Qt 代码： QComboBox 添加图片

方法：
    使用 QComboxBox::addItem(QIcon, QString);


示例：

QComboBox *combo_status = new QComboBox(this);

QIcon  onlineIcon (":/icon/online.png");
QIcon leaveIcon  (":/icon/leave.png");
QIcon rejectIcon (":/icon/reject.png");
QIcon hideIcon   (":/icon/hide.png");
QIcon offlineIcon(":/icon/offline.png");

combo_status->addItem(onlineIcon,"在线");
combo_status->addItem(leaveIcon,"离开");
combo_status->addItem(rejectIcon,"勿扰");
combo_status->addItem(hideIcon,"隐身");
combo_status->addItem(offlineIcon,"离线");