qt designer入门

由ui文件转化而来的py文件：

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

# Form implementation generated from reading ui file 'untitled.ui'
#
# Created by: PyQt5 UI code generator 5.15.2
#
# 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.lineEdit = QtWidgets.QLineEdit(Form)
        self.lineEdit.setGeometry(QtCore.QRect(160, 50, 181, 21))
        self.lineEdit.setObjectName("lineEdit")
        self.textEdit = QtWidgets.QTextEdit(Form)
        self.textEdit.setGeometry(QtCore.QRect(160, 90, 181, 87))
        self.textEdit.setObjectName("textEdit")
        self.label = QtWidgets.QLabel(Form)
        self.label.setGeometry(QtCore.QRect(80, 50, 72, 15))
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(Form)
        self.label_2.setGeometry(QtCore.QRect(80, 100, 72, 15))
        self.label_2.setObjectName("label_2")
        self.pushButton = QtWidgets.QPushButton(Form)
        self.pushButton.setGeometry(QtCore.QRect(140, 230, 93, 28))
        self.pushButton.setObjectName("pushButton")

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.label.setText(_translate("Form", "输入姓名"))
        self.label_2.setText(_translate("Form", "信息"))
        self.pushButton.setText(_translate("Form", "确定"))

和

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

# Form implementation generated from reading ui file 'subwindow.ui'
#
# Created by: PyQt5 UI code generator 5.15.2
#
# 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.textEdit = QtWidgets.QTextEdit(Form)
        self.textEdit.setGeometry(QtCore.QRect(90, 80, 171, 121))
        self.textEdit.setObjectName("textEdit")

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))

主文件(示例了主窗口如何调用子窗口，以及为按钮设计和关联相应的函数）

import mainwindow
import PyQt5.QtWidgets as QtWidgets
import subwindow

class Subwindow(QtWidgets.QDialog, subwindow.Ui_Form):            #子窗口必须继承自QDialog类
    def __init__(self, parent=None):
        super(Subwindow,self).__init__(parent)
        self.setupUi(self)
        self.parent=parent
        self.textEdit.setText(self.parent.lineEdit.text())
        print(self.parent.lineEdit.text())                        #子窗口获取主窗口数据

class Mwindow(QtWidgets.QWidget, mainwindow.Ui_Form):
    def __init__(self):
        super(Mwindow, self).__init__()
        self.setupUi(self)
        self.pushButton.clicked.connect(self.print)              #按钮和函数关联
        self.subwindow=None

    def print(self):                                             #主窗口编写函数
        self.lineEdit.setText('tom')
        self.textEdit.setText('age:22\nsex:man\nschool:ustc\n')
        self.subwindow=Subwindow(self)
        self.subwindow.show()                                    #显示子窗口

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = Mwindow()
    w.show()
    sys.exit(app.exec_())