python之线程通过信号pyqtSignal刷新ui的方法

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）

 Dialog
 
 
  
  0
  0
  585
  394
  
 
 
  Dialog
 
 
  
  
   230
   320
   75
   23
  
  
  
  timer_click
  
 
 
  
  
   70
   30
   441
   231
  
  
 
 
 
 
 
  pushButton
  clicked()
  Dialog
  timer_click()
  
  
   217
   229
  
  
   250
   241
  
  
 
 
 
 timer_click()
 

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

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