python3多线程更新pyqt5 UI

思路：主线程创建UI，将主线程的UI槽函数传给子线程，当子线程工作完成之后，发出信号，通知主线程的UI槽函数

代码：

import sys
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
import time

# 为窗口类添加信号
class BackendThread(QThread):
    update_date = pyqtSignal(str)

    def run(self):
        while True:
            data = QDateTime.currentDateTime()
            currentTime = data.toString("yyyy-MM-dd hh:mm:ss")
            self.update_date.emit(str(currentTime))
            time.sleep(1)

# 主线程
class ThreadUpdateUI(QDialog):
    def __init__(self):
        QDialog.__init__(self)
        self.setWindowTitle("多线程更新UI数据")
        self.resize(400,100)
        self.input = QLineEdit(self)
        # 绝对布局
        self.input.resize(400,100)
        self.initUI()

    def initUI(self):
        self.backend = BackendThread()
        self.backend.update_date.connect(self.handleDisplay)
        # 启动线程
        self.backend.start()

    def handleDisplay(self,data):
        self.input.setText(data)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    example = ThreadUpdateUI()
    example.show()
    sys.exit(app.exec_())