How to set Qt window screen center display and size

How to set the center display and size of Qt

Set the window to center

Method 1: add the following code to the constructor of the window (QWidget class and derived class) :

#include <QDesktopWidget>
 
//.......
QDesktopWidget* desktop = QApplication::desktop(); // =qApp->desktop(); Can also be 
move((desktop->width() - this->width())/2, (desktop->height() - this->height())/2);
//.......

Method 2: call move() after calling show(), which moves the window to the center of the screen.

move ((QApplication::desktop()->width() - w.width())/2,
(QApplication::desktop()->height() - w.height())/2);

Set the size of the case used

resize ( int width int height ) ;

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