Qt显示QImage图像在label上,并保持自适应大小问题

        //将QImage的大小收缩或拉伸，与label的大小保持一致。这样label中能显示完整的图片
        QImage imageScale = image.scaled(QSize(ui->label_Pixmap->width(), 
        ui->label_Pixmap->height()));
        QPixmap pixmap = QPixmap::fromImage(imageScale);
        ui->label_Pixmap->setPixmap(pixmap);

//写在widget.cpp中
#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);

    //将Lable控件的名字取为lbl_image
    //Qt中的图片资源不叫picture，叫pixmap
    ui->lbl_image->setPixmap(QPixmap(":/image/1.jpg"));
}

Widget::~Widget()
{
    delete ui;
}

//写在widget.cpp中
#include "widget.h"
#include "ui_widget.h"
#include <QMovie>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);

    //将Lable控件的名字取为lbl_image
    QMovie * mmovie = new QMovie(":/image/2.gif");
    ui->lbl_movie->setMovie(mmovie);
    //动图得播放才有效果
    mmovie->start();
}

Widget::~Widget()
{
    delete ui;
}