python之线程通过信号pyqtSignal刷新ui的方法

第一部分：UI界面设计

界面效果图如下：

ui文件(可拉动控件自行创建一个button和text）

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>Dialog</class>
<widget class="QDialog" name="Dialog">
<property name="geometry">
 <rect>
 <x>0</x>
 <y>0</y>
 <width>585</width>
 <height>394</height>
 </rect>
</property>
<property name="windowTitle">
 <string>Dialog</string>
</property>
<widget class="QPushButton" name="pushButton">
 <property name="geometry">
 <rect>
  <x>230</x>
  <y>320</y>
  <width>75</width>
  <height>23</height>
 </rect>
 </property>
 <property name="text">
 <string>timer_click</string>
 </property>
</widget>
<widget class="QTextEdit" name="textEdit">
 <property name="geometry">
 <rect>
  <x>70</x>
  <y>30</y>
  <width>441</width>
  <height>231</height>
 </rect>
 </property>
</widget>
</widget>
<resources/>
<connections>
<connection>
 <sender>pushButton</sender>
 <signal>clicked()</signal>
 <receiver>Dialog</receiver>
 <slot>timer_click()</slot>
 <hints>
 <hint type="sourcelabel">
  <x>217</x>
  <y>229</y>
 </hint>
 <hint type="destinationlabel">
  <x>250</x>
  <y>241</y>
 </hint>
 </hints>
</connection>
</connections>
<slots>
<slot>timer_click()</slot>
</slots>
</ui>

生成的py文件

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

# Form implementation generated from reading ui file 'TEST_QT_FROM.ui'
#
# Created by: PyQt5 UI code generator 5.11.3
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Dialog(object):
 def setupUi(self, Dialog):
   Dialog.setObjectName("Dialog")
   Dialog.resize(585, 394)
   self.pushButton = QtWidgets.QPushButton(Dialog)
   self.pushButton.setGeometry(QtCore.QRect(230, 320, 75, 23))
   self.pushButton.setObjectName("pushButton")
   self.textEdit = QtWidgets.QTextEdit(Dialog)
   self.textEdit.setGeometry(QtCore.QRect(70, 30, 441, 231))
   self.textEdit.setObjectName("textEdit")

self.retranslateUi(Dialog)
   self.pushButton.clicked.connect(Dialog.timer_click)
   QtCore.QMetaObject.connectSlotsByName(Dialog)

def retranslateUi(self, Dialog):
   _translate = QtCore.QCoreApplication.translate
   Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
   self.pushButton.setText(_translate("Dialog", "timer_click"))

第二部分：主要逻辑代码

from PyQt5 import QtWidgets, QtCore
from testqt.TEST_QT_FROM import Ui_Dialog
import sys
from PyQt5.QtCore import *
import time

# 继承QThread
class Runthread(QtCore.QThread):
 # python3,pyqt5与之前的版本有些不一样
 # 通过类成员对象定义信号对象
 _signal = pyqtSignal(str)

def __init__(self):
   super(Runthread, self).__init__()

def __del__(self):
   self.wait()

def run(self):
   print("run 666")
   self._signal.emit("run 666"); # 信号发送

class TestQtFromC(QtWidgets.QWidget, Ui_Dialog):
 text =""
 def __init__(self):
   super(TestQtFromC, self).__init__()
   self.setupUi(self)

#click
 def timer_click(self):
   self.thread = Runthread() # 创建线程
   self.thread._signal.connect(self.callbacklog) # 连接信号
   self.thread.start() # 开始线程

# callback
 def callbacklog(self, msg):
   self.text =self.text+time.strftime("％Y-％m-％d ％H:％M:％S ", time.localtime())+msg+ "\n"
   print(self.text)
   # 回调数据输出到文本框
   self.textEdit.setText(self.text);

if __name__ == "__main__":
 app = QtWidgets.QApplication(sys.argv)
 mTestQtFromC = TestQtFromC()
 mTestQtFromC.show()
 sys.exit(app.exec_())

第三部分：运行效果图

点击click就可刷新界面了

来源：https://blog.csdn.net/IKNOWNU/article/details/83790074