PyQt5+Pycharm, QThread

一、创建窗体控件

untitled.ui： 

PushButton, PushButton_2, PushButton_3

lineEdit, lineEdit_2, lineEdit_3

二、编译窗体

自动生成untitled.py

三、新建py文件

myDemo.py

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow
from untitled import *
from PyQt5.QtCore import pyqtSlot, QThread, pyqtSignal
import time

class longTimeThread(QThread):
    number_singal = pyqtSignal(int, object)
    def __init__(self, object):
        super().__init__()
        self.object = object
    def run(self):
        for i in range(1000):
            self.number_singal.emit(i, self.object)
            time.sleep(0.1)

class MainWindow(QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setupUi(self)
        self.thread1 = longTimeThread(self.lineEdit_2)  # 创建一个线程
        self.thread2 = longTimeThread(self.lineEdit_3)  # 创建一个线程
        self.thread1.number_singal.connect(self.updates)
        self.thread2.number_singal.connect(self.updates)

    @pyqtSlot()
    def on_pushButton_clicked(self):
        self.lineEdit.setText('Hello World')

    @pyqtSlot()
    def on_pushButton_2_clicked(self):
        self.thread1.start()

    @pyqtSlot()
    def on_pushButton_3_clicked(self):
        self.thread2.start()

    def updates(self, number, object):
        object.setText(str(number))


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

四、运行

点击PushButton_2， 更新lineEdit_2, 每0.1s加1

点击PushButton_3， 更新lineEdit_3, 每0.1s加1

lineEdit_2和lineEdit_3的更新互不影响，窗体不会卡死。