I wonder what this will mean for Qt and QML.
The purpose and syntax of QML and Swift are similar, too.
PS: Qt is not only a GUI framework. It's a cross platform C++ framework.
I would say though that QML + javascript fills a similar purpose as Swift.
QML is just a markup language that is interpreted by an engine written in C++, swift is a whole programming language that is compiled. It would be more fitting to compare C++ and swift than swift and Qt.