QGraphicScene 弹出窗口一秒钟然后消失

Question

我在主窗口的构造函数中有一个我所有的代码。问题是显示屏只弹出一秒钟，然后消失。任何帮助将不胜感激。以下是代码。

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent)
{
QPixmap kineticPix(":/images/kinetic.png");
QPixmap bgPix(":/images/Time-For-Lunch-2.jpg");
QGraphicsScene scene(-350, -350, 700, 700);
QGraphicsItem *buttonParent = new QGraphicsRectItem;
Button *ellipseButton = new Button(QPixmap(":/images/ellipse.png"), buttonParent);
Button *figure8Button = new Button(QPixmap(":/images/figure8.png"), buttonParent);
Button *randomButton = new Button(QPixmap(":/images/random.png"), buttonParent);
Button *tiledButton = new Button(QPixmap(":/images/tile.png"), buttonParent);
Button *centeredButton = new Button(QPixmap(":/images/centered.png"), buttonParent);
ellipseButton->setPos(-100, -100);
figure8Button->setPos(100, -100);
randomButton->setPos(0, 0);
tiledButton->setPos(-100, 100);
centeredButton->setPos(100, 100);
scene.addItem(buttonParent);
buttonParent->scale(0.75, 0.75);
buttonParent->setPos(200, 200);
buttonParent->setZValue(65);

}

Answer 1

您已在堆栈上创建了场景，但尚未将其分配给成员变量，因此一旦控件离开构造函数，它就会被删除。