qt - QWidget::setLayout 错误:正在尝试设置已经有布局的 QLayout [...]

Question

执行时(没有编译错误)我进入控制台

QWidget::setLayout: Attempting to set QLayout "" on CGSearchResult "", which already has a layout

我正在使用以下代码:

CGSearchResult::CGSearchResult(QWidget *parent) : QWidget(parent)
{

    initControls();
    SetTableContent();

}

void CGSearchResult::initControls()
{


   backButton = new QPushButton(tr("&Back"));
   connect(backButton, SIGNAL(clicked()), this, SLOT(showHome()));

   model=new QStandardItemModel();


         QWidget::setFont(QFont("Courier New", 8, QFont::Bold));

        searchTable = new QTableView(this);
        searchTable->showGrid();

        searchTable->resize(720,400);
        searchTable->horizontalHeader()->setDefaultSectionSize(170);
        searchTable->verticalHeader()->setDefaultSectionSize(50);
        searchTable->verticalHeader()->hide();
        searchTable->horizontalHeader()->setResizeMode(QHeaderView::Fixed);
        searchTable->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);


    QGridLayout *layout = new QGridLayout();
    layout->addWidget(backButton, 0, 0, 1, 1);
    layout->addWidget(searchTable, 2, 0, 1, 1);

    setLayout(layout);


}

Answer 1

http://qt-project.org/doc/qt-4.8/qwidget.html#setLayout

If there already is a layout manager installed on this widget, QWidget won't let you install another. You must first delete the existing layout manager (returned by layout()) before you can call setLayout() with the new layout.