小编给大家分享一下python3+PyQt5+Qt Designer如何实现扩展对话框，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！

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第一部分无借用Qt Designer，完全用代码实现。
第二部分则借用Qt Designer，快速实现。

第一部分：

import sys
from PyQt5.QtCore import Qt,pyqtSignal
from PyQt5.QtWidgets import (QApplication, QCheckBox, QDialog, QFrame,
  QGridLayout, QHBoxLayout, QLabel, QLayout, QLineEdit,
  QPushButton, QVBoxLayout)



class FindAndReplaceDlg(QDialog):
 find = pyqtSignal(str,bool,bool,bool,bool,bool)
 replace = pyqtSignal(str,str,bool,bool,bool,bool,bool)  

 def __init__(self, parent=None):
  super(FindAndReplaceDlg, self).__init__(parent)

  findLabel = QLabel("Find &what:")
  self.findLineEdit = QLineEdit()
  findLabel.setBuddy(self.findLineEdit)
  replaceLabel = QLabel("Replace w&ith:")
  self.replaceLineEdit = QLineEdit()
  replaceLabel.setBuddy(self.replaceLineEdit)
  self.caseCheckBox = QCheckBox("&Case sensitive")
  self.wholeCheckBox = QCheckBox("Wh&ole words")
  self.wholeCheckBox.setChecked(True)
  self.moreFrame = QFrame()
  self.moreFrame.setFrameStyle(QFrame.StyledPanel|QFrame.Sunken)
  self.backwardsCheckBox = QCheckBox("Search &Backwards")
  self.regexCheckBox = QCheckBox("Regular E&xpression")
  self.ignoreNotesCheckBox = QCheckBox("Ignore foot¬es "
             "and endnotes")
  line = QFrame()
  line.setFrameStyle(QFrame.VLine|QFrame.Sunken)
  self.findButton = QPushButton("&Find")
  self.replaceButton = QPushButton("&Replace")
  closeButton = QPushButton("Close")
  self.moreButton = QPushButton("&More")
  self.moreButton.setCheckable(True)


  gridLayout = QGridLayout()
  gridLayout.addWidget(findLabel, 0, 0)
  gridLayout.addWidget(self.findLineEdit, 0, 1)
  gridLayout.addWidget(replaceLabel, 1, 0)
  gridLayout.addWidget(self.replaceLineEdit, 1, 1)
  frameLayout = QVBoxLayout()
  frameLayout.addWidget(self.backwardsCheckBox)
  frameLayout.addWidget(self.regexCheckBox)
  frameLayout.addWidget(self.ignoreNotesCheckBox)
  self.moreFrame.setLayout(frameLayout)
  leftLayout = QVBoxLayout()
  leftLayout.addLayout(gridLayout)
  leftLayout.addWidget(self.caseCheckBox)
  leftLayout.addWidget(self.wholeCheckBox)
  leftLayout.addWidget(self.moreFrame)
  buttonLayout = QVBoxLayout()
  buttonLayout.addWidget(self.findButton)
  buttonLayout.addWidget(self.replaceButton)
  buttonLayout.addWidget(closeButton)
  buttonLayout.addWidget(self.moreButton)
  buttonLayout.addStretch()
  mainLayout = QHBoxLayout()
  mainLayout.addLayout(leftLayout)
  mainLayout.addWidget(line)
  mainLayout.addLayout(buttonLayout)
  self.setLayout(mainLayout)

  self.moreFrame.hide()
  mainLayout.setSizeConstraint(QLayout.SetFixedSize)

  self.moreButton.toggled[bool].connect(self.setvisible)


  self.findLineEdit.textEdited.connect(self.updateUi)
  self.findButton.clicked.connect(self.findClicked)
  self.replaceButton.clicked.connect(self.replaceClicked)

  self.updateUi()
  self.setWindowTitle("Find and Replace")

 def setvisible(self,YN):
  self.moreFrame.setVisible(YN)


 def findClicked(self):
  self.find.emit(self.findLineEdit.text(),
    self.caseCheckBox.isChecked(),
    self.wholeCheckBox.isChecked(),
    self.backwardsCheckBox.isChecked(),
    self.regexCheckBox.isChecked(),
    self.ignoreNotesCheckBox.isChecked())


 def replaceClicked(self):
  self.replace.emit(self.findLineEdit.text(),
    self.replaceLineEdit.text(),
    self.caseCheckBox.isChecked(),
    self.wholeCheckBox.isChecked(),
    self.backwardsCheckBox.isChecked(),
    self.regexCheckBox.isChecked(),
    self.ignoreNotesCheckBox.isChecked())


 def updateUi(self):
  enable = self.findLineEdit.text()
  self.findButton.setEnabled(bool(enable))
  self.replaceButton.setEnabled(bool(enable))


if __name__ == "__main__":

 def find(what, *args):
  print("Find {0} {1}".format(what, [x for x in args]))

 def replace(old, new, *args):
  print("Replace {0} with {1} {2}".format(
    old, new, [x for x in args]))

 app = QApplication(sys.argv)
 form = FindAndReplaceDlg()
 form.find.connect(find)
 form.replace.connect(replace)  
 form.show()
 app.exec_()

第二部分：

/home/yrd/eric_workspace/chap09/findandreplacedlg/Ui_findandreplacedlg.py

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file '/home/yrd/eric_workspace/chap09/findandreplacedlg/findandreplacedlg.ui'
#
# Created by: PyQt5 UI code generator 5.7
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_FindAndReplaceDlg(object):
 def setupUi(self, FindAndReplaceDlg):
  FindAndReplaceDlg.setObjectName("FindAndReplaceDlg")
  FindAndReplaceDlg.resize(355, 274)
  self.mainlayout = QtWidgets.QHBoxLayout(FindAndReplaceDlg)
  self.mainlayout.setSizeConstraint(QtWidgets.QLayout.SetFixedSize)
  self.mainlayout.setContentsMargins(9, 9, 9, 9)
  self.mainlayout.setSpacing(6)
  self.mainlayout.setObjectName("mainlayout")
  self.vboxlayout = QtWidgets.QVBoxLayout()
  self.vboxlayout.setContentsMargins(0, 0, 0, 0)
  self.vboxlayout.setSpacing(6)
  self.vboxlayout.setObjectName("vboxlayout")
  self.gridlayout = QtWidgets.QGridLayout()
  self.gridlayout.setContentsMargins(0, 0, 0, 0)
  self.gridlayout.setSpacing(6)
  self.gridlayout.setObjectName("gridlayout")
  self.replaceLineEdit = QtWidgets.QLineEdit(FindAndReplaceDlg)
  self.replaceLineEdit.setObjectName("replaceLineEdit")
  self.gridlayout.addWidget(self.replaceLineEdit, 1, 1, 1, 1)
  self.findLineEdit = QtWidgets.QLineEdit(FindAndReplaceDlg)
  self.findLineEdit.setObjectName("findLineEdit")
  self.gridlayout.addWidget(self.findLineEdit, 0, 1, 1, 1)
  self.label_2 = QtWidgets.QLabel(FindAndReplaceDlg)
  self.label_2.setObjectName("label_2")
  self.gridlayout.addWidget(self.label_2, 1, 0, 1, 1)
  self.label = QtWidgets.QLabel(FindAndReplaceDlg)
  self.label.setObjectName("label")
  self.gridlayout.addWidget(self.label, 0, 0, 1, 1)
  self.vboxlayout.addLayout(self.gridlayout)
  self.vboxlayout1 = QtWidgets.QVBoxLayout()
  self.vboxlayout1.setContentsMargins(0, 0, 0, 0)
  self.vboxlayout1.setSpacing(6)
  self.vboxlayout1.setObjectName("vboxlayout1")
  self.caseCheckBox = QtWidgets.QCheckBox(FindAndReplaceDlg)
  self.caseCheckBox.setObjectName("caseCheckBox")
  self.vboxlayout1.addWidget(self.caseCheckBox)
  self.wholeCheckBox = QtWidgets.QCheckBox(FindAndReplaceDlg)
  self.wholeCheckBox.setChecked(True)
  self.wholeCheckBox.setObjectName("wholeCheckBox")
  self.vboxlayout1.addWidget(self.wholeCheckBox)
  self.vboxlayout.addLayout(self.vboxlayout1)
  spacerItem = QtWidgets.QSpacerItem(231, 16, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding)
  self.vboxlayout.addItem(spacerItem)
  self.moreFrame = QtWidgets.QFrame(FindAndReplaceDlg)
  self.moreFrame.setFrameShape(QtWidgets.QFrame.StyledPanel)
  self.moreFrame.setFrameShadow(QtWidgets.QFrame.Raised)
  self.moreFrame.setObjectName("moreFrame")
  self.vboxlayout2 = QtWidgets.QVBoxLayout(self.moreFrame)
  self.vboxlayout2.setContentsMargins(9, 9, 9, 9)
  self.vboxlayout2.setSpacing(6)
  self.vboxlayout2.setObjectName("vboxlayout2")
  self.backwardsCheckBox = QtWidgets.QCheckBox(self.moreFrame)
  self.backwardsCheckBox.setObjectName("backwardsCheckBox")
  self.vboxlayout2.addWidget(self.backwardsCheckBox)
  self.regexCheckBox = QtWidgets.QCheckBox(self.moreFrame)
  self.regexCheckBox.setObjectName("regexCheckBox")
  self.vboxlayout2.addWidget(self.regexCheckBox)
  self.ignoreNotesCheckBox = QtWidgets.QCheckBox(self.moreFrame)
  self.ignoreNotesCheckBox.setObjectName("ignoreNotesCheckBox")
  self.vboxlayout2.addWidget(self.ignoreNotesCheckBox)
  self.vboxlayout.addWidget(self.moreFrame)
  self.mainlayout.addLayout(self.vboxlayout)
  self.line = QtWidgets.QFrame(FindAndReplaceDlg)
  self.line.setFrameShape(QtWidgets.QFrame.VLine)
  self.line.setFrameShadow(QtWidgets.QFrame.Sunken)
  self.line.setObjectName("line")
  self.mainlayout.addWidget(self.line)
  self.vboxlayout3 = QtWidgets.QVBoxLayout()
  self.vboxlayout3.setContentsMargins(0, 0, 0, 0)
  self.vboxlayout3.setSpacing(6)
  self.vboxlayout3.setObjectName("vboxlayout3")
  self.findButton = QtWidgets.QPushButton(FindAndReplaceDlg)
  self.findButton.setFocusPolicy(QtCore.Qt.NoFocus)
  self.findButton.setObjectName("findButton")
  self.vboxlayout3.addWidget(self.findButton)
  self.replaceButton = QtWidgets.QPushButton(FindAndReplaceDlg)
  self.replaceButton.setFocusPolicy(QtCore.Qt.NoFocus)
  self.replaceButton.setObjectName("replaceButton")
  self.vboxlayout3.addWidget(self.replaceButton)
  self.closeButton = QtWidgets.QPushButton(FindAndReplaceDlg)
  self.closeButton.setFocusPolicy(QtCore.Qt.NoFocus)
  self.closeButton.setObjectName("closeButton")
  self.vboxlayout3.addWidget(self.closeButton)
  self.moreButton = QtWidgets.QPushButton(FindAndReplaceDlg)
  self.moreButton.setFocusPolicy(QtCore.Qt.NoFocus)
  self.moreButton.setCheckable(True)
  self.moreButton.setObjectName("moreButton")
  self.vboxlayout3.addWidget(self.moreButton)
  spacerItem1 = QtWidgets.QSpacerItem(21, 16, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding)
  self.vboxlayout3.addItem(spacerItem1)
  self.mainlayout.addLayout(self.vboxlayout3)
  self.label_2.setBuddy(self.replaceLineEdit)
  self.label.setBuddy(self.findLineEdit)

  self.retranslateUi(FindAndReplaceDlg)
  self.closeButton.clicked.connect(FindAndReplaceDlg.reject)
  self.moreButton.toggled['bool'].connect(self.moreFrame.setVisible)
  QtCore.QMetaObject.connectSlotsByName(FindAndReplaceDlg)
  FindAndReplaceDlg.setTabOrder(self.findLineEdit, self.replaceLineEdit)
  FindAndReplaceDlg.setTabOrder(self.replaceLineEdit, self.caseCheckBox)
  FindAndReplaceDlg.setTabOrder(self.caseCheckBox, self.wholeCheckBox)
  FindAndReplaceDlg.setTabOrder(self.wholeCheckBox, self.backwardsCheckBox)
  FindAndReplaceDlg.setTabOrder(self.backwardsCheckBox, self.regexCheckBox)
  FindAndReplaceDlg.setTabOrder(self.regexCheckBox, self.ignoreNotesCheckBox)

 def retranslateUi(self, FindAndReplaceDlg):
  _translate = QtCore.QCoreApplication.translate
  FindAndReplaceDlg.setWindowTitle(_translate("FindAndReplaceDlg", "Find and Replace"))
  self.label_2.setText(_translate("FindAndReplaceDlg", "Replace w&ith:"))
  self.label.setText(_translate("FindAndReplaceDlg", "Find &what:"))
  self.caseCheckBox.setText(_translate("FindAndReplaceDlg", "&Case sensitive"))
  self.wholeCheckBox.setText(_translate("FindAndReplaceDlg", "Wh&ole words"))
  self.backwardsCheckBox.setText(_translate("FindAndReplaceDlg", "Search &Backwards"))
  self.regexCheckBox.setText(_translate("FindAndReplaceDlg", "Regular E&xpression"))
  self.ignoreNotesCheckBox.setText(_translate("FindAndReplaceDlg", "Ignore foot¬es and endnotes"))
  self.findButton.setText(_translate("FindAndReplaceDlg", "&Find"))
  self.replaceButton.setText(_translate("FindAndReplaceDlg", "&Replace"))
  self.closeButton.setText(_translate("FindAndReplaceDlg", "Close"))
  self.moreButton.setText(_translate("FindAndReplaceDlg", "&More"))

/home/yrd/eric_workspace/chap09/findandreplacedlg/findandreplacedlg.py

# -*- coding: utf-8 -*-

"""
Module implementing FindAndReplaceDlg.
"""

from PyQt5.QtCore import pyqtSlot,pyqtSignal
from PyQt5.QtWidgets import QDialog,QApplication

from Ui_findandreplacedlg import Ui_FindAndReplaceDlg


class FindAndReplaceDlg(QDialog, Ui_FindAndReplaceDlg):
 """
 Class documentation goes here.
 """
 find = pyqtSignal(str,bool,bool,bool,bool,bool)
 replace = pyqtSignal(str,str,bool,bool,bool,bool,bool)  
 def __init__(self, parent=None):
  """
  Constructor

  @param parent reference to the parent widget
  @type QWidget
  """
  super(FindAndReplaceDlg, self).__init__(parent)
  self.setupUi(self)
  self.moreFrame.hide()
  #self.layout().setSizeConstraint(QLayout.SetFixedSize)
  self.updateUi()  

 @pyqtSlot(str)
 def on_findLineEdit_textEdited(self, text):
  """
  Slot documentation goes here.

  @param p0 DESCRIPTION
  @type str
  """
  # TODO: not implemented yet
  self.updateUi()

 @pyqtSlot()
 def on_findButton_clicked(self):
  self.find.emit(self.findLineEdit.text(),
      self.caseCheckBox.isChecked(),
      self.wholeCheckBox.isChecked(),
      self.backwardsCheckBox.isChecked(),
      self.regexCheckBox.isChecked(),
      self.ignoreNotesCheckBox.isChecked())  


 @pyqtSlot()
 def on_replaceButton_clicked(self):
  self.replace.emit(self.findLineEdit.text(),
       self.replaceLineEdit.text(),
       self.caseCheckBox.isChecked(),
       self.wholeCheckBox.isChecked(),
       self.backwardsCheckBox.isChecked(),
       self.regexCheckBox.isChecked(),
       self.ignoreNotesCheckBox.isChecked())

 def updateUi(self):
  enable = self.findLineEdit.text()
  self.findButton.setEnabled(bool(enable))
  self.replaceButton.setEnabled(bool(enable))

if __name__ == "__main__":
 import sys

 def find(what, *args):
  print("Find {0} {1}".format(what, [x for x in args]))

 def replace(old, new, *args):
  print("Replace {0} with {1} {2}".format(
    old, new, [x for x in args]))

 app = QApplication(sys.argv)
 form = FindAndReplaceDlg()
 form.find.connect(find)
 form.replace.connect(replace)
 form.show()
 app.exec_()

运行结果：

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