pyqt5对用qt designer设计的窗体实现弹出子窗口的示例

1. 用qt designer编写主窗体，窗体类型是MainWindow，空白窗口上一个按钮。并转换成mainWindow.py

# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'f.ui'
#
# Created by: PyQt5 UI code generator 5.9
#
# WARNING! All changes made in this file will be lost!
from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_MainWindow(object):
  def setupUi(self, MainWindow):
    MainWindow.setObjectName("MainWindow")
    MainWindow.resize(800, 600)
    self.centralwidget = QtWidgets.QWidget(MainWindow)
    self.centralwidget.setObjectName("centralwidget")
    self.pushButton = QtWidgets.QPushButton(self.centralwidget)
    self.pushButton.setGeometry(QtCore.QRect(80, 90, 75, 23))
    self.pushButton.setObjectName("pushButton")
    MainWindow.setCentralWidget(self.centralwidget)
    self.retranslateUi(MainWindow)
    QtCore.QMetaObject.connectSlotsByName(MainWindow)
  def retranslateUi(self, MainWindow):
    _translate = QtCore.QCoreApplication.translate
    MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
    self.pushButton.setText(_translate("MainWindow", "PushButton"))

2. 用qt designer编写子窗体，窗体类型是Dialog, 空白窗口上一个按钮。并转换成childWindow.py

from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_Dialog(object):
  def setupUi(self, Dialog):
    Dialog.setObjectName("Dialog")
    Dialog.resize(400, 300)
    self.pushButton = QtWidgets.QPushButton(Dialog)
    self.pushButton.setGeometry(QtCore.QRect(160, 100, 75, 23))
    self.pushButton.setObjectName("pushButton")
    Dialog.setWindowFlags(QtCore.Qt.WindowStaysOnTopHint)  #设置窗体总显示在最上面
    self.retranslateUi(Dialog)
    QtCore.QMetaObject.connectSlotsByName(Dialog)
  def retranslateUi(self, Dialog):
    _translate = QtCore.QCoreApplication.translate
    Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
    self.pushButton.setText(_translate("Dialog", "PushButton"))

3 编写调用程序，这个重点，

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QDialog
from dust.mainWindow import *
from dust.childWindow import *
 
if __name__ == '__main__':
  app = QApplication(sys.argv)
  #实例化主窗口 
  main = QMainWindow() 
  main_ui = Ui_MainWindow()
  main_ui.setupUi(main )
  #实例化子窗口 
  child = QDialog()      
  child_ui = Ui_Dialog()
  child_ui.setupUi(child)
   
  #按钮绑定事件
  btn = main_ui.pushButton
  btn.clicked.connect( child.show ) 
   
  #显示
  main.show()
  sys.exit(app.exec_())

4. 上面的程序只是能显示了，要想添加自定义事件，还不行，加自定义事件，有一个办法是再封装一个类，主窗体和子窗体都如此。

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QDialog
from dust.mainWindow import *
from dust.childWindow import *
 
#mainWindow
class MyMainWindow(QMainWindow, Ui_MainWindow):
  def __init__(self):
    super(MyMainWindow,self).__init__()
    self.setupUi(self)
     
    self.setGeometry(0, 0, 1024, 600)
    self.setWindowTitle('main window')
         
     
  def paintEvent(self, event):
    painter = QPainter(self)
    pixmap = QPixmap("./image/bg.jpg")
    painter.drawPixmap(self.rect(),pixmap)
   
      
  def keyPressEvent(self, e):
      
    if e.key() == Qt.Key_Escape:
      self.close()
 
class ChildWindow(QDialog, Ui_Dialog):
  def __init__(self):
    super(ChildWindow,self).__init__()
    self.setupUi(self)
     
    self.setWindowTitle('child window')
     
    self.pushButton.clicked.connect( self.btnClick) #按钮事件绑定
 
  def btnClick(self): #子窗体自定义事件
    self.close()
 
if __name__ == '__main__':
  app = QApplication(sys.argv)
    
  main = MyMainWindow()
    
  child = ChildWindow()  
   
  btn = main.pushButton    #主窗体按钮事件绑定
  btn.clicked.connect( child.show ) 
   
  main.show()
  sys.exit(app.exec_())