pyQt5实时刷新界面的示例

from PyQt5.QtCore import QThread , pyqtSignal, QDateTime , QObjectfrom PyQt5.QtWidgets import QApplication, QDialog, QLineEditimport timeimport sysclass BackendThread(QObject):  # 通过类成员对象定义信号  update_date = pyqtSignal(str)    # 处理业务逻辑  def run(self):    while True:      data = QDateTime.currentDateTime()      currTime = data.toString("yyyy-MM-dd hh:mm:ss")      self.update_date.emit( str(currTime) )      time.sleep(1)class Window(QDialog):  def __init__(self):    QDialog.__init__(self)    self.setWindowTitle('PyQt 5界面实时更新例子')    self.resize(400, 100)    self.input = QLineEdit(self)    self.input.resize(400, 100)    self.initUI()  def initUI(self):    # 创建线程    self.backend = BackendThread()    # 连接信号    self.backend.update_date.connect(self.handleDisplay)    self.thread = QThread()    self.backend.moveToThread(self.thread)    # 开始线程    self.thread.started.connect(self.backend.run)    self.thread.start()  # 将当前时间输出到文本框  def handleDisplay(self, data):    self.input.setText(data)if __name__ == '__main__':  app = QApplication(sys.argv)  win = Window()  win.show()   sys.exit(app.exec_())