QT5.4删除和删除布局中的小部件 [英] QT5.4 remove and delete widget in a layout

问题描述

我有一个QStackedLayout，上面只有几个QWidget.窗口小部件布局为QVBoxLayout，其中也只有几个QPushButton.我想做的是删除QStackedLayout内的所有小部件，然后删除小部件和布局但我希望不要删除所有按钮，因为稍后我会将它们放到另一个小部件中

I have a QStackedLayout which contains few QWidget on it. The widgets layout is QVBoxLayout which have also few QPushButton. What I wanted to do is to remove all the widgets inside the QStackedLayout and then delete the widgets and layouts BUT I want all the buttons not to be deleted 'cause I will put them to another widget later.

这是我的代码:

while (QLayoutItem *item = m_stacked_layout->takeAt(0)) {
    QWidget *w = item->widget();

    for (int i = 0; i < w->layout()->count(); i++) {
        QPushButton *button = qobject_cast<QPushButton *>(w->layout()->itemAt(i)->widget());
        if (button) {
            w->layout()->removeWidget(button);
        }
    }

    delete w;
    delete item;
}

应用程序在delete w;行崩溃.而且，如果我删除delete行，则应用程序可以正常运行.

The application crashes at the line delete w;. And, if I remove the delete lines, application works fine.

推荐答案

但是我不想删除所有按钮，因为我会将它们放到 稍后再添加另一个小部件.

BUT I want all the buttons not to be deleted 'cause I will put them to another widget later.

1. 隐藏所有要传输的小部件
2. 将所有这些小部件的父小部件设置为nullptr
3. 稍后...设置必要的父项并显示小部件

注意:如果要删除某些插槽内的小部件，则应使用deleteLater方法.

Note: if you want to delete widgets inside some slots, you should use deleteLater method.

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