每点击一次按钮,弹出一个对话框(子窗口),同时开启一个子线程来执行任务并更新对话框内容,关闭对话框则关闭对应子线程

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1. 建立一个简单的主界面和一个自定义对话框

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
 def setupUi(self, MainWindow):
  MainWindow.setObjectName("MainWindow")
  MainWindow.resize(327, 303)
  self.centralwidget = QtWidgets.QWidget(MainWindow)
  self.centralwidget.setObjectName("centralwidget")
  self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
  self.gridLayout.setObjectName("gridLayout")
  spacerItem = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
  self.gridLayout.addItem(spacerItem, 0, 0, 1, 1)
  self.pushButton = QtWidgets.QPushButton(self.centralwidget)
  self.pushButton.setObjectName("pushButton")
  self.gridLayout.addWidget(self.pushButton, 0, 1, 1, 1)
  spacerItem1 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
  self.gridLayout.addItem(spacerItem1, 0, 2, 1, 1)
  MainWindow.setCentralWidget(self.centralwidget)
  self.menubar = QtWidgets.QMenuBar(MainWindow)
  self.menubar.setGeometry(QtCore.QRect(0, 0, 327, 23))
  self.menubar.setObjectName("menubar")
  MainWindow.setMenuBar(self.menubar)
  self.statusbar = QtWidgets.QStatusBar(MainWindow)
  self.statusbar.setObjectName("statusbar")
  MainWindow.setStatusBar(self.statusbar)

  self.retranslateUi(MainWindow)
  self.pushButton.clicked.connect(MainWindow.open_dialog)
  QtCore.QMetaObject.connectSlotsByName(MainWindow)

 def retranslateUi(self, MainWindow):
  _translate = QtCore.QCoreApplication.translate
  MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
  self.pushButton.setText(_translate("MainWindow", "多线程弹窗"))


class Ui_Dialog(object):
 def setupUi(self, Dialog):
  Dialog.setObjectName("Dialog")
  Dialog.resize(369, 128)
  self.gridLayout = QtWidgets.QGridLayout(Dialog)
  self.gridLayout.setObjectName("gridLayout")
  self.buttonBox = QtWidgets.QDialogButtonBox(Dialog)
  self.buttonBox.setOrientation(QtCore.Qt.Horizontal)
  self.buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.Cancel|QtWidgets.QDialogButtonBox.Ok)
  self.buttonBox.setObjectName("buttonBox")
  self.gridLayout.addWidget(self.buttonBox, 1, 0, 1, 1)
  self.progressBar = QtWidgets.QProgressBar(Dialog)
  self.progressBar.setProperty("value", 24)
  self.progressBar.setObjectName("progressBar")
  self.gridLayout.addWidget(self.progressBar, 0, 0, 1, 1)

  self.retranslateUi(Dialog)
  self.buttonBox.accepted.connect(Dialog.accept)
  self.buttonBox.rejected.connect(Dialog.reject)
  QtCore.QMetaObject.connectSlotsByName(Dialog)

 def retranslateUi(self, Dialog):
  _translate = QtCore.QCoreApplication.translate
  Dialog.setWindowTitle(_translate("Dialog", "Dialog"))

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