在PyQt5中使用QThread的时候，要注意把所有QThread的对象在主类中的init(或者放在所有类函数的外面)中进行实例化，不然可能在多个QThread互相调用的时候，emit重复的信号。一般比较正确的写法如下所示，基本照着这种框架搭建都是没问题的。

# -*- coding: utf-8 -*-import sysimport timefrom PyQt5.QtWidgets import *from PyQt5.QtCore import * class MainUi(QWidget): def __init__(self): super(MainUi, self).__init__() self.resize(400, 200) self.setWindowTitle('QThread例子') # 实例化多线程对象 self.thread = Worker() # 实例化列表控件与按钮控件 self.listFile = QListWidget() self.btnStart = QPushButton('开始') self.btn_over = QPushButton('结束') # 把控件放置在栅格布局中 layout = QGridLayout(self) layout.addWidget(self.listFile, 0, 0, 1, 2) layout.addWidget(self.btnStart, 1, 0) layout.addWidget(self.btn_over, 1, 1) # 信号与槽函数的连接 self.btnStart.clicked.connect(self.slotStart) self.btn_over.clicked.connect(self.slot_btn_over) # 建立线程信号的槽连接 self.thread.trigger.connect(self.slotAdd) def slotAdd(self, msg): print(msg) if int(msg) % 2 == 0: self.listFile.addItem(msg) else: pass self.thread.exit() def slotStart(self): self.btnStart.setEnabled(False) self.thread.start() def slot_btn_over(self): self.btnStart.setEnabled(True) self.thread.terminate() self.thread.num = 0 class Worker(QThread): trigger = pyqtSignal(str) num = 0 def __init__(self): super(Worker, self).__init__() def run(self): while True: print('num= ', self.num) if self.num % 2 == 0: self.trigger.emit(str(50)) elif self.num == 200: self.num = 0 else: pass time.sleep(0.1) self.num += 1 if __name__ == '__main__': app = QApplication(sys.argv) w = MainUi() w.show() sys.exit(app.exec_())

以上这篇pyqt5中QThread在使用时出现重复emit的实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。