解释：

1、封装内容：1个按钮画上两张图片（等级迭代）

2、参数：需要描述的等级

函数定义：

#include <QTimer>
#define LV_PNG				    "..."
#define LV_PNG_HEIGHT			7
#define LV_PNG_WIDTH			10#define LV_NUM_PNG				"..."
#define LV_NUM_HEIGHT			7
#define LV_NUM_WIDTH			6void initLevelButton();void drawLevelButton(int level);

源代码：

void CCMainWindow::initLevelButton()
{drawLevelButton(0);QTimer* timer = new QTimer(this);timer->setInterval(100);            //间隔毫秒connect(timer, &QTimer::timeout,    //循环响应开始[this]() {static int lv = 0;if (lv == 99) lv = 0;        //循环节点drawLevelButton(lv++);});timer->start();                    //时间开始}void CCMainWindow::drawLevelButton(int level)
{QPixmap pixmap(ui.levelBtn->size());	//画布pixmap.fill(Qt::transparent);QPainter p(&pixmap);	//笔int y = (ui.levelBtn->height() - LV_PNG_HEIGHT) / 2;p.drawPixmap(0, y, QPixmap(LV_PNG));int tenNum = level / 10;int unitNum = level % 10;QPixmap levelValue(LV_NUM_PNG);//绘制十位p.drawPixmap(LV_PNG_WIDTH, y, levelValue,	//在 LV 后面开始绘制tenNum*LV_NUM_WIDTH, 0,			//起点LV_NUM_WIDTH, LV_NUM_HEIGHT);	//终点(大小)//个位p.drawPixmap(LV_NUM_WIDTH + LV_PNG_WIDTH, y, levelValue,	//在 LV 十位数字 后面unitNum*LV_NUM_WIDTH, 0,			//起点LV_NUM_WIDTH, LV_NUM_HEIGHT);		//终点(大小)ui.levelBtn->setIcon(pixmap);ui.levelBtn->setIconSize(ui.levelBtn->size());
}