登录对话框PyQt

import sys
from PyQt5.QtWidgets import QApplication, QDialog, QVBoxLayout, QLabel, QLineEdit, QPushButton

class LoginDialog(QDialog):
    def __init__(self):
        super().__init__()

        self.initUI()

    def initUI(self):
        self.setWindowTitle('登录')

        layout = QVBoxLayout()

        label1 = QLabel('用户名:')
        self.username_edit = QLineEdit()
        layout.addWidget(label1)
        layout.addWidget(self.username_edit)

        label2 = QLabel('密码:')
        self.password_edit = QLineEdit()
        self.password_edit.setEchoMode(QLineEdit.Password)
        layout.addWidget(label2)
        layout.addWidget(self.password_edit)

        ok_button = QPushButton('确定')
        ok_button.clicked.connect(self.on_ok_clicked)
        cancel_button = QPushButton('取消')
        cancel_button.clicked.connect(self.on_cancel_clicked)

        layout.addWidget(ok_button)
        layout.addWidget(cancel_button)

        self.setLayout(layout)

    def on_ok_clicked(self):
        username = self.username_edit.text()
        password = self.password_edit.text()

        # 在这里添加验证用户名和密码的代码

        self.accept()

    def on_cancel_clicked(self):
        self.reject()

app = QApplication(sys.argv)
dialog = LoginDialog()
result = dialog.exec_()

if result == QDialog.Accepted:
    print('登录成功')
else:
    print('登录取消')