5. PyQt6 菜单栏

import sys
from PyQt6.QtWidgets import QApplication, QMainWindow
from PyQt6.QtGui import QGuiApplication, QAction, QIcon


class App(QMainWindow):

    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle("PyQt6 窗口案例")

        exitAct = QAction(QIcon("exit.png"), "&退出", self)
        exitAct.setShortcut("Ctrl+Q")
        exitAct.setStatusTip("退出应用")
        exitAct.triggered.connect(QApplication.instance().quit)

        self.statusBar()
        menubar = self.menuBar()
        file_menu = menubar.addMenu("文件")
        file_menu.addAction(exitAct)

        self.setGeometry(100, 100, 400, 300)
        self.center()

    def center(self):
        qr = self.frameGeometry()
        cp = QGuiApplication.primaryScreen().availableGeometry().center()
        qr.moveCenter(cp)
        self.move(qr.topLeft())


if __name__ == "__main__":
    app = QApplication(sys.argv)
    cls_app = App()
    cls_app.show()
    sys.exit(app.exec())