pyqt5 实现在别的窗口弹出进度条

 # -*- coding: utf-8 -*-
##set progressbar
 
from PyQt5.QtWidgets import QApplication,QWidget,QDialog,QLabel,QLineEdit,QProgressBar,\
  QPushButton,QVBoxLayout,QHBoxLayout,QGridLayout,QDialogButtonBox
from PyQt5.QtCore import Qt, QBasicTimer, QThread
import sys
 
class ProgressBar(QDialog):
  def __init__(self, fileIndex,filenum,parent = None):
    super(ProgressBar, self).__init__(parent)
 
    self.resize(350,100)
    self.setWindowTitle(self.tr("Processing progress"))
 
    self.TipLabel = QLabel(self.tr("Processing:" + "  " + str(fileIndex) + "/" + str(filenum)))
    self.FeatLabel = QLabel(self.tr("Extract feature:"))
    
    self.FeatProgressBar = QProgressBar(self)
    self.FeatProgressBar.setMinimum(0)
    self.FeatProgressBar.setMaximum(100) #总进程换算为100

    self.FeatProgressBar.setValue(0) #进度条初始值为0
 
    TipLayout = QHBoxLayout()
    TipLayout.addWidget(self.TipLabel)
 
    FeatLayout = QHBoxLayout()
    FeatLayout.addWidget(self.FeatLabel)
    FeatLayout.addWidget(self.FeatProgressBar)
 
    # self.startButton = QPushButton('start',self)
    self.cancelButton = QPushButton('cancel', self)
    # self.cancelButton.setFocusPolicy(Qt.NoFocus)
 
    buttonlayout = QHBoxLayout()
    buttonlayout.addStretch(1)
    buttonlayout.addWidget(self.cancelButton)
    # buttonlayout.addStretch(1)
    # buttonlayout.addWidget(self.startButton)
 
    layout = QVBoxLayout()
    # layout = QGridLayout()
    layout.addLayout(FeatLayout)
    layout.addLayout(TipLayout)
    layout.addLayout(buttonlayout)
    self.setLayout(layout)
    self.show()
 
    # self.startButton.clicked.connect(self.setValue)
 
    self.cancelButton.clicked.connect(self.onCancel)
    # self.startButton.clicked.connect(self.onStart)
    # self.timer = QBasicTimer()
    # self.step = 0
 
  def setValue(self,value):
    self.FeatProgressBar.setValue(value) 
 
  def onCancel(self,event):
    self.close()
 
def main():
  app = QApplication(sys.argv)
  fileIndex = '3'  #当前正在处理第几个文件
  filenum = '10'  #文件总数，在label中显示
  progress = ProgressBar(fileIndex,filenum,0)
  progress.show()
  app.exec_()
 
if __name__ == '__main__':
  main()

self.ProgressBar = ProgressDialog.ProgressBar(self.FileIndex,self.VideoNum)

for i in range(n*step,(n+1)*step):
    # time.sleep(0.05)
    self.ProgressBar.setValue(i+1) #更新进度条的值
    QThread.msleep(int(self.ratio*100)) #模拟文件传送，进度条可以一点点增加，而不是一下增加很多，也可以不需要
    QApplication.processEvents() #实时显示

self.ProgressBar.close() #记得关闭进度条