在界面的类中写:
class ImageProcess: public QMainWindow
{
Q_OBJECT
public:
explicit ImageProcess(QWidget *parent = 0);
~ImageProcess();
...
private:
...
protected:
void resizeEvent(QResizeEvent *event);
}
在构造函数中写：
void ImageProcess::resizeEvent(QResizeEvent *event)
{
label_name->setFixedSize(event->size()/2);
//size大小根据自己的需求设置
QWidget::resizeEvent(event);
}