setGeometry(QtCore.QRect(190,10,151,31))
        font = QtGui.QFont()
        font.setPointSize(12)
        font.setBold(True)
        font.setWeight(75)
        self.label1.setFont(font)
        self.label1.setobjectName("label1")

        self.label2 = QtWidgets.QLabel(self.centralwidget)
        self.label2.setGeometry(QtCore.QRect(80,100,111,21))
        self.label2.setobjectName("label2")

        self.label3 = QtWidgets.QLabel(self.centralwidget)
        self.label3.setGeometry(QtCore.QRect(250,101,21))
        self.label3.setobjectName("label3")

        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(170,170,231,51))
        self.pushButton.setobjectName("pushButton")

        self.label4 = QtWidgets.QLabel(self.centralwidget)
        self.label4.setGeometry(QtCore.QRect(126,270,331,41))
        self.label4.setobjectName("label4")

        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0,598,21))
        self.menubar.setobjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setobjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        #self.timer = QTimer()
        #self.timer.timeout.connect(self.random)
        #self.timer.start(500)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def updatelabel(self,MainWindow):
        self.timer = QTimer()
        self.timer.timeout.connect(self.random)
        self.timer.start(500)

    def clickMe(self,MainWindow):
        self.label4.setText("You pressed the button!")
        self.update(MainWindow)
        self.random(MainWindow)
        self.updatelabel(MainWindow)

    def update(self,MainWindow):
        self.label4.adjustSize()

    def random(self,MainWindow):
        value=random.random()
        self.label3.setText(str(value))
        #self.updatelabel(MainWindow)
        #time.sleep(0.5)   


    def retranslateUi(self,MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setwindowTitle(_translate("MainWindow","MainWindow"))
        self.label1.setText(_translate("MainWindow","Received DATAs"))
        self.label2.setText(_translate("MainWindow","TextLabel"))
        self.label3.setText(_translate("MainWindow","TextLabel"))
        self.pushButton.setText(_translate("MainWindow","PushButton"))
        self.label4.setText(_translate("MainWindow","TextLabel"))
        self.pushButton.clicked.connect(self.clickMe)



if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

我最终手动制作了一个gui，我可以得到我想要的结果

from PyQt5 import QtWidgets,QtCore,QtGui
from PyQt5.QtWidgets import QApplication,QMainWindow
import sys
import random
from PyQt5.QtCore import QTimer


class MyWindow(QMainWindow):
    def __init__(self):
        super(MyWindow,self).__init__()
        self.setGeometry(200,200,300,300)
        self.setwindowTitle("My Window Title")
        self.initUI()

    def initUI(self):
        self.label = QtWidgets.QLabel(self)
        self.label.setText("My First Label")
        self.label.move(50,50)

        self.label1 = QtWidgets.QLabel(self)
        self.label1.setText("Textlabel")
        self.label1.move(100,100)

        self.b1 = QtWidgets.QPushButton(self)
        self.b1.setText("Click me")
        self.b1.move(50,0)
        self.b1.clicked.connect(self.clicked)

    def clicked(self):
        self.label.setText("You pressed the button")
        self.random()
        self.update()
        self.timer = QTimer()
        self.timer.timeout.connect(self.random)
        self.timer.start(500)

    def random(self):
        value=random.random()
        self.label1.setText(str(value))


    def update(self):
        self.label.adjustSize()
        self.label1.adjustSize()

if __name__ =="__main__":
    app=QtWidgets.QApplication(sys.argv)
    win=MyWindow()

    win.show()
    sys.exit(app.exec_())