PySide设置两个窗口（主次窗口）

import sys
from PySide6.QtWidgets import QApplication, QMainWindow, QPushButton, QVBoxLayout, QWidget, QDialog, QLabel


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("主窗口")

        # 创建一个按钮，点击时打开第二个窗口
        button = QPushButton("打开第二个窗口")
        button.clicked.connect(self.open_second_window)

        # 设置布局
        layout = QVBoxLayout()
        layout.addWidget(button)
        central_widget = QWidget()
        central_widget.setLayout(layout)
        self.setCentralWidget(central_widget)

    def open_second_window(self):
        """打开第二个窗口"""
        dialog = SecondWindow(self)
        dialog.exec()


class SecondWindow(QDialog):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setWindowTitle("第二个窗口")
        label = QLabel("这是第二个窗口的内容")
        layout = QVBoxLayout()
        layout.addWidget(label)
        self.setLayout(layout)


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