如何访问子类中的小部件?

我已经创建了 QLineEdit 我在小部件的右侧添加了一个按钮,这样我就可以 一体机 路径浏览控件。但是,我需要从 resizeEvent ,这样我就可以将按钮正确地放置在行编辑的右侧。我得到错误,我假设这是由于我创建按钮的方式。

线条编辑路径.h

#ifndef LINEEDITPATH_H
#define LINEEDITPATH_H

#include <QLineEdit>
#include <QFileDialog>
#include <QPushButton>

class LineEditPath : public QLineEdit
{
    Q_OBJECT
public:
    explicit LineEditPath(QWidget *parent = 0);

signals:

public slots:

protected:
    void resizeEvent(QResizeEvent *event) override;

private:
    QFileDialog *dialog;
    QPushButton *button;
};

#endif // LINEEDITPATH_H

lineedithpath.cpp文件

#include "lineeditpath.h"
#include <QLineEdit>
#include <QPushButton>

LineEditPath::LineEditPath(QWidget *parent) : QLineEdit(parent) {
    setAcceptDrops(true);

    auto button = new QPushButton("...", this);
    button->setFixedWidth(30);
    button->setCursor(Qt::CursorShape::PointingHandCursor);
    button->setFocusPolicy(Qt::FocusPolicy::NoFocus);
    setTextMargins(0,0,30,0); }

void LineEditPath::resizeEvent(QResizeEvent *event) {
    QLineEdit::resizeEvent(event);

    // Resize the button: ERROR
    button->move(width()-button->sizeHint().width(), 0);

}

错误:

---------------------------
Signal Received
---------------------------
<p>The inferior stopped because it received a signal from the operating system.<p><table><tr><td>Signal name : </td><td>SIGSEGV</td></tr><tr><td>Signal meaning : </td><td>Segmentation fault</td></tr></table>
---------------------------
OK   
---------------------------