pyqt5对用qt designer设计的窗体实现弹出子窗口

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_())