【Python-GUI】pyside2/pyqt5两个窗口界面数据传递

本文通过login界面登录成功后弹出main界面，点击发送数据按钮将用用户名传递给main界面。main界面通过返回数据按钮将数据返回到login界面

登录界面代码login.py

#-*- coding: utf-8 -*-
from PySide2.QtWidgets import *
from PySide2.QtGui import *
from PySide2.QtUiTools import *
from PySide2.QtCore import *
from pyside2_demo.main import *

class Login(QWidget):
    signal_1 = Signal(str) #定义信号

    def __init__(self):
        super(Login,self).__init__()
        self.ui = QUiLoader().load('ui/pyside2_login.ui')
        self.ui.loginButton.clicked.connect(self.login_button)
        self.ui.sendButton.clicked.connect(self.send_data)
        self.main = Main()  #实例化子窗口
        self.signal_1.connect(self.main.get_data) #将登录窗口和子窗口绑定

    def login_button(self):
        user = self.ui.usernameEdit.text()
        passwd = self.ui.passwordEdit.text()
        if user == 'admin' and passwd =='1234':
            self.main.ui.show()  #展示main子窗口
            self.main.signal_2.connect(self.get_main_data) #将子窗口和登录窗口绑定用来获取返回数据
        else:
            QMessageBox.warning(self.ui,'提示','账号密码错误')

    def send_data(self):
        self.signal_1.emit(self.ui.usernameEdit.text()) #Login发送信号

    def get_main_data(self,returndata):
        self.ui.loginfo.setPlainText(returndata) #接收子窗口main返回的数据

if __name__ == '__main__':
    app = QApplication([])
    stats = Login()
    stats.ui.show()
    app.exec_()

第2个窗口代码main.py

#-*- coding: utf-8 -*-
from PySide2.QtWidgets import *
from PySide2.QtCore import *
from PySide2.QtUiTools import *
from PySide2.QtGui import *

class Main(QDialog):
    signal_2 = Signal(str) #自定义信号2 用于返回数据给登录窗口
    def __init__(self):
        super(Main,self).__init__()
        self.ui = QUiLoader().load('ui/main.ui')
        self.ui.button_001.clicked.connect(self.return_data)

    def return_data(self):
        self.signal_2.emit(self.ui.lineEdit_001.text()) #发送返回数据信号

    def get_data(self,para):
        self.ui.lineEdit_001.setText(para) #接收到login发送过来的数据

if __name__ == '__main__':
    app = QApplication([])
    stats = Main()
    stats.ui.show()
    app.exec_()