QGraphicScene Pop一秒鐘然後消失

Question

我有我的所有代碼在一個mainWindow的構造函數。問題在於顯示器只彈出一秒鐘而消失。任何幫助都感激不盡 。以下是代碼。

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

您已在棧上創建場景並且未將其分配給成員變量，因此一旦控件離開構造函數，它將被刪除。