Qt Designer的使用

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1.界面与逻辑分离

首先利用Qt Designer设计.ui文件，然后采用Tools->External Tools->PyUIC转换成.py文件。这个.py文件是.ui文件编译而来的，将这种文件由.ui文件编译而来的.py文件称之为界面文件。由于界面文件每次编译时候都会初始化，所以需要新建一个.py文件来调用界面文件，这个新建立的.py问称之为逻辑文件，也可以成为业务文件。
界面文件和逻辑文件是两个相对独立的文件，通过上述方法实现了界面与逻辑的分离。
逻辑文件代码（自己写的代码）

import sys
from PyQt5.QtWidgets import QApplication,QMainWindow
from gyy_firstMain import *

class MyMainWindow(QMainWindow,Ui_MainWindow):
    def __init__(self,parent=None):
        super(MyMainWindow,self).__init__(parent)
        self.setupUi(self)

if __name__=="__main__":
    app = QApplication(sys.argv)
    myWin=MyMainWindow()
    myWin.show()
    sys.exit(app.exec_())

界面文件代码（通过.ui文件转换的代码）

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

# Form implementation generated from reading ui file 'gyy_firstMain.ui'
#
# Created by: PyQt5 UI code generator 5.15.4
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.


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(490, 110, 93, 28))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 26))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        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.信号与槽简单示例

窗口显示的代码

import sys
from PyQt5.QtWidgets import QApplication,QMainWindow
from gyy_MainWinSignalSlog01 import Ui_Form

class MyMainWindow(QMainWindow,Ui_Form):
    def __init__(self,parent=None):
        super(MyMainWindow,self).__init__(parent)
        self.setupUi(self)

if __name__=="__main__":
    app = QApplication(sys.argv)
    myWin = MyMainWindow()
    myWin.show()
    sys.exit(app.exec_())

业务逻辑分离的代码

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

# Form implementation generated from reading ui file 'gyy_MainWinSignalSlog01.ui'
#
# Created by: PyQt5 UI code generator 5.15.4
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.


from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(400, 300)
        self.closeWinBtn = QtWidgets.QPushButton(Form)
        self.closeWinBtn.setGeometry(QtCore.QRect(130, 90, 92, 28))
        self.closeWinBtn.setObjectName("closeWinBtn")

        self.retranslateUi(Form)
        self.closeWinBtn.clicked.connect(Form.close)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.closeWinBtn.setText(_translate("Form", "关闭窗口"))