1. 效果

2. 代码

2.1 头文件

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
    void initGif(QString prefix, int sumCnt);
    void start();
    void stop();

private:
    Ui::Widget *ui;
    int curIndex;
    QString prefix;
    int sumCnt;
    int timeID;

    // QObject interface
protected:
    void timerEvent(QTimerEvent *event) override;
};
#endif // WIDGET_H

2.2 cpp文件

#include "widget.h"
#include "ui_widget.h"

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

	//资源文件:/img/p1 ~ :/img/p11
    initGif(":/img/p", 11);
    start();
}

Widget::~Widget()
{
    delete ui;
}

void Widget::initGif(QString prefix, int sumCnt)
{
    this->prefix = prefix;
    this->sumCnt = sumCnt;

    //QString(this->prefix+%1.png").arg("10");
    QString fileName = this->prefix + "1" + ".png";
    ui->label->setPixmap(QPixmap(fileName));
}

void Widget::start()
{
    timeID = startTimer(100);

}

void Widget::stop()
{
    killTimer(timeID);
    QString fileName = this->prefix + "1" + ".png";
    ui->label->setPixmap(QPixmap(fileName));
}

void Widget::timerEvent(QTimerEvent *event)
{
    curIndex++;
    if(curIndex > this->sumCnt)
        curIndex = 1;

    QString fileName = this->prefix + QString("%1.png").arg(QString::number(curIndex));
    ui->label->setPixmap(QPixmap(fileName));
}

3. 参考

QT：利用计时器连续播放图片组成动图效果