About mainwindows layout problem(segmentation fault)

[kenchan]

i want to implement below function:

mainwindow have two widget(A is stackwidget and B is QFrame).

1. at first A is showed.
2. when click QAction action_B, A is hided, B is showed.
3. when click QAction action_A, A is showed, B is hided.

when debugger.
At first click action_A, can show A and hide B, but segmentation fault when i cllick action_B.

i delete this->setCentralWidget(A) or this->setCentralWidget(B) , no fault was happened.

if i want to implement function above what i said. how to program? please give me any advice. thank your for your help!


codes see as below:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    ...............
    this->setCentralWidget(A);
}
 
void MainWindow::init();
{
    ui->action_A->setEnabled(true);
    ui->action_B->setEnabled(false);
 
   a->hide();
   ..........
   this->setCentralWidget(B);
   b->show();
}
 
void MainWindow::on_action_A_triggered()
{
    b->hide();
    a->show();
    ui->action_A->setEnabled(false);
    ui->action_B->setEnabled(true);
    ......
}
 
void MainWindow::on_action_B_triggered()
{
    init();
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    ...............
    this->setCentralWidget(A);
}

void MainWindow::init();
{
    ui->action_A->setEnabled(true);
    ui->action_B->setEnabled(false);

   a->hide();
   ..........
   this->setCentralWidget(B);
   b->show();
}

void MainWindow::on_action_A_triggered()
{
    b->hide();
    a->show();
    ui->action_A->setEnabled(false);
    ui->action_B->setEnabled(true);
    ......
}

void MainWindow::on_action_B_triggered()
{
    init();
}

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TKS.

ken