QStringList FontList;
FontList.clear();
int lcdFontId = QFontDatabase::addApplicationFont(QString::fromLocal8Bit(":/PingFang Medium.ttf")); // 从source资源文件
if (lcdFontId != -1) // -1为加载失败
{
FontList << QFontDatabase::applicationFontFamilies(lcdFontId);
}
QFont font;
font.setFamily(FontList .at(0));