python+pyqt5实现一个简单的定时器和信号槽

1.使用qt designer设计一个ui，

2.自动生成ui对应的py文件

3.创建一个子类，继承自动生成的py，因为每次自动生成都会覆盖

4.为按钮添加信号槽，实现点击退出

5.实现线程定时功能，动态更新界面控件

 

#main.py
import time
from PyQt5.QtCore import Qt, QThread, pyqtSignal, QDateTime


# 创建一个子线程
class UpdateThread(QThread):
    # 创建一个信号，触发时传递当前时间给槽函数
    update_data = pyqtSignal(str)

    def run(self):
        # 无限循环，每秒钟传递一次时间给UI
        while True:
            data = QDateTime.currentDateTime()
            currentTime = data.toString("yyyy-MM-dd hh:mm:ss")
            self.update_data.emit(str(currentTime))
            time.sleep(1)

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

# Form implementation generated from reading ui file 'qosmain.ui'
#
# Created by: PyQt5 UI code generator 5.15.9
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.

# qosmain.py

from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(744, 623)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(50, 70, 54, 12))
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(50, 190, 54, 12))
        self.label_2.setObjectName("label_2")
        self.label_3 = QtWidgets.QLabel(self.centralwidget)
        self.label_3.setGeometry(QtCore.QRect(50, 300, 54, 12))
        self.label_3.setObjectName("label_3")
        self.tb_Jitter = QtWidgets.QTextBrowser(self.centralwidget)
        self.tb_Jitter.setGeometry(QtCore.QRect(120, 50, 256, 51))
        self.tb_Jitter.setObjectName("tb_Jitter")
        self.tb_lost = QtWidgets.QTextBrowser(self.centralwidget)
        self.tb_lost.setGeometry(QtCore.QRect(120, 160, 256, 51))
        self.tb_lost.setObjectName("tb_lost")
        self.tb_bitrate = QtWidgets.QTextBrowser(self.centralwidget)
        self.tb_bitrate.setGeometry(QtCore.QRect(120, 280, 256, 51))
        self.tb_bitrate.setObjectName("tb_bitrate")
        self.btn_ok = QtWidgets.QPushButton(self.centralwidget)
        self.btn_ok.setGeometry(QtCore.QRect(80, 500, 75, 23))
        self.btn_ok.setCheckable(True)
        self.btn_ok.setChecked(True)
        self.btn_ok.setAutoDefault(False)
        self.btn_ok.setObjectName("btn_ok")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 744, 23))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)

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

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.label.setText(_translate("MainWindow", "抖动："))
        self.label_2.setText(_translate("MainWindow", "丢包数量："))
        self.label_3.setText(_translate("MainWindow", "码率："))
        self.btn_ok.setText(_translate("MainWindow", "确定"))

#childui.py
import sys
from qosmain import Ui_MainWindow
from PyQt5 import QtWidgets
from updatethread import UpdateThread
from PyQt5.QtCore import pyqtSlot

class childui(QtWidgets.QMainWindow,Ui_MainWindow):
    def __init__(self, parent=None):
        super(childui, self).__init__(parent=parent)
        self.setupUi(self)
        self.start()

    @pyqtSlot()
    def on_btn_ok_clicked(self):
        print("btn_ok被点击, 退出")
        sys.exit(0)

    def set_jitter(self, text):
        self.tb_Jitter.setText(text)

    def start(self):
        # 创建子线程
        self.subThread = UpdateThread()
        # 将子线程中的信号与timeUpdate槽函数绑定
        self.subThread.update_data.connect(self.timeUpdate)
        # 启动子线程（开始更新时间）
        self.subThread.start()

    # 被子线程的信号触发，更新一次时间
    def timeUpdate(self, data):
        self.tb_Jitter.setText(data)

#updatethread.py
import time
from PyQt5.QtCore import Qt, QThread, pyqtSignal, QDateTime


# 创建一个子线程
class UpdateThread(QThread):
    # 创建一个信号，触发时传递当前时间给槽函数
    update_data = pyqtSignal(str)

    def run(self):
        # 无限循环，每秒钟传递一次时间给UI
        while True:
            data = QDateTime.currentDateTime()
            currentTime = data.toString("yyyy-MM-dd hh:mm:ss")
            self.update_data.emit(str(currentTime))
            time.sleep(1)

参考资料

https://blog.youkuaiyun.com/huage926/article/details/128655195

https://www.cnblogs.com/leokale-zz/p/13131953.html

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