PyQt5设计登录跳转界面

PyQt5登录跳转界面设计

import sys
from PyQt5.QtCore import pyqtSignal
from PyQt5.QtWidgets import QApplication, QMainWindow, QDialog, QVBoxLayout, QLabel, QLineEdit, QPushButton, QWidget, \QFormLayout, QMessageBox, QSpacerItem, QSizePolicyclass LoginDialog(QDialog):  #登录界面dialogdialog_signal=pyqtSignal(bool)def __init__(self, parent=None):super(LoginDialog, self).__init__(parent)self.setWindowTitle('登录')self.initUI()self.resize(400, 400)def initUI(self):layout = QVBoxLayout()self.username_label = QLabel('用户名:')self.username_input = QLineEdit()self.vspacer = QSpacerItem(50, 50, QSizePolicy.Minimum, QSizePolicy.Expanding) #QSpacerItem 接受四个参数：宽度、高度、水平尺寸策略和垂直尺寸策略。QSizePolicy.Expanding 确保弹簧会尽可能地扩展。layout.addSpacerItem(self.vspacer)layout.addWidget(self.username_label)layout.addWidget(self.username_input)self.password_label = QLabel('密码:')self.password_input = QLineEdit()self.password_input.setEchoMode(QLineEdit.Password)layout.addWidget(self.password_label)layout.addWidget(self.password_input)layout.addSpacerItem(self.vspacer)self.login_button = QPushButton('登录')self.login_button.clicked.connect(self.on_login)layout.addWidget(self.login_button)layout.addSpacerItem(self.vspacer)self.setLayout(layout)def on_login(self):username = self.username_input.text()password = self.password_input.text()# 这里只是简单模拟，实际中你需要连接数据库或其他认证系统if username == 'admin' and password == '1':self.dialog_signal.emit(True)  # 如果登录成功，发送True信号else:self.dialog_signal.emit(False)  # 如果登录失败，发送False信号class MainWindow(QMainWindow):  # 登录成功后显示的主界面def __init__(self, parent=None):super(MainWindow, self).__init__(parent)self.setWindowTitle('主页面')self.Page1=Page1Dialog(self) #跳转的界面1self.Page2=Page2Dialog(self) #跳转的界面2self.initUI()self.resize(400, 400)def initUI(self):# 在这里添加主页面的UI元素self.page1_btn = QPushButton('界面1')self.page1_btn.clicked.connect(self.page1_btn_clicked)self.page2_btn = QPushButton('界面2')self.page2_btn.clicked.connect(self.page2_btn_clicked)self.vbox = QVBoxLayout()self.vbox.addWidget(self.page1_btn)self.vbox.addWidget(self.page2_btn)widGet = QWidget()widGet.setLayout(self.vbox)self.setCentralWidget(widGet)def page1_btn_clicked(self): #点击界面1按钮触发界面1显示self.Page1.show()def page2_btn_clicked(self): #点击界面2按钮触发界面2显示self.Page2.show()class Page1Dialog(QDialog): #界面1设计def __init__(self, parent=None):super(QDialog, self).__init__(parent)self.setWindowTitle('界面1')self.initUI()self.resize(400, 400)def initUI(self):# 在这里添加主页面的UI元素self.line_input = QLineEdit()self.line_output = QLineEdit()self.label_input = QLabel('输入')self.line_input.textChanged.connect(self.line_output_getValue)self.label_output = QLabel('输出')gridlayout_input = QFormLayout()gridlayout_output = QFormLayout()gridlayout_input.addRow(self.label_input, self.line_input)gridlayout_output.addRow(self.label_output, self.line_output)self.vbox=QVBoxLayout()self.vbox.addLayout(gridlayout_input)self.vbox.addLayout(gridlayout_output)self.setLayout(self.vbox)def line_output_getValue(self):self.line_output.setText(self.line_input.text())class Page2Dialog(QDialog): #界面2设计def __init__(self, parent=None):super(QDialog, self).__init__(parent)self.setWindowTitle('界面2')self.initUI()self.resize(400, 400)def initUI(self):# 在这里添加主页面的UI元素self.line_input = QLineEdit()self.line_input.textChanged.connect(self.line_output_getValue)self.line_output = QLineEdit()self.label_input = QLabel('输入')self.label_output = QLabel('输出')gridlayout_input = QFormLayout()gridlayout_output = QFormLayout()gridlayout_input.addRow(self.label_input, self.line_input)gridlayout_output.addRow(self.label_output, self.line_output)self.vbox=QVBoxLayout()self.vbox.addLayout(gridlayout_input)self.vbox.addLayout(gridlayout_output)self.setLayout(self.vbox)def line_output_getValue(self):self.line_output.setText(self.line_input.text())class App(QApplication):def __init__(self, sys_argv):super(App, self).__init__(sys_argv)self.main_window = MainWindow()self.login_dialog = LoginDialog()self.login_dialog.dialog_signal.connect(self.on_login_finished)self.login_dialog.show()def on_login_finished(self, result): #点击登录后执行的函数，该函数与登录界面的dialog_signal信号绑定，接收来自登录界面点击登录按钮后发送的bool值信号if result:  # 如果登录成功（即接收到True信号）self.login_dialog.close() #关闭登录界面self.main_window.show() #显示登录后的主界面else:  # 如果登录失败（即接收到False信号）QMessageBox.critical(None, '错误提示', '账号或密码输入错误', QMessageBox.Ok) #弹出密码验证失败提示框if __name__ == '__main__':app = App(sys.argv)sys.exit(app.exec_())

程序运行截图