pyqt 实现进度条窗口

# -*- coding: utf-8 -*-
from Mainform import Ui_Frame

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow,QFrame,QProgressDialog,QMessageBox,QWidget
from PyQt5.QtCore import QThread,pyqtSignal,QTime

class ProgressDg(QProgressDialog):
    def __init__(self):
        super().__init__()
        self.setModal(True)
        self.setWindowTitle("正在执行...")
        self.setAutoClose(True)

class UIForm(Ui_Frame):
    def __init__(self):
        self.initUI()
        self.i = 0

    def initUI(self):
        self.frame = QFrame()
        super().setupUi(self.frame)
        self.progressBar.hide()
        self.pushButton.clicked.connect(self.work)
        self.pushButton_2.clicked.connect(self.work)
        self.workThread=None
        self.frame.setVisible(True)

    def hide(self):
        self.workThread.stop()
        self.process.hide()
        widget = QWidget()
        QMessageBox.information(widget,"sss11","ssssaaa")

    def showDg(self):
        widget = QWidget()
        QMessageBox.information(widget,"sss","ssssaaa")

    def work(self):
        self.i +=1
        self.workThread=WorkThread()
        self.process = ProgressDg()
        self.process.canceled.connect(self.hide)
        self.workThread.trigger.connect(self.changProgressBar)


        self.workThread.start()
        self.workThread.finished.connect(self.showDg)

    def changProgressBar(self,value):
        if value==-1:
            self.process.hide()
        self.process.setValue(value)

class WorkThread(QThread):

    trigger = pyqtSignal(int)
    def __init__(self):
        super(WorkThread,self).__init__()
        self.stopFlag=0

    def run(self):
        for i in range(101):
            if self.stopFlag ==-1:
                self.trigger.emit(-1)
                break
            import time
            time.sleep(0.1)
            self.trigger.emit(i)
        self.exit(0)

    def stop(self):
        self.stopFlag=-1


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