PyQT5 QTDesigner窗口及组成的实现

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget

from ui3 import Ui_MainWindow


class MyWindow(QMainWindow):
  def __init__(self):
    super(MyWindow, self).__init__()

  # 重写close槽函数
  def close(self):
    print("这里我们重写一下主窗口的close方法")
    super(MyWindow, self).close()

  # 调用App.quit()来退出程序
  def quitApp(self):
    app = QApplication.instance()
    print("退出整个程序")
    app.quit()


if __name__ == '__main__':
  # 创建一个App实例
  app = QApplication(sys.argv)
  # 创建一个主窗口
  mainWin = MyWindow()
  # 使用我们生成的UI窗口实例
  ui = Ui_MainWindow()
  # 将主窗口传递进去，让Ui_MainWindow帮我们向主窗口上放置组件
  ui.setupUi(mainWin)
  # 显示
  mainWin.show()

  # 主循环
  sys.exit(app.exec_())

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'ui3.ui'
#
# Created by: PyQt5 UI code generator 5.14.2
#
# 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(1264, 886)
    sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Preferred)
    sizePolicy.setHorizontalStretch(1)
    sizePolicy.setVerticalStretch(0)
    sizePolicy.setHeightForWidth(MainWindow.sizePolicy().hasHeightForWidth())
    MainWindow.setSizePolicy(sizePolicy)
    self.centralwidget = QtWidgets.QWidget(MainWindow)
    self.centralwidget.setObjectName("centralwidget")
    self.pushButton = QtWidgets.QPushButton(self.centralwidget)
    self.pushButton.setGeometry(QtCore.QRect(120, 130, 75, 23))
    self.pushButton.setObjectName("pushButton")
    self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
    self.pushButton_2.setGeometry(QtCore.QRect(280, 140, 75, 23))
    self.pushButton_2.setObjectName("pushButton_2")
    MainWindow.setCentralWidget(self.centralwidget)
    self.menubar = QtWidgets.QMenuBar(MainWindow)
    self.menubar.setGeometry(QtCore.QRect(0, 0, 1264, 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.close)
    self.pushButton_2.clicked.connect(MainWindow.quitApp)
    QtCore.QMetaObject.connectSlotsByName(MainWindow)

  def retranslateUi(self, MainWindow):
    _translate = QtCore.QCoreApplication.translate
    MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
    self.pushButton.setText(_translate("MainWindow", "PushButton"))
    self.pushButton_2.setText(_translate("MainWindow", "PushButton"))

# 使用一个按钮触发该槽函数，用于获取当前窗口的位置和尺寸
def getSizeOfMainWin(self):
  # 窗口左上角所在坐标
  print(self.x()) # 100
  print(self.y()) # 100
  # 整个窗口的宽和高
  print(self.width()) # 1264
  print(self.height()) # 886
  # 可用区域左上角所在坐标
  print(self.geometry().x()) # 101，说明可用区域左边有一个1px的边框
  print(self.geometry().y()) # 131，说明窗口上面的标题栏为31px（包含1px边框）
  # 整个窗口的宽和高，与self.width()、self.height()相同
  print(self.geometry().width()) # 1264
  print(self.geometry().height()) # 886

class MyWindow(QMainWindow):
  def __init__(self):
    super(MyWindow, self).__init__()
    self.initUI()

  def initUI(self):
    self.setWindowIcon(QIcon("icon.ico"))

if __name__ == '__main__':
  # 创建一个App实例
  app = QApplication(sys.argv)
  app.setWindowIcon(QIcon("icon.ico"))
  
  # 创建一个主窗口
  mainWin = MyWindow()
  # 使用我们生成的UI窗口实例
  ui = Ui_MainWindow()
  # 将主窗口传递进去，让Ui_MainWindow帮我们向主窗口上放置组件
  ui.setupUi(mainWin)
  # 显示
  mainWin.show()
  # 主循环
  sys.exit(app.exec_())