PyQt5高频刷新label样例Demo

实现效果是一个0-100之间的随机数字，高频在label中不断刷新，不会导致界面卡顿

control_refresh.py

#!/usr/bin/env python
# encoding: utf-8
'''
@author: JHC 
@license: None
@contact: JHC000abc@gmail.com
@file: control_refresh.py
@time: 2022/07/20/ 18:50
@desc:
'''
from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtCore import Qt, pyqtSignal
import refresh_ui
import numpy as np
from threading import Thread
import time


class ExitWindow(QWidget):
    refresh_single = pyqtSignal(int)
    def __init__(self):
        QWidget.__init__(self)
        self.ui = refresh_ui.Ui_Form()
        self.ui.setupUi(self)
        self.refresh_single.connect(self.label_show)

        Thread(target=self.send).start()

    def label_show(self,num):
        self.ui.label.setText("")
        self.ui.label.setText(str(num))

    def send(self):
        while True:
            num = np.random.randint(1, 101, 1)[0]
            time.sleep(0.001)
            self.refresh_single.emit(num)
                
                


if __name__ == "__main__":
    import sys
    app = QApplication(sys.argv)
    myForm = ExitWindow()
    myForm.show()
    sys.exit(app.exec())

refresh_ui.py

# -*- coding: utf-8 -*-


from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(620, 570)
        self.gridLayout = QtWidgets.QGridLayout(Form)
        self.gridLayout.setObjectName("gridLayout")
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setObjectName("horizontalLayout")
        spacerItem = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.horizontalLayout.addItem(spacerItem)
        self.verticalLayout = QtWidgets.QVBoxLayout()
        self.verticalLayout.setObjectName("verticalLayout")
        spacerItem1 = QtWidgets.QSpacerItem(20, 40, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding)
        self.verticalLayout.addItem(spacerItem1)
        self.label = QtWidgets.QLabel(Form)
        self.label.setStyleSheet("font: 75 24pt "Agency FB";n"
"color: rgb(255, 0, 0);")
        self.label.setObjectName("label")
        self.verticalLayout.addWidget(self.label, 0, QtCore.Qt.AlignHCenter)
        spacerItem2 = QtWidgets.QSpacerItem(20, 40, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding)
        self.verticalLayout.addItem(spacerItem2)
        self.verticalLayout.setStretch(0, 10)
        self.verticalLayout.setStretch(1, 5)
        self.verticalLayout.setStretch(2, 10)
        self.horizontalLayout.addLayout(self.verticalLayout)
        spacerItem3 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.horizontalLayout.addItem(spacerItem3)
        self.horizontalLayout.setStretch(0, 1)
        self.horizontalLayout.setStretch(1, 10)
        self.horizontalLayout.setStretch(2, 1)
        self.gridLayout.addLayout(self.horizontalLayout, 0, 0, 1, 1)

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

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.label.setText(_translate("Form", "show_label"))