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QApplication a(argc, argv);
auto id = QFontDatabase::addApplicationFont(":/bahnschrift.ttf");
QString family = QFontDatabase::applicationFontFamilies(id).at(0);
qDebug() << family;
QFont font("Bahnschrift");или через стиль
ui->pushButton->setFont(font);
<property name="styleSheet">или так
<string notr="true">font-family: "Bahnschrift";</string>
</property>
ui->pushButton->setStyleSheet(R"(
font-family: "Bahnschrift"
)");
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