11. PyQt6 QHBoxLayout

import sys
from PyQt6.QtWidgets import QApplication, QMainWindow, QHBoxLayout, QVBoxLayout, QPushButton, QWidget
from PyQt6.QtGui import QGuiApplication


class App(QMainWindow):

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

    def initUI(self):
        self.setWindowTitle("PyQt6 QHBoxLayout")
        ok_button = QPushButton("确定")
        cancel_button = QPushButton("取消")

        hbox = QHBoxLayout()
        hbox.addStretch(1)
        hbox.addWidget(ok_button)
        hbox.addWidget(cancel_button)

        vbox = QVBoxLayout()
        vbox.addStretch(1)
        vbox.addLayout(hbox)

        w = QWidget()
        w.setLayout(vbox)
        self.setCentralWidget(w)
        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())