#ifndef IMAGES_H
#define IMAGES_H
 
#include <QtWidgets/QMainWindow>
#include "ui_images.h"
#include <Qlabel>
#include <qpushbutton.h>
#include <qpixmap.h>
#include <qstring.h>
#include <qtimer.h>
 
class images : public QMainWindow
{
 Q_OBJECT
 
public:
 images(QWidget *parent=0);
 ~images();
 
private:
 Ui::imagesClass ui;
 QTimer *qTimer;
 int imgNumber;
private slots:
 //顯示圖片
 void showPictureSlot();
 
};
 
#endif // IMAGES_H

#include "images.h"
#pragma execution_character_set("utf-8")
 
images::images(QWidget *parent)
 : QMainWindow(parent), imgNumber(0)
{
 ui.setupUi(this);
 //修改標(biāo)題
 this->setWindowTitle("QLabel的顯示圖片程序:");
 
 //給label設(shè)置新的文本
 ui.picture_label->setText("未顯示圖片");
 //將label框的內(nèi)容位于中間.
 ui.picture_label->setAlignment(Qt::AlignCenter | Qt::AlignHCenter);
 
 
 //設(shè)置label框自動填充
 //ui.picture_label->setScaledContents(true);
 
 //連接信號 與 槽
 connect(ui.pushButton, SIGNAL(clicked()), this, SLOT(showPictureSlot()));
 
 
 ui.picture_label->setScaledContents(true);
 
 qTimer = new QTimer();
 
 connect(this->qTimer, SIGNAL(timeout()), this, SLOT(showPictureSlot()));
 
 qTimer->start(3000);
}
 
images::~images()
{
 delete qTimer;
}
//顯示圖片
void images::showPictureSlot(){
 ++imgNumber;
    //圖片路徑(絕對路徑拼接)
 QString path = ":/File/Resources/" + QString::number(imgNumber) + ".png";
 QPixmap pixmap(path);
 
 pixmap.scaled(ui.picture_label->size(), Qt::KeepAspectRatio);
 
 ui.picture_label->setPixmap(pixmap);
 
 if (3 == imgNumber)
 {
 imgNumber = 0;
 }
}