例如下面的代码,我想把窗口初始设置成屏幕的0.9大小,然后随意缩放,
但是不起作用,窗口还是qt creator设计时那么大
this->resize(QSize((QApplication::desktop()->width()) * 0.9, (QApplication::desktop()->height()) * 0.9));
this->adjustSize();
this->setGeometry ((QApplication::desktop()->width() - this->width()) / 2, (QApplication::desktop()->height() - this->height()) / 2, this->width(), this->height());
如果用
this->setFixedSize((QApplication::desktop()->width()) * 0.9, (QApplication::desktop()->height()) * 0.9);
则窗口不能缩放
请问该咋整,多谢