pyqt5使用QTimer,QThread,pyqtSignal实现自动执行，多线程，自定义信号触发。

from PyQt5 import QtCore, QtGui, QtWidgetsclass Ui_MainWindow(object):def setupUi(self, MainWindow):MainWindow.setObjectName("MainWindow")MainWindow.resize(640, 320)self.centralwidget &＃61; QtWidgets.QWidget(MainWindow)self.centralwidget.setObjectName("centralwidget")self.textBrowser &＃61; QtWidgets.QTextBrowser(self.centralwidget)self.textBrowser.setGeometry(QtCore.QRect(0, 0, 320, 320))self.textBrowser.setObjectName("textBrowser")self.pushButton &＃61; QtWidgets.QPushButton(self.centralwidget)self.pushButton.setGeometry(QtCore.QRect(450, 150, 75, 23))self.pushButton.setObjectName("pushButton")MainWindow.setCentralWidget(self.centralwidget)self.retranslateUi(MainWindow)self.pushButton.clicked.connect(MainWindow.start)QtCore.QMetaObject.connectSlotsByName(MainWindow)def retranslateUi(self, MainWindow):_translate &＃61; QtCore.QCoreApplication.translateMainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))self.pushButton.setText(_translate("MainWindow", "开始"))

import sys, time
from PyQt5 import QtWidgets
from PyQt5.QtCore import QTimer, QThread, pyqtSignal
from mainwindow import Ui_MainWindowclass MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):def __init__(self, parent&＃61;None):super(MainWindow, self).__init__(parent&＃61;parent)self.setupUi(self)def start(self):time.sleep(2)self.textBrowser.append(&＃39;test1&＃39;)if __name__ &＃61;&＃61; "__main__":app &＃61; QtWidgets.QApplication(sys.argv)w &＃61; MainWindow()w.show()sys.exit(app.exec_())

import sys, time
from PyQt5 import QtWidgets
from PyQt5.QtCore import QTimer, QThread, pyqtSignal
from mainwindow import Ui_MainWindowclass MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):def __init__(self, parent&＃61;None):super(MainWindow, self).__init__(parent&＃61;parent)self.setupUi(self)# 初始化一个定时器self.timer &＃61; QTimer(self)# 定义时间超时连接start_app
self.timer.timeout.connect(self.start)# 定义时间任务是一次性任务
self.timer.setSingleShot(True)# 启动时间任务
self.timer.start()def start(self):time.sleep(2)self.textBrowser.append(&＃39;test1&＃39;)if __name__ &＃61;&＃61; "__main__":app &＃61; QtWidgets.QApplication(sys.argv)w &＃61; MainWindow()w.show()sys.exit(app.exec_())

import sys, time
from PyQt5 import QtWidgets
from PyQt5.QtCore import QTimer, QThread, pyqtSignal
from mainwindow import Ui_MainWindowclass MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):def __init__(self, parent&＃61;None):super(MainWindow, self).__init__(parent&＃61;parent)self.setupUi(self)# 初始化一个定时器self.timer &＃61; QTimer(self)# 定义时间超时连接start_app
self.timer.timeout.connect(self.start)# 定义时间任务是一次性任务
self.timer.setSingleShot(True)# 启动时间任务
self.timer.start()# 实例化一个线程self.work &＃61; WorkThread()# 多线程的信号触发连接到UpText
self.work.trigger.connect(self.UpText)def start(self):# time.sleep(2)# self.textBrowser.append(&＃39;test1&＃39;)# 启动另一个线程
self.work.start()def UpText(self, str):time.sleep(2)self.textBrowser.append(&＃39;test2&＃39;)class WorkThread(QThread):# 定义一个信号trigger &＃61; pyqtSignal(str)def __int__(self):# 初始化函数&＃xff0c;默认super(WorkThread, self).__init__()def run(self):time.sleep(5)# 等待5秒后&＃xff0c;给触发信号&＃xff0c;并传递testself.trigger.emit(&＃39;test2&＃39;)if __name__ &＃61;&＃61; "__main__":app &＃61; QtWidgets.QApplication(sys.argv)w &＃61; MainWindow()w.show()sys.exit(app.exec_())