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_())

来源：https://blog.csdn.net/wzxxtt62267018/article/details/80897185