加载外部字体，但是会稍微影响开启速度。

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#include <QApplication>
#include <QStyleFactory>
#include <QFontDataBase>
#include <QIODevice>

QString loadFontFamilyFromFiles(const QString &fontFilePath)
{
    QString font = "";

    QFile fontFile(fontFilePath);
    if(!fontFile.open(QIODevice::ReadOnly))
    {
        qDebug()<<"Open font file error";
        return font;
    }

    int loadedFontID = QFontDatabase::addApplicationFontFromData(fontFile.readAll());
    QStringList loadedFontFamilies = QFontDatabase::applicationFontFamilies(loadedFontID);
    if(!loadedFontFamilies.empty())
    {
        font = loadedFontFamilies.at(0);
    }
    fontFile.close();
    return font;
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QString font_path = "字体路径（ttf/otf）";
    if (isFileExist(font_path))
    {
        QString strFont =  loadFontFamilyFromFiles(font_path);
        QFont font(strFont, 9);
        a.setFont(font);
    }

    MainWindow w;
    w.show();

    return a.exec();
};