单击单选按钮或在PyQt中更改数字显示框时，组合框索引值将恢复为默认值0

from PyQt5.QtWidgets import QApplication, QMainWindow, QComboBox, QRadioButton, QSpinBox, QVBoxLayout, QWidget

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        # 创建组件
        self.combo_box = QComboBox()
        self.radio_button = QRadioButton("单选按钮")
        self.spin_box = QSpinBox()

        # 设置默认值
        self.combo_box.addItem("选项1")
        self.combo_box.addItem("选项2")
        self.combo_box.addItem("选项3")

        # 连接信号与槽
        self.radio_button.clicked.connect(self.update_combo_box)
        self.spin_box.valueChanged.connect(self.update_combo_box)

        # 创建布局
        layout = QVBoxLayout()
        layout.addWidget(self.combo_box)
        layout.addWidget(self.radio_button)
        layout.addWidget(self.spin_box)

        # 创建主窗口
        widget = QWidget()
        widget.setLayout(layout)
        self.setCentralWidget(widget)

    def update_combo_box(self):
        # 更新组合框的索引值为默认值0
        self.combo_box.setCurrentIndex(0)

if __name__ == "__main__":
    app = QApplication([])
    window = MainWindow()
    window.show()
    app.exec_()