PyQt5多线程刷新界面防假死示例

from PyQt5 import QtWidgets, QtCore
import sys
from PyQt5.QtCore import *
import time
 
 
# 继承QThread
class Runthread(QtCore.QThread):
  # 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):
    for i in range(100):
      time.sleep(0.2)
      self._signal.emit(str(i)) # 注意这里与_signal = pyqtSignal(str)中的类型相同
 
 
class Example(QtWidgets.QWidget):
 
  def __init__(self):
    super().__init__()
    # 按钮初始化
    self.button = QtWidgets.QPushButton('开始', self)
    self.button.setToolTip('这是一个 <b>QPushButton</b> widget')
    self.button.resize(self.button.sizeHint())
    self.button.move(120, 80)
    self.button.clicked.connect(self.start_login) # 绑定多线程触发事件
 
    # 进度条设置
    self.pbar = QtWidgets.QProgressBar(self)
    self.pbar.setGeometry(50, 50, 210, 25)
    self.pbar.setValue(0)
 
    # 窗口初始化
    self.setGeometry(300, 300, 300, 200)
    self.setWindowTitle('OmegaXYZ.com')
    self.show()
 
    self.thread = None # 初始化线程
 
  def start_login(self):
    # 创建线程
    self.thread = Runthread()
    # 连接信号
    self.thread._signal.connect(self.call_backlog) # 进程连接回传到GUI的事件
    # 开始线程
    self.thread.start()
 
  def call_backlog(self, msg):
    self.pbar.setValue(int(msg)) # 将线程的参数传入进度条
 
 
if __name__ == "__main__":
  app = QtWidgets.QApplication(sys.argv)
  myshow = Example()
  myshow.show()
  sys.exit(app.exec_())