Qt 窗口居中显示

#include <QDesktopWidget>
// 主屏幕居中显示        
QDesktopWidget* desktop = QApplication::desktop();
QWidget* mainScreen = desktop->screen(0);
move((mainScreen->width() - this->width()) / 2, (mainScreen->height() - this->height()) / 2); // this 是要显示的窗口的指针.