QML is a declarative UI markup language with javascript scripting. Are there really any parallels to Swift? I haven't looked at it in any detail before.
True that Qt is a full C++ framework (my bad on that, i should know i use it everyday), but swift is nothing like QML.
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.
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.