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我有一个 QComboBox, cbo_box, 嵌套在一个框架中, self.ui.frameFilterControls, 带有: cbo_box.currentTextChanged.connect(self.choice_changed). 在self.choice_changed()中，我调用一个函数来清除框架布局，包括cbo_box，然后使用适当的控件（包括新的cbo_box）重新生成布局：

layout = self.ui.frameFilterControls.layout()
if layout is not None:
    #clear layout
    for i in reversed(range(layout.count())):
        layout.itemAt(i).widget().setParent(None)

我遇到的问题是，当self.choice_changed()返回时，它会引发 SIGSEGV 错误：

Process finished with exit code 139 (interrupted by signal 11: SIGSEGV)

我猜是因为它无处可归，但我不确定。我想知道是否有可能代替调用删除和重新创建控件的函数，on_change如果cbo_box我可以安排它在下一次表单更新时进行评估，或者类似的事情？

编辑：

我制作了一个重现该行为的最小示例。

from PySide6 import QtCore, QtWidgets
from PySide6.QtWidgets import (QApplication, QListWidgetItem, QGridLayout, QVBoxLayout, QLineEdit, QComboBox)
import sys

#from output of designer -> simple main form with a frame for a starting point
class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(381, 357)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
        self.verticalLayout.setObjectName("verticalLayout")
        self.frame = QtWidgets.QFrame(self.centralwidget)
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        self.verticalLayout_2 = QtWidgets.QVBoxLayout(self.frame)
        self.verticalLayout_2.setObjectName("verticalLayout_2")
        self.pushButton = QtWidgets.QPushButton(self.frame)
        self.pushButton.setObjectName("pushButton")
        self.verticalLayout_2.addWidget(self.pushButton)
        self.verticalLayout.addWidget(self.frame)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 381, 22))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "PushButton"))


class MainGUI(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(MainGUI, self).__init__(parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        self.set_frame_controls()

    def set_frame_controls(self):
        layout = self.ui.frame.layout()
        if layout is not None:
            #clear layout
            for i in reversed(range(layout.count())):
                layout.itemAt(i).widget().setParent(None)

        cbo_box = QComboBox()
        cbo_box.addItem("test 1")
        cbo_box.addItem("test 2")
        cbo_box.currentTextChanged.connect(self.choice_changed)
        layout.addWidget(cbo_box)

    def choice_changed(self):
        print("choice_changed")
        cbo_box = self.sender()
        self.set_frame_controls()
        print("end choice changed")

def main():
    app = QApplication(sys.argv)
    form = MainGUI()
    form.show()
    app.exit(app.exec_())

if __name__ == '__main__':
    main()

当我运行上述程序并将组合框从“test 1”切换到“test 2”时，控制台输出如下：

choice_changed
end choice changed

Process finished with exit code 139 (interrupted by signal 11: SIGSEGV)

我想要的行为是完全重新生成框架，而不会出现错误。谢谢！

4

1 回答 1

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如果要从布局中删除小部件，仅设置 null 父级是不够的，因为这不会将其从布局所具有的内部列表中删除，而只会删除导致 SIGSEGV的deleteLater()相反，如果它确保正确消除元素（例如布局的内部列表），则必须使用which。

def set_frame_controls(self):
    layout = self.ui.frame.layout()
    if layout is not None:
        for i in reversed(range(layout.count())):
            widget = layout.itemAt(i).widget()
            if widget is not None:
                widget.deleteLater()

    cbo_box = QComboBox()
    cbo_box.addItem("test 1")
    cbo_box.addItem("test 2")
    cbo_box.currentTextChanged.connect(self.choice_changed)
    layout.addWidget(cbo_box)
于 2020-12-31T15:30:38.970 回答